Patent Publication Number: US-PP33176-P2

Title: Dragon fruit plant named ‘DF 16’

Description:
Genus and species plant named:  Hylocereus undatus.    
     Variety denomination: ‘DF16’. 
     BACKGROUND OF THE INVENTION 
     The variety resulted from selection among a population of seedlings derived from a controlled cross carried out in 2013 between ‘RF’ (seed parent) (not patented) and ‘LD1’ (pollen parent) (not patented) in Tien Giang, Viet Nam. ‘DF16’ was identified in 2016 as having potential as a new variety due to its attractive fruit appearance, good eating quality and canker tolerance. ‘DF16’ was first asexually propagated by cuttings in 2017, in Tien Giang, Viet Nam. The resulting plants were planted in clonal trials and underwent further evaluation. The plants were subsequently also found to be true to type demonstrating that the characteristics of the new variety are stable and transmitted without change through succeeding propagations. 
     SUMMARY OF THE INVENTION 
     ‘DF16’ is characterized by its attractive medium sized fruit with light pink flesh and excellent flavour; dark pink to red skin color and tolerance to canker ( Neoscytalidium dimidiatum ). 
     Asexual reproduction of this new variety by cuttings, and in vitro shows that the aforementioned characteristics are true to form and are established and transmitted through succeeding propagation. 
     COMPARISON WITH PARENTAL AND COMMERCIAL VARIETIES 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Comparison table between female parent and variety 
               
            
           
           
               
               
               
            
               
                 Characteristic 
                 ‘RF’ 
                 ‘DF16’ 
               
               
                   
               
               
                 Flesh color 
                 Near white, NN155D 
                 Near light pink, 55C 
               
               
                 Fruit length 
                 Short, average 78 mm 
                 Medium, average 94 mm 
               
               
                 Stem length of  
                 Medium, average  
                 Medium, average  
               
               
                 segment 
                 889 mm 
                 790 mm 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Comparison table between male parent and variety 
               
            
           
           
               
               
               
            
               
                 Characteristic 
                 ‘LD1’ 
                 ‘DF6’ 
               
               
                   
               
               
                 Flesh color 
                 Near dark red, 53B 
                 Near light pink, 55C 
               
               
                 Stem length of  
                 Short, average  
                 Medium, average  
               
               
                 segment 
                 715 mm 
                 790 mm 
               
               
                 Young stem  
                 Medium to strong 
                 Absent to weak 
               
               
                 reddish color 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 Comparison table between commercial variety  
               
               
                 ‘LD5’ (not patented) and variety 
               
            
           
           
               
               
               
               
            
               
                   
                 Characteristic 
                 ‘LD5’ 
                 ‘DF16’ 
               
               
                   
               
               
                   
                 Young stem  
                 Medium 
                 Absent to weak 
               
               
                   
                 reddish color 
                   
                   
               
               
                   
                 Fruit length of  
                 Long, average  
                 Short, average  
               
               
                   
                 apical bracts 
                 66 mm 
                 35 mm 
               
               
                   
               
            
           
         
       
     
    
    
     
       BRIEF DESCRIPTION OF PHOTOGRAPHS 
       The accompanying photographs show typical specimens of the tree, foliage and fruit of the new variety as depicted in colors as nearly true as is reasonably possible to make the same in a color illustration of this character. 
         FIG. 1 : ‘DF16’ cut fruit segments. 
         FIG. 2 : ‘DF16’ cut fruit. 
         FIG. 3 : ‘DF16’ whole fruit. 
         FIG. 4 : ‘DF16’ fruit two-year-old plant. 
     
    
    
     DETAILED DESCRIPTION 
     The following is a description of the new variety with color terminology in accordance with The Royal Horticultural Society Colour Charts (R.H.S.C.C.) 2015 edition. 
     The specimens described were grown in Tien Giang, Viet Nam. The observations were made in the 2018-2020 season on 1-2 year-old plant.
     Plant:
             Form .—Drooping.     Vigour .—Strong.     Habit .—Climbing cactus.       
       Young stem:
             Reddish color .—Absent to weak intensity.       
       Stem: Observation made on mature stems segment at end of year&#39;s growth.
             Shape .—Three broad thin ribs.     Length of segment .—Medium, average 790 mm.     Width .—Medium, average 44 mm.     Waxiness .—Weak.     Texture of surface .—Smooth.     Distance between areoles .—Medium, average 53 mm.     Arch height .—Medium, average 4 mm.     Margin of rib .—Convex.     Intensity of grey color of areoles .—Dark intensity.       
       Areoles and spins: Observations made on intact mature stems.
             Number of spines .—Medium to many, average 4.     Spine length .—Long, average 5 mm.     Spine main color .—Near brown N201A.       
       Flower bud: Observation made 17 days after flower bud burst.
             Shape .—Elliptic.     Shape at apex .—Acute.     Color .—Near light green 144A.     Length of pericarpel .—Short, average 33 mm.     Width of pericarpel .—Short, average 28 mm.     Length of perianth .—Medium, average 27 mm.       
       Flower: Observations made at full flower opening.
             Intensity of red color of bract .—Weak to medium intensity.     Shape .—Bell shaped.     Petal color .—Near white NN155D.     Sepal main color .—Near light green N144D.     Sepal pattern of secondary color .—None.     Length of style .—Medium, average 25 mm.     Number of stigma lobes .—Medium, average 25 mm.     Color of stigma lobe .—Green.     Position of anthers in relation to stigma .—Same level.     Flowering time .—Mid April; nocturnal.       
       Fruit: Observations made on 5 intact fruit fully mature for consumption 3 to 5 days after first color change.
             Length .—Medium, average 94 mm.     Width .—Narrow to medium, average, 62 mm.     Weight .—Medium, average 290 g.     Ratio length/width .—Medium.     Number of bracts .—Medium, average 23.     Length of apical bracts .—Short, average 35 mm.     Position of bracts towards the peel .—Slightly held out, average 2 mm.     Main color of middle bracts .—Near red 53D.     Width of the base of the bracts .—Narrow, average 25 mm.     Thickness of peel .—Thick, average 2 mm.     Color of peel  ( excluding bracts ).—Near pink 63B.     Color of flesh .—Near light pink 55C.     Sweetness .—High, brix 19.     Apical cavity .—Medium, average 19 mm.     Seed size .—Small to medium.     Harvest .—Mid May to the end of November. Harvested in the same window as ‘LD1’ and ‘LD5’.       
       Use: Fresh market.
             Disease .—Tolerant to canker  Neoscytalidium dimidiatum.