bluuebunny/crossref_metadata_2025_split huggingface dataset:
First Report of Boll Rot of Cotton Caused by Pantoea agglomerans in China
Authors: Ren Y. Z. , Liu Y. Q. , Ding S. L. , Li G. Y. , Zhang H. 
Published: August 2008

Since the summer of 2006, bacterial boll rot of cotton has been observed on fruits of ‘Xinluzao 31’ (Xinluzao 6 × Acala) in Xinjiang Province. It resulted in as much as 20% yield loss in several fields. Symptoms do not appear on the outer carpel. In the infected cotton bolls, fibers do not mature completely and seed tissue exhibits brown necrotic coloration. Lint and seeds from 24 surface-disinfested cotton bolls were triturated and plated onto King's medium B (KB). Plates were incubated at 28°C for 48 h. Forty eight strains with yellow pigmentation on KB were characterized. All were nonfluorescent on KB, gram negative, facultatively anaerobic, unable to produce indole from tryptophan, able to reduce nitrate to nitrite, and produce acid from glucose, cellobiose, lactose, melibiose, and melonate. In addition, 16S rDNA in seven strains was amplified with universal primers (1). The PCR products were cloned into pGEM-T easy vector and sequenced. A BLAST search of the seven sequences against the GenBank nucleotide library indicated 100% identity with the 16S rDNA sequence of Enterobacter agglomerans strain A80. Then an additional primer pair, pagF and pagR (3), was used for more specific amplification of Pantoea agglomerans 16S rDNA, which resulted in single highly specific fragments of approximately 1 kb. On the basis of morphological, physiological, biochemical characteristics, and 16S rRNA gene sequence analysis, we identified the bacterium to be P. agglomerans. To confirm pathogenicity, cell suspensions (1 × 108 CFU/ml) of eight representative strains were used to inoculate cotton at peak bolling stage in the field. Cell suspensions, or water as the control, were applied to stigma scars, wall sutures, and scratch wounds on bracts, calyxes, and bolls. Alternatively, a needle was used to puncture through a drop of suspension placed on the boll wall suture and bracts. At least 20 bolls or flowers were inoculated with each bacterial strain per inoculation method. Infection occurred only when bacterial injections breached the endocarp of the boll either through the carpel wall or a suture between carpel sections. Disease symptoms developed 1 week postinoculation. The inoculated organism was reisolated from the diseased tissues. P. agglomerans is generally regarded to be a soil saprophyte or leaf epiphyte, but strains can opportunistically infect plants triggering gall formations or human wounds causing septic arthritis. The disease symptoms and pathogen characteristics observed in this study are identical to those reported in the United States (2). To our knowledge, this is the first report of P. agglomerans causing boll rot of cotton in China. References: (1) S. Manulisi and I. Barash. Mol. Plant Pathol. 4:307, 2003. (2) E. G. Medrano et al. J. Appl. Microbiol. 103:436, 2007. (3) S. Vorwerk et al. Agric. For. Entomol. 9:57, 2007.
First Report of Seven Species of Sooty Blotch and Flyspeck Fungi on Asimina triloba in Iowa
Authors: Hemnani K. , O'Malley P. J. , Tanović B. , Batzer J. C. , Gleason M. L. 
Published: August 2008

