Abstract:
Spinach, parts thereof, and the making and use thereof, including with respect to the inbred spinach line called SP6504 are disclosed.

Description:
RELATED APPLICATIONS AND INCORPORATION BY REFERENCE 
       [0001]    This application claims priority to U.S. provisional patent application Ser. No. 61/412,576 filed Nov. 11, 2010. 
         [0002]    The foregoing applications, and all documents cited therein or during their prosecution (“appln cited documents”) and all documents cited or referenced in the appln cited documents, and all documents cited or referenced herein (“herein cited documents”), and all documents cited or referenced in herein cited documents, together with any manufacturer&#39;s instructions, descriptions, product specifications, and product sheets for any products mentioned herein or in any document incorporated by reference herein, are hereby incorporated herein by reference, and may be employed in the practice of the invention. More specifically, all referenced documents are incorporated by reference to the same extent as if each individual document was specifically and individually indicated to be incorporated by reference. 
     
    
     FIELD OF THE INVENTION 
       [0003]    The present invention relates to the field of plant breeding and more particular to the development of inbred spinach line SP6504. 
       BACKGROUND OF THE INVENTION 
       [0004]    Spinach ( Spinacia oleracea ) is a flowering vegetable plant in the family of Amaranthaceae. It is native to southwestern and central Asia, but nowadays is being cultivated worldwide, mostly in temperate regions. The consumable parts of spinach are the leaves. These are produced during the first stage of the life cycle of a spinach plant, during which the plant forms a leaf rosette. The second stage is the flowering stage or bolting stage. Bolting is the growth of an elongated stalk with flowers grown from within the main stem of a plant. During the bolting stage it is not possible anymore to harvest any marketable product of the plant. 
         [0005]    The leaves of a spinach plant are usually sold loose, bunched, in prepackaged bags, canned, or frozen. There are three basic types of spinach, namely savoy, semi-savoy and smooth. Savoy has dark green, crinkly and curly leaves. Flat or smooth leaf spinach has broad smooth leaves. Semi-savoy is a hybrid variety with slightly crinkled leaves. 
         [0006]    Citation or identification of any document in this application is not an admission that such document is available as prior art to the present invention. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides a new inbred line of spinach plants, called SP6504. Seeds of inbred spinach line SP6504 have been deposited with the National Collections of Industrial, Marine and Food Bacteria (NCIMB) in Bucksburn, Aberdeen AB21 9YA, Scotland, UK and have been assigned NCIMB Accession No. 41759. 
         [0008]    In one embodiment, the invention provides a spinach plant exhibiting a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11, representative seed of which having been deposited under NCIMB Accession No. 41759. (The growth rate of the spinach plant of the invention, e.g. SP6504, representative seed of which having been deposited under NCIMB Accession No. 41759, is comparable to Bloomsdale. The bolting of the spinach plant of the invention, e.g. SP6504, representative seed of which having been deposited under NCIMB Accession No. 41759, is also comparable to Bloomsdale (e.g. US20100031381). And the color of the spinach plant of the invention, e.g. SP6504, representative seed of which having been deposited under NCIMB Accession No. 41759, is akin to Hollandia, see also table 2.) 
         [0009]    In one embodiment, the invention provides a spinach plant designated SP6504, representative seed of which having been deposited under NCIMB Accession No. 41759. 
         [0010]    In an embodiment of the present invention, there also is provided parts of a spinach plant of the invention, including parts of a spinach plant having a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11, and one or more morphological or physiological characteristics tabulated herein, including parts of inbred spinach line SP6504, wherein the plant parts are suitable for sexual reproduction, which include, without limitation, microspores, pollen, ovaries, ovules, embryo sacs or egg cells and/or wherein the plant parts are suitable for vegetative reproduction, which include, without limitation, cuttings, roots, stems, cells or protoplasts and/or wherein the plant parts are tissue culture of regenerable cells in which the cells or protoplasts of the tissue culture are derived from a tissue such as, for example and without limitation, leaves, pollen, embryos, cotyledon, hypocotyls, meristematic cells, roots, root tips, anthers, flowers, seeds or stems. The plants of the invention from which such parts can come from include those wherein representative seed of which has been deposited under NCIMB Accession No. NCIMB 41759. With regard to morphological or physiological characteristics, it is understood that these are compared when plants are grown in the same environmental conditions. 
         [0011]    In another embodiment there is a plant grown from seeds, representative seed of which having been deposited under NCIMB Accession No. 41759. In a further embodiment there is a plant regenerated from the above-described plant parts or regenerated from the above-described tissue culture. Advantageously such a plant has morphological and/or physiological characteristics of inbred spinach line SP6504 and/or of plant grown from seed, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759—including without limitation such plants having all of the morphological and physiological characteristics of inbred spinach line SP6504 and/or of plant grown from seed, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759. Accordingly, in still a further embodiment, there is provided a spinach plant having all of the morphological and physiological characteristics of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759. Such a plant can be grown from the seeds, regenerated from the above-described plant parts, or regenerated from the above-described tissue culture. A spinach plant having any of the aforementioned resistance(s), a spinach plant having any of the aforementioned resistance(s) and one or more morphological or physiological characteristics recited or tabulated herein, and a spinach plant advantageously having all of the aforementioned resistances and the characteristics recited and tabulated herein, are preferred. Parts of such plants—such as those plant parts above-mentioned—are encompassed by the invention. 
         [0012]    In one embodiment, there is provided progeny of inbred spinach line SP6504 produced by sexual or vegetative reproduction, grown from seeds, regenerated from the above-described plant parts, or regenerated from the above-described tissue culture of the inbred spinach line or a progeny plant thereof, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759. 
         [0013]    In another embodiment, there is provided progeny of inbred spinach line SP6504 produced by sexual or vegetative reproduction, grown from seeds, regenerated from the above-described plant parts, or regenerated from the above-described tissue culture of the inbred spinach line or a progeny plant thereof, in which the regenerated plant exhibits a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759. 
         [0014]    Progeny of the inbred spinach line SP6504 can be modified in one or more other characteristics, in which the modification is a result of, for example and without limitation, mutagenesis or transformation with a transgene. 
         [0015]    In still another embodiment, there is provided progeny of inbred spinach line SP6504 produced by sexual or vegetative reproduction, grown from seeds, regenerated from the above-described plant parts, or regenerated from the above-described tissue culture of the inbred spinach line or a progeny plant thereof, in which the regenerated plant is exhibits a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11. 
         [0016]    Like most vegetables varieties, spinach varieties are usually hybrids. The breeding of a hybrid spinach variety basically involves four steps: The first step comprises selecting and crossing of plants in order to obtain plants with desired traits, such as e.g. disease or pest resistances, better yield, better tolerance to climatic conditions, etc. The second step comprises selfing those plants with superior traits for several generations in order to produce inbred lines. Although these lines are different from each other, each line will become highly uniform after several generations of inbreeding. The third step comprises crossing the inbred lines to produce hybrid plants. Finally, the inbred lines that give rise to the best hybrid are identified. From there, commercial production of hybrid seed can start. 
         [0017]    In one embodiment, the invention comprises a method of producing a hybrid spinach seed comprising crossing a first parent spinach plant with a second parent spinach plant and harvesting the resultant hybrid spinach seed, wherein said first parent spinach plant or said second parent spinach plant is a spinach plant of the invention, e.g., a plant which exhibits a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11, or a spinach plant having any of the aforementioned resistance(s) and one or more morphological or physiological characteristics tabulated herein, including a spinach plant of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB 41759. 
         [0018]    In still a further embodiment, the invention comprises a method of producing a spinach cultivar containing a combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11, comprising: crossing a mother spinach plant with a father spinach plant to produce a hybrid seed; growing said hybrid seed to produce a hybrid plant; selfing said hybrid seed to produce F2 progeny seed; selecting said F2-plants for having medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11. 
         [0019]    The invention even further relates to a method of producing spinach comprising: (a) cultivating to the vegetative plant stage a plant of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759, and (b) harvesting spinach from the plant. The invention further comprehends canning, freezing or packaging the spinach plants or leaves. 
         [0020]    Accordingly, it is an object of the invention to not encompass within the invention any previously known product, process of making the product, or method of using the product such that Applicants reserve the right and hereby disclose a disclaimer of any previously known product, process, or method. It is further noted that the invention does not intend to encompass within the scope of the invention any product, process, or making of the product or method of using the product, which does not meet the written description and enablement requirements of the USPTO (35 U.S.C. §112, first paragraph) or the EPO (Article 83 of the EPC), such that Applicants reserve the right and hereby disclose a disclaimer of any previously described product, process of making the product, or method of using the product. 
         [0021]    It is noted that in this disclosure and particularly in the claims and/or paragraphs, terms such as “comprises”, “comprised”, “comprising” and the like can have the meaning attributed to it in U.S. Patent law; e.g., they can mean “includes”, “included”, “including”, and the like; and that terms such as “consisting essentially of” and “consists essentially of” have the meaning ascribed to them in U.S. Patent law, e.g., they allow for elements not explicitly recited, but exclude elements that are found in the prior art or that affect a basic or novel characteristic of the invention. 
         [0022]    These and other embodiments are disclosed or are obvious from and encompassed by, the following Detailed Description. 
       DEPOSIT 
       [0023]    The Deposit with NCIMB Ltd, Ferguson Building, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, UK, under deposit accession number NCIMB 41759 was made pursuant to the terms of the Budapest Treaty. Upon issuance of a patent, all restrictions upon the deposit will be removed, and the deposit is intended to meet the requirements of 37 CFR §1.801-1.809. The deposit will be maintained in the depository for a period of 30 years, or 5 years after the last request, or for the effective life of the patent, whichever is longer, and will be replaced if necessary during that period. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    The following Detailed Description, including the Examples, given by way of example, but not intended to limit the invention solely to the specific embodiments described, may be best understood in conjunction with the accompanying drawings, incorporated herein by reference, in which: 
           [0025]      FIG. 1  shows leaf shapes; and 
           [0026]      FIG. 2  shows leaf tip shapes. 
           [0027]      FIGS. 1 and 2  are provided to assist the reader in appreciating the appearance round pointed leaf tip, and arrow shaped leafs of the inventive spinach. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0028]    The invention provides methods and compositions relating to plants, seeds and derivatives of a new inbred line of spinach plants herein referred to as inbred spinach line SP6504. Inbred spinach line SP6504 is a uniform and stable line, distinct from other such lines. Crossing inbred spinach line SP6504 with another distinct inbred spinach line will yield uniform F1 hybrid progeny plants. 
         [0029]    The F1 may be self-pollinated to produce a segregating F2 generation. Individual plants may then be selected which represent the desired phenotype in each generation (F3, F4, F5, etc.) until the traits are homozygous or fixed within a breeding population. Inbred spinach line SP6504 was developed out of a cross between GB.25375 and an experimental F1 00.20125. After 3 selection and selfing cycles, a final round of mass selection was performed, selecting for uniformity. 
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Breeding history of SP6504 (M = mass selection). 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Year 1 
                 Cross between GB.25375 and an experimental F1 00.20125 
               