Fungi in the sooty blotch and flyspeck (SBFS) complex cause major economic losses on cultivated pome fruits in humid regions worldwide and also colonize many species of reservoir host plants. In 2007, 10 mature fruit of pawpaw (Asimina triloba), a native tree in eastern North America exhibiting SBFS colonies on the epicuticular wax layer, were collected from wild trees in eastern Iowa. Colonies of SBFS fungi on the fruit were described according to mycelial type (1). Isolates of representative colonies on acidified water agar were subcultured on potato dextrose agar and the morphological characters were observed. After DNA was extracted from cultures and amplified by PCR using primer set ITS-1F/ITS4, 470-bp sequences were compared with those of previously identified SBFS species using NCBI BLAST. The BLAST analysis showed 100% homology of the sequences with six species that had been previously confirmed to cause SBFS on apple fruit by fulfilling Koch's postulates (1): Colletogloeum sp. FG2, Dissoconium aciculare, Peltaster sp. P2.1, P. fructicola, Stomiopeltis versicola, and Stomiopeltis sp. RS1 (GenBank Accession Nos. AY598907, AY598874, AY5988888, AY598887, AY5160165, and AY598882, respectively). Using the NCBI bl2seq application, Dothideomycete sp. CS2, an additional previously confirmed SBFS species, was revealed by sequence homology. Morphology of some SBFS species on pawpaw differed from that on apple. For example, Colletogloeum sp. FG2, which produces the fuliginous mycelial type (1) on apple fruit, developed the ridged honeycomb mycelial type on pawpaw fruit. D. aciculare and Stomiopeltis sp. RS1 produced the compact speck mycelial type on pawpaw, but are known to develop discrete speck and ramose mycelial types, respectively, on apple. These differences may result from host species differences in the epicuticular wax layer of the fruit. To our knowledge, this is the first report of SBFS fungi on A. triloba in North America, although the SBFS species Zygophiala jamaicensis was reported on the same host in Japan (2). Identifying SBFS fungi on reservoir host plants is an important step toward improving disease management strategies. References: (1) J. Batzer et al. Mycologia 97:1268, 2005. (2) H. Nasu and H. Kunoh Plant Dis. 71:361, 1987.
First Report of Verticillium Wilt Caused by Verticillium dahliae on Rudbeckia fulgida (Orange Coneflower) in Italy
Authors: Garibaldi A. , Bertetti D. , Gullino M. L. 
Published: August 2008

Rudbeckia fulgida (common name orange coneflower) is an herbaceous perennial (Asteraceae) grown in full sun in perennial borders in gardens. At the end of the summer of 2007, in a public garden located in Turin (northern Italy), symptoms of vascular wilt and stunting were observed on approximately 80% of the plants grown in a mixed border. Initial symptoms were yellowing of external leaves and brown or black streaks in the vascular tissue of roots, crown, and leaves. A fungus was consistently and readily isolated on potato dextrose agar from symptomatic vascular tissue previously disinfested in 1% sodium hypochloride. Ovoid, dark microsclerotia, 41 to 108 μm, developed in hyaline hyphae after 10 days of growth at 23°C (12 h of light and 12 h of dark). Hyaline, elliptical, single-celled conidia, 3.2 to 7.3 × 2.1 to 3.7 (average 4.7 × 2.8) μm, developed on verticillate conidiophores. On the basis of these morphological characteristics, the fungus was identified as Verticillium dahliae (4). The internal transcribed spacer (ITS) region of rDNA was amplified using primers ITS4/ITS6 and sequenced. BLASTn analysis (1) of the 530 bp showed a 100% homology with the sequence of V. dahliae. The nucleotide sequence has been assigned GenBank Accession No. EU 627007. Healthy, 30-day-old R. fulgida plants were grown in a steam-disinfested mix of sphagnum peat:pomix:pine bark:clay (50:20:20:10) infested with a conidial suspension (1.5 × 106/ml) of three isolates of V. dahliae isolated from infected plants. Noninoculated plants served as controls. Plants (16 per treatment) were grown in pots (3 liter vol) and maintained in a glasshouse at temperatures between 22 and 25°C and relative humidity between 50 and 70%. First wilt symptoms and vascular discoloration in the roots, crown, and veins developed 17 days after inoculation. Noninoculated plants remained healthy. The pathogenicity tests were carried out twice. To our knowledge, this is the first report in Italy of Verticillium wilt on R. fulgida. Wilts caused by V. dahliae on R. laciniata in Poland (3) and V. albo-atrum on R. hirta in the United States (2) were previously reported. The importance and economic impact of this disease is currently limited but may increase because of the popularity of Rudbeckia spp. in private and public parks. References: (1) S. F. Altschul et al. Nucleic Acids Res. 25:3389, 1997. (2) D. F. Farr et al. Fungi on Plants and Their Products in the United States. The American Phytopathological Society, St Paul, MN, 1989. (3) B. Leski. Rocz. Nauk Roln. 253, 1974. (4) G. F. Pegg and B. L. Brady. Verticillium Wilts. CABI Publishing, Wallingford, UK, 2002.
First Report of Aspergillus niger as a Plant Pathogen on Zingiber officinale from India
Authors: Pawar N. V. , Patil V. B. , Kamble S. S. , Dixit G. B. 
Published: August 2008