               
                 Year 1 
                 F2 Generation gown 
               
               
                 Year 2 
                 F3 generation grown 
               
               
                 Year 3 
                 F4 generation grown 
               
               
                 Year 4 
                 F4.M1 
               
               
                   
               
             
          
         
       
     
         [0030]    In one embodiment, a plant of the invention has all the morphological and physiological characteristics of inbred spinach line SP6504. These physiological and morphological characteristics of spinach of the invention, e.g., line SP6504, are summarized in table 2. Embodiments of the invention advantageously have one or more, and most advantageously all, of these characteristics. 
         [0000]    
       
         
               
             
               
               
               
             
           
               
                 TABLE 2 
               
             
             
               
                   
               
               
                 Physiological and morphological characteristics of SP6504 
               
               
                 and comparison variety Buffalo. 
               
             
          
           
               
                 Line/Cultivar 
                 SP 6504 
                 Buffalo 
               
               
                   
               
               
                 For patent or comparison 
                 Patent 
                 Comparison 
               
               
                 Characteristics 
               
               
                 Species 
                 
                   Spinacia 
                 
                 
                   Spinacia 
                 
               
               
                   
                   oleracea  L. 
                   oleracea  L. 
               
               
                 Ploidy 
                 Diploid 
                 Diploid 
               
               
                 Maturity 
               
               
                 Growth Rate 
                 Medium (Long 
                 Medium (Long 
               
               
                   
                 Standing 
                 Standing 
               
               
                   
                 Bloomsdale) 
                 Bloomsdale) 
               
               
                 Days from planting to prime 
                 34 
                 23 
               
               
                 market stage 
               
               
                 Plant (prime market stage) 
               
               
                 Habit 
                 Flat (Viroflay) 
                 Flat (Viroflay) 
               
               
                 Size 
                 Medium 
                 Large (Giant Nobel) 
               
               
                 Spread (cm) 
                 48 
                 58 
               
               
                 Height (cm) 
                 11 
                 14 
               
               
                 Seedling Cotyledon 
               
               
                 Width (mm) 
                 5 
                 8 
               
               
                 Length (mm) 
                 73 
                 75 
               
               
                 Tip 
                 Pointed 
                 Round 
               
               
                 Color 
                 Light Green 
                 Light Green 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 144A 
                 144A 
               
               
                 Leaf (First Foliage Leaves) 
               
               
                 Shape 
                 Ovate 
                 Ovate 
               
               
                 Base 
                 Lobed 
                 Lobed 
               
               
                 Tip 
                 Pointed 
                 Round-pointed 
               
               
                 Margin 
                 Slightly Curled 
                 Curled under 
               
               
                 Upper Surface Color 
                 Medium Green 
                 Light Green 
               
               
                   
                 (Giant Nobel) 
                 (Hollandia) 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 137 B 
                 137 C 
               
               
                 Lower surface Color 
                 Lighter 
                 Same 
               
               
                 (compared with upper) 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 137 C 
                 137 C 
               
               
                 Leaf (Prime Market Stage) 
               
               
                 Surface 
                 Smooth (Viroflay) 
                 Smooth (Viroflay) 
               
               
                 Shape 
                 Arrow-shaped 
                 Arrow-shaped 
               
               
                 Base 
                 Straight 
                 Straight 
               
               
                 Tip 
                 Round-pointed 
                 Round 
               
               
                 Margin 
                 Flat 
                 Slightly Curled 
               
               
                 Upper Surface Color 
                 Light Green 
                 Medium Green 
               
               
                   
                 (Hollandia) 
                 (Giant Nobel) 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 144 A 
                 146 A 
               
               
                 Lower surface Color 
                 Lighter 
                 Lighter 
               
               
                 (compared with upper) 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 146 B 
                 144 A 
               
               
                 Luster 
                 Dull 
                 Dull 
               
               
                 Blade Size 
                 Medium 
                 Large (Giant Nobel) 
               
               
                   
                 (Virginia Savoy) 
               
               
                 Blade Lobing 
                 Lobed 
                 Lobed 
               
               
                 Petiole Color 
                 Medium Green 
                 Medium Green 
               
               
                 Color Chart Name 
                 RHS CC 
                 RHS CC 
               
               
                 Color Chart Value 
                 144 A 
                 144 C 
               
               
                 Petiole Red Pigmentation 
                 Absent 
                 Absent 
               
               
                 Petiole Length to the Blade 
                 6 
                 7 
               
               
                 (cm) 
               
               
                 Petiole Length 
                 Medium 
                 Medium 
               
               
                 Petiole Diameter (mm) 
                 6 
                 5 
               
               
                 Petiole Diameter 
                 Medium 
                 Medium 
               
               
                 Seed Stalk Development 
               
               
                 Start of bolting (10% of the 
                 Medium (Long 
                 Medium(Long 
               
               
                 plants) 
                 Standing 
                 Standing 
               
               
                   
                 Bloomsdale) 
                 Bloomsdale) 
               
               
                 Height of Stalk (cm) 
                 55 
                 70 
               
               
                 Leaves on Stalk of Female 
                 Many 
                 Many 
               
               
                 plant 
               
               
                 Leaves on Stalk of Male plant 
                 — 
                 — 
               
               
                 Plants that are Female 
                 91-100% 
                 36-65% 
               
               
                 Plants that are Male 
                 — 
                 — 
               
               
                 Plants that are Monoecious 
                 — 
                 — 
               
               
                 Seed 
               
               
                 Surface 
                 Smooth 
                 Smooth 
               
               
                 Disease reaction 
               
               
                 Pf1 
                 Resistant 
                 Resistant 
               
               
                 Pf2 
                 Resistant 
                 Resistant 
               
               
                 Pf3 
                 Resistant 
                 Resistant 
               
               
                 Pf4 
                 Resistant 
                 Resistant 
               
               
                 Pf5 
                 Resistant 
                 Resistant 
               
               
                 Pf6 
                 Resistant 
                 Resistant 
               
               
                 Pf7 
                 Resistant 
                 Resistant 
               
               
                 Pf8 
                 Susceptible 
                 Resistant 
               
               
                 Pf9 
                 Resistant 
                 Resistant 
               
               
                 Pf10 
                 Susceptible 
                 Resistant 
               
               
                 Pf11 
                 Resistant 
                 Susceptible 
               
               
                 Downy mildew isolate 
                 Susceptible 
                 Susceptible 
               
               
                 US2209 
               
               
                 Fusarium 
                 Intermediate 
                 Not tested 
               
               
                 White Rust 
                 Not tested 
                 Not tested 
               
               
                 Curly Top Virus 
                 Not tested 
                 Not tested 
               
               
                 CMV 
                 Susceptible 
                 Susceptible 
               
               
                 Colletotrichum 
                 Intermediate 
                 Not tested 
               
               
                 Winter Hardiness 
                 Not tested 
                 Not tested 
               
               
                   
               
             
          
         
       
     