Zingiber officinale Rosc., belonging to the Zingiberaceae family, is medicinally important. It is commonly known as ginger and has been extensively cultivated for many centuries for use as a spice and traditional medicine in India. During a survey in September of 2007, leaves of Z. officinale showed a necrotic leaf spot disease on a plant growing in Kolhapur, India. Symptoms of the disease appeared as small (10 to 15 mm), rectangular to irregular, yellow spots on the leaves that covered a major area of the leaf when severe. The infection caused defoliation. Symptomatic leaves were collected and isolations from infected leaves were made on Czapek's Dox agar supplemented with streptomycin sulfate (30 mg/l). Plates were incubated at 28 to 30°C for 6 to 7 days. The fungal colonies were colorless to pale on the reverse side and covered with a dense layer of dark brown-to-black conidial heads. Conidia were globose to subglobose (3.5 to 5.0 μm in diameter), dark brown to black, and rough walled. 16S rRNA of isolates was amplified and sequenced (EMBL Accession No. AM941157) and compared with sequences of known Aspergillus species obtained from GenBank. The closest matches (99% identity) were with A. niger. On the basis of morphological and molecular approaches, the pathogen was confirmed as A. niger. Of five isolates, AN-5 was used for pathogenicity study. Koch's postulates were satisfied after reisolating the fungus from leaves inoculated with a conidial suspension that showed symptoms (6 days after inoculation) similar to the lesions observed on the leaves collected from Z. officinale. The tests were repeated three times in the greenhouse. Healthy, potted Z. officinale plants were grown in isolation after artificial inoculation with a suspension of spores (10,000 conidia per ml), which was prepared in 100 ml of sterile distilled water and then sprayed on the abaxial and adaxial surface of leaves. Noninoculated plants served as controls. These results confirmed the pathogenicity of A. niger on Z. officinale. To our knowledge, this is the first report of A. niger causing a disease on ginger (1). Reference: (1) G. N. Dake. J. Spices Aromatic Crops. 4:40, 1995.
First Report of Powdery Mildew Caused by Oidium neolycopersici on Tomato in China
Authors: Li C. W. , Pei D. L. , Wang W. J. , Ma Y. S. , Wang L. , Wang F. , Liu J. L. , Zhu W. M. 
Published: August 2008

Tomato powdery mildew can cause remarkable reduction in fruit size and quality (4). In March of 2008, powdery mildew appeared as circular, white colonies on leaves, petioles, and stems of tomato plants grown in greenhouses in Shangqiu, Henan Province, China. The pathogenic fungus had unbranched conidiophores with an average length of 58.4 μm and width of 5.1 μm. Conidia were hyaline, elliptical, and were borne singly. Average length and width of conidia were 30.6 and 15.1 μm, respectively. Germ tubes were straight and formed at the ends or very close to the ends of conidia. Chasmothecium was not found in the collected samples. Different tomato cultivars and species, including Lycopersicon esculentum Mill (cvs. Moneymaker, Micro-Tom, Zaofen, Fenguo, and Zhongza series), L. peruvianum cv. LA2172, and L. hirsutum cv. G1.1560, were inoculated with a conidial suspension with a concentration of 5 × 104 conidia/ml. Plants developed powdery mildew symptoms as early as 4 days after inoculation. Susceptible symptoms developed on all L. esculentum cultivars, while L. peruvianum LA2172 and L. hirsutum G1.1560 displayed complete resistance, which is similar to the results of Bai et al 2004 (1) and Lindhout and Pet 1990 (3). Morphological characteristics of the pathogen on susceptible genotypes were similar to those from naturally infected plants. On the basis of the characteristics of the asexual stage, the pathogen was identified as an isolate of Oidium neolycopersici L. Kiss, which was confirmed by internal transcribed spacer (ITS) sequence analysis. PCR amplification and sequencing of the ITS region were performed with primers ITS1 and ITS4. The nucleotide sequence was assigned GenBank Accession No. EU486992, which had a 100% homology with 10 ITS sequences of O. neolycopersici in GenBank (Accession Nos. EU047559 to 047568) (2). In Asia, the spread of this pathogen has been recently reported in Japan (2). To our knowledge, this is the first report of tomato powdery mildew in China. Voucher specimens are available at the Specimen Center in the Department of Life Science, Shangqiu Normal University. References: (1) Y. Bai et al. Mol. Plant-Microbe. Interact. 18:354, 2005. (2) T. Jankovics et al. Phytopathology 98:529, 2008. (3) P. Lindhout and G. Pet. Tomato Gen. Coop. Rep. 40:19, 1990. (4) J. M. Whipps et al. Plant Pathol. 47:36, 1998.
First Report of Fulvia fulva, Causal Agent of Tomato Leaf Mold, in Greenhouses in Southeastern Spain
Authors: de Cara M. , Heras F. , Santos M. , Marquina J. C. Tello 
Published: August 2008

Tomato (Solanum lycopersicum L.) is produced in more than 9,000 ha of greenhouses in Almería (southeastern Spain). During 2006 and 2007, a new disease was observed on almost all plants in 37 greenhouses. Yellow spots on upper and lower leaf surfaces were accompanied by gray-to-dark brown mycelia, conidiophores, and conidia on lower leaf surfaces. Affected leaves became necrotic and withered. Six isolates grown on malt extract agar (MEA) were identified as Fulvia fulva (1). The one- to three-celled conidia ranged from 21.8 × 7.8 μm to 21.5 × 6.5 μm. On MEA, potato dextrose agar, and V8 juice agar, the pathogen grew slowly; colonies were only 1 cm in diameter after 30 days. Colony color was initially intense yellow but became dark brown with age. In a growth chamber (12,000 lux for 16 h per day, 23 to 28°C, and 60 to 95% relative humidity), six pots containing five tomato plants (cv. SanPedro) at the four-true-leaf stage were inoculated with a conidial suspension (103 CFU/ml) of F. fulva. Control plants were sprayed with water. The trial was repeated once. Immediately after inoculation, plants were sealed in plastic bags for 8 days. Symptoms of the disease and signs of the pathogen were observed on all inoculated plants 18 days after inoculation. To our knowledge, this is the first report of leaf mold of tomato in Almería and it is becoming common in the greenhouse industry in this region. Reference: (1) P. Holliday and J. L. Mulder. No. 487 in: Descriptions of Pathogenic Fungi and Bacteria. CMI, Kew, Surrey, UK, 1976.
Amino Acid Polymorphisms in Strictly Conserved Domains of a P-Type ATPase HMA5 Are Involved in the Mechanism of Copper Tolerance Variation in Arabidopsis
Authors: Kobayashi Yuriko , Kuroda Keishi , Kimura Keisuke , Southron-Francis Jennafer L. , Furuzawa Aya , Kimura Kazuhiko , Iuchi Satoshi , Kobayashi Masatomo , Taylor Gregory J. , Koyama Hiroyuki 
Published: August 2008