         [0031]    In an embodiment, the invention relates to spinach plants that has all the morphological and physiological characteristics of the invention and have acquired said characteristics by introduction of the genetic information that is responsible for the characteristics from a suitable source, either by conventional breeding, or genetic modification, in particular by cisgenesis or transgenesis. Cisgenesis is genetic modification of plants with a natural gene, coding for an (agricultural) trait, from the crop plant itself or from a sexually compatible donor plant. Transgenesis is genetic modification of a plant with a gene from a non-crossable species or a synthetic gene. 
         [0032]    Just as useful traits that can be introduced by backcrossing, useful traits can be introduced directly into the plant of the invention, being a plant of inbred spinach line SP6504, by genetic transformation techniques; and, such plants of inbred spinach line SP6504 that have additional genetic information introduced into the genome or that express additional traits by having the DNA coding there for introduced into the genome via transformation techniques, are within the ambit of the invention, as well as uses of such plants, and the making of such plants. 
         [0033]    Genetic transformation may therefore be used to insert a selected transgene into the plant of the invention, being a plant of inbred spinach line SP6504 or may, alternatively, be used for the preparation of transgenes which can be introduced by backcrossing. Methods for the transformation of plants, including spinach, are well known to those of skill in the art. 
         [0034]    Vectors used for the transformation of spinach cells are not limited so long as the vector can express an inserted DNA in the cells. For example, vectors comprising promoters for constitutive gene expression in spinach cells (e.g., cauliflower mosaic virus 35S promoter) and promoters inducible by exogenous stimuli can be used. Examples of suitable vectors include pBI binary vector. The “spinach cell” into which the vector is to be introduced includes various forms of spinach cells, such as cultured cell suspensions, protoplasts, leaf sections, and callus. A vector can be introduced into spinach cells by known methods, such as the polyethylene glycol method, polycation method, electroporation,  Agrobacterium -mediated transfer, particle bombardment and direct DNA uptake by protoplasts. 
         [0035]    To effect transformation by electroporation, one may employ either friable tissues, such as a suspension culture of cells or embryogenic callus or alternatively one may transform immature embryos or other organized tissue directly. In this technique, one would partially degrade the cell walls of the chosen cells by exposing them to pectin-degrading enzymes (pectolyases) or mechanically wound tissues in a controlled manner. 
         [0036]    A particularly efficient method for delivering transforming DNA segments to plant cells is microprojectile bombardment. In this method, particles are coated with nucleic acids and delivered into cells by a propelling force. Exemplary particles include those comprised of tungsten, platinum, and preferably, gold. For the bombardment, cells in suspension are concentrated on filters or solid culture medium. Alternatively, immature embryos or other target cells may be arranged on solid culture medium. The cells to be bombarded are positioned at an appropriate distance below the macroprojectile stopping plate. An illustrative embodiment of a method for delivering DNA into plant cells by acceleration is the Biolistics Particle Delivery System, which can be used to propel particles coated with DNA or cells through a screen, such as a stainless steel or Nytex screen, onto a surface covered with target spinach cells. The screen disperses the particles so that they are not delivered to the recipient cells in large aggregates. It is believed that a screen intervening between the projectile apparatus and the cells to be bombarded reduces the size of projectiles aggregate and may contribute to a higher frequency of transformation by reducing the damage inflicted on the recipient cells by projectiles that are too large. Microprojectile bombardment techniques are widely applicable, and may be used to transform virtually any plant species, including a plant of inbred spinach line SP6504. 