AbstractCopper (Cu) is an essential element in plant nutrition, but it inhibits the growth of roots at low concentrations. Accessions of Arabidopsis (Arabidopsis thaliana) vary in their tolerance to Cu. To understand the molecular mechanism of Cu tolerance in Arabidopsis, we performed quantitative trait locus (QTL) analysis and accession studies. One major QTL on chromosome 1 (QTL1) explained 52% of the phenotypic variation in Cu tolerance in roots in a Landsberg erecta/Cape Verde Islands (Ler/Cvi) recombinant inbred population. This QTL regulates Cu translocation capacity and involves a Cu-transporting P1B-1-type ATPase, HMA5. The Cvi allele carries two amino acid substitutions in comparison with the Ler allele and is less functional than the Ler allele in Cu tolerance when judged by complementation assays using a T-DNA insertion mutant. Complementation assays of the ccc2 mutant of yeast using chimeric HMA5 proteins revealed that N923T of the Cvi allele, which was identified in the tightly conserved domain N(x)6YN(x)4P (where the former asparagine was substituted by threonine), is a cause of dysfunction of the Cvi HMA5 allele. Another dysfunctional HMA5 allele was identified in Chisdra-2, which showed Cu sensitivity and low capacity of Cu translocation from roots to shoots. A unique amino acid substitution of Chisdra-2 was identified in another strictly conserved domain, CPC(x)6P, where the latter proline was replaced with leucine. These results indicate that a portion of the variation in Cu tolerance of Arabidopsis is regulated by the functional integrity of the Cu-translocating ATPase, HMA5, and in particular the amino acid sequence in several strictly conserved motifs.
Combined Genetic and Modeling Approaches Reveal That Epidermal Cell Area and Number in Leaves Are Controlled by Leaf and Plant Developmental Processes in Arabidopsis
Authors: Tisné Sébastien , Reymond Matthieu , Vile Denis , Fabre Juliette , Dauzat Myriam , Koornneef Maarten , Granier Christine 
Published: August 2008

AbstractBoth leaf production and leaf expansion are tightly linked to cell expansion and cell division, but the functional relationships between all these variables are not clearly established. To get insight into these relationships, a quantitative genetic analysis was performed in 118 recombinant inbred lines derived from a cross between the Landsberg erecta and Antwerp accessions and was combined with a structural equation modeling approach. Main effects and epistatic interactions at the quantitative trait locus (QTL) level were detected for rosette area, rosette leaf number, leaf 6 area, epidermal cell area and number. A QTL at ERECTA marker (ER) controlled cell expansion and cell division, in interaction with two other QTLs at SNP295 and SNP21 markers. Moreover, both the screening for marker association involved in the variation of the relationships between leaf growth variables and the test of alternative functional models by structural equation modeling revealed that the allelic value at ER controlled epidermal cell area and epidermal cell number in a leaf. These effects are driven both by a whole plant mechanism associated with leaf production and by a single leaf mechanism associated with leaf expansion. The complex effects of the QTL at ER were validated in selected heterogeneous inbred families. The ERECTA gene, which is mutated in the Landsberg erecta parental line, was found to be a putative candidate responsible for these mapped effects by phenotyping mutants of this gene at the cellular level. Together, these results give insight into the complex determination of leaf epidermal cell number and area.
Lysophosphatidic acid stimulates the proliferation and motility of malignant pleural mesothelioma cells through lysophosphatidic acid receptors, LPA1 and LPA2
Authors: Yamada Tadaaki , Yano Seiji , Ogino Hirokazu , Ikuta Kenji , Kakiuchi Soji , Hanibuchi Masaki , Kanematsu Takanori , Taniguchi Tetsuo , Sekido Yoshitaka , Sone Saburo 
Published: August 2008

Lysophosphatidic acid (LPA) is one of the simplest natural phospholipids. This phospholipid is recognized as an extracellular potent lipid mediator with diverse effects on various cells. Although LPA is shown to stimulate proliferation and motility via LPA receptors, LPA1 and LPA2, in several cancer cell lines, the role of LPA and LPA receptors for malignant pleural mesothelioma (MPM) has been unknown. MPM is an aggressive malignancy with a poor prognosis and the incidence is increasing and is expected to increase further for another 10–20 years worldwide. Therefore, the development of novel effective therapies is needed urgently. In this study, we investigated the effect of LPA on the proliferation and motility of MPM cells. We found that all 12 cell lines and