         [0037]      Agrobacterium -mediated transfer is another widely applicable system for introducing gene loci into plant cells. An advantage of the technique is that DNA can be introduced into whole plant tissues, thereby bypassing the need for regeneration of an intact plant from a protoplast.  Agrobacterium  transformation vectors are capable of replication in  E. coli  as well as  Agrobacterium , allowing for convenient manipulations. Moreover, advances in vectors for  Agrobacterium -mediated gene transfer have improved the arrangement of genes and restriction sites in the vectors to facilitate the construction of vectors capable of expressing various polypeptide coding genes. The vectors have convenient multi-linker regions flanked by a promoter and a polyadenylation site for direct expression of inserted polypeptide coding genes. Additionally,  Agrobacterium  containing both armed and disarmed Ti genes can be used for transformation. In those plant strains where  Agrobacterium -mediated transformation is efficient, it is the method of choice because of the facile and defined nature of the gene locus transfer. The use of  Agrobacterium -mediated plant integrating vectors to introduce DNA into plant cells, including spinach plant cells, is well known in the art (See, e.g., U.S. Pats. No. 7,250,560 and 5,563,055). 
         [0038]    Transformation of plant protoplasts also can be achieved using methods based on calcium phosphate precipitation, polyethylene glycol treatment, electroporation, and combinations of these treatments. 
         [0039]    A number of promoters have utility for plant gene expression for any gene of interest including but not limited to selectable markers, scoreable markers, genes for pest tolerance, disease resistance, nutritional enhancements and any other gene of agronomic interest. Examples of constitutive promoters useful for spinach plant gene expression include, but are not limited to, the cauliflower mosaic virus (CaMV) P-35S promoter, a tandemly duplicated version of the CaMV 35S promoter, the enhanced 35S promoter (P-e35S), the nopaline synthase promoter, the octopine synthase promoter, the figwort mosaic virus (P-FMV) promoter (see U.S. Pat. No. 5,378,619), an enhanced version of the FMV promoter (P-eFMV) where the promoter sequence of P-FMV is duplicated in tandem, the cauliflower mosaic virus 19S promoter, a sugarcane bacilliform virus promoter, a commelina yellow mottle virus promoter, the promoter for the thylakoid membrane proteins from spinach (psaD, psaF, psaF, PC, FNR, atpC, atpD, cab, rbcS) (see U.S. Pat. No. 7,161,061), the CAB-1 promoter from spinach (see U.S. Pat. No. 7,663,027), the promoter from maize prolamin seed storage protein (see U.S. Pat. No. 7,119,255), and other plant DNA virus promoters known to express in plant cells. A variety of plant gene promoters that are regulated in response to environmental, hormonal, chemical, and/or developmental signals can be used for expression of an operably linked gene in plant cells, including promoters regulated by (1) heat, (2) light (e.g., pea rbcS-3A promoter, maize rbcS promoter, or chlorophyll a/b-binding protein promoter), (3) hormones, such as abscisic acid, (4) wounding (e.g., wun1, or (5) chemicals such as methyl jasmonate, salicylic acid, or Safener. It may also be advantageous to employ organ-specific promoters. 
         [0040]    Exemplary nucleic acids which may be introduced to the multileaf trait spinach of this invention include, for example, DNA sequences or genes from another species, or even genes or sequences which originate with or are present in spinach species, but are incorporated into recipient cells by genetic engineering methods rather than classical reproduction or breeding techniques. However, the term “exogenous” is also intended to refer to genes that are not normally present in the cell being transformed, or perhaps simply not present in the form, structure, etc., as found in the transforming DNA segment or gene, or genes which are normally present and that one desires to express in a manner that differs from the natural expression pattern, e.g., to over-express. Thus, the term “exogenous” gene or DNA is intended to refer to any gene or DNA segment that is introduced into a recipient cell, regardless of whether a similar gene may already be present in such a cell. The type of DNA included in the exogenous DNA can include DNA which is already present in the plant cell, DNA from another plant, DNA from a different organism, or a DNA generated externally, such as a DNA sequence containing an antisense message of a gene, or a DNA sequence encoding a synthetic or modified version of a gene. 
         [0041]    Many hundreds if not thousands of different genes are known and could potentially be introduced into a plant of inbred spinach line SP6504. Non-limiting examples of particular genes and corresponding phenotypes one may choose to introduce into a spinach plant include one or more genes for insect tolerance, pest tolerance such as genes for fungal disease control, herbicide tolerance, and genes for quality improvements such as yield, nutritional enhancements, environmental or stress tolerances, or any desirable changes in plant physiology, growth, development, morphology or plant product(s). 
         [0042]    Alternatively, the DNA coding sequences can affect these phenotypes by encoding a non-translatable RNA molecule that causes the targeted inhibition of expression of an endogenous gene, for example via antisense- or cosuppression-mediated mechanisms. The RNA could also be a catalytic RNA molecule (i.e., a ribozyme) engineered to cleave a desired endogenous mRNA product. Thus, any gene which produces a protein or mRNA which expresses a phenotype or morphology change of interest is useful for the practice of the present invention. (See also U.S. Pat. No. 7,576,262, “Modified gene-silencing RNA and uses thereof.” 
         [0043]    U.S. Pats. Nos. 7,230,158, 7,122,720, 7,081,363, 6,734,341, 6,503,732, 6,392,121, 6,087,560, 5,981,181, 5,977,060, 5,608,146, 5,516,667, each of which, and all documents cited therein are hereby incorporated herein by reference, consistent with the above INCORPORATION BY REFERENCE section, are additionally cited as examples of U.S. patents that may concern transformed spinach and/or methods of transforming spinach or spinach plant cells, and techniques from these US Patents, as well as promoters, vectors, etc., may be employed in the practice of this invention to introduce exogenous nucleic acid sequence(s) into a plant of inbred spinach line SP6504 (or cells thereof), and exemplify some exogenous nucleic acid sequence(s) which can be introduced into a plant of inbred spinach line SP6504 (or cells thereof) of the invention, as well as techniques, promoters, vectors etc., to thereby obtain further plants of inbred spinach line SP6504, plant parts and cells, seeds, other propagation material harvestable parts of these plants, etc. of the invention, e.g. tissue culture, including a cell or protoplast, such as an embryo, meristem, cotyledon, pollen, leaf, anther, root, root tip, pistil, flower, seed or stalk. 
         [0044]    The invention further relates to propagation material for producing plants of the invention. Such propagation material comprises inter alia seeds of the claimed plant and parts of the plant that are suitable for sexual reproduction. Such parts are for example selected from the group consisting of seeds, microspores, pollen, ovaries, ovules, embryo sacs and egg cells. In addition, the invention relates to propagation material comprising parts of the plant that are suitable for vegetative reproduction, for example cuttings, roots, stems, cells, protoplasts. 
         [0045]    According to a further aspect thereof the propagation material of the invention comprises a tissue culture of the claimed plant. The tissue culture comprises regenerable cells. Such tissue culture can be derived from leaves, pollen, embryos, cotyledon, hypocotyls, meristematic cells, roots, root tips, anthers, flowers, seeds and stems. (See generally U.S. Pat. No. 7,041,876 on spinach being recognized as a plant that can be regenerated from cultured cells or tissue). 
         [0046]    Also, the invention comprehends methods for producing a seed of a “SP6504”-derived spinach plant comprising (a) crossing a plant of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759, with a second spinach plant, and (b) whereby seed of a “SP6504”-derived spinach plant form (e.g., by allowing the plant from the cross to grow to producing seed). Such a method can further comprise (c) crossing a plant grown from “SP6504”-derived spinach seed with itself or with a second spinach plant to yield additional “SP6504”-derived spinach seed, (d) growing the additional “SP6504”-derived spinach seed of step (c) to yield additional “SP6504”-derived spinach plants, and (e) repeating the crossing and growing of steps (c) and (d) to generate further “SP6504”-derived spinach plants. 
         [0047]    The invention additionally provides a method of introducing a desired trait into a plant of inbred spinach line SP6504 comprising: (a) crossing a plant of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759, with a second spinach plant that comprises a desired trait to produce F1 progeny; (b) selecting an F1 progeny that comprises the desired trait; (c) crossing the selected F1 progeny with a plant of inbred spinach line SP6504, to produce backcross progeny; (d) selecting backcross progeny comprising the desired trait and the physiological and morphological characteristic of a plant of inbred spinach line SP6504; and (e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny that comprise the desired trait and all of the physiological and morphological characteristics of a plant of inbred spinach line SP6504, when grown in the same environmental conditions. The invention, of course, includes a spinach plant produced by this method. 
         [0048]    Backcrossing can also be used to improve an inbred plant. Backcrossing transfers a specific desirable trait from one inbred or non-inbred source to an inbred that lacks that trait. This can be accomplished, for example, by first crossing a superior inbred (A) (recurrent parent) to a donor inbred (non-recurrent parent), which carries the appropriate locus or loci for the trait in question. The progeny of this cross are then mated back to the superior recurrent parent (A) followed by selection in the resultant progeny for the desired trait to be transferred from the non-recurrent parent. After five or more backcross generations with selection for the desired trait, the progeny are heterozygous for loci controlling the characteristic being transferred, but are like the superior parent for most or almost all other loci. The last backcross generation would be selfed to give pure breeding progeny for the trait being transferred. When a plant of inbred spinach line SP6504, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41759, is used in backcrossing, offspring retaining the combination of traits including medium bolting, light green leaf color at maturity, medium growth rate, arrow shaped leaf, round pointed leaf tip, and resistance against downy mildew ( Peronospora farinose  f.sp.  spinaciae  (Pfs)) races 1 to 7, 9, and 11 are progeny within the ambit of the invention. Backcrossing methods can be used with the present invention to improve or introduce a characteristic into a plant of the invention, being a plant of inbred spinach line 6504. See, e.g., U.S. Pat. No. 7,705,206 (incorporated herein by reference consistent with the above INCORPORATION BY REFERENCE section), for a general discussion relating to backcrossing. 
         [0049]    The invention further involves a method of determining the genotype of a plant of inbred spinach line SP6504, representative seed of which has been deposited under NCIMB Accession No. NCIMB 41759, or a first generation progeny thereof, comprising obtaining a sample of nucleic acids from said plant and detecting in said nucleic acids a plurality of polymorphisms. This method can additionally comprise the step of storing the results of detecting the plurality of polymorphisms on a computer readable medium and/or transmitting the results of detecting the plurality of polymorphisms, e.g., by telephony or by means of computer (e.g., via email). The plurality of polymorphisms are indicative of and/or give rise to the expression of the morphological and physiological characteristics of inbred spinach line SP6504. 
         [0050]    Spinach leaves are sold in packaged form, including without limitation as pre-packaged spinach salad or as canned spinach or as frozen spinach. Mention is made of U.S. Pat. No. 5,523,136, incorporated herein by reference consistent with the above INCORPORATION BY REFERENCE section, which provides packaging film, and packages from such packaging film, including such packaging containing leafy produce, and methods for making and using such packaging film and packages, which are suitable for use with the spinach leaves of the invention. Thus, the invention comprehends the use of and methods for making and using the leaves of the spinach of the invention, as well as leaves of spinach derived from the invention. The invention further relates to a container comprising one or more plants of the invention, or one or spinach plants derived from a plant of the invention, in a growth substrate for harvest of leaves from the plant in a domestic environment. This way the consumer can pick very fresh leaves for use in salads. More generally, the invention includes one or more plants of the invention or one or more plants derived from spinach of the invention, wherein the plant is in a ready-to-harvest condition, including with the consumer picking his own, and further including a container comprising one or more of these plants. 
         [0051]    Having thus described in detail preferred embodiments of the present invention, it is to be understood that the invention is not to be limited to particular details set forth in the above description as many apparent variations thereof are possible without departing from the spirit or scope of the present invention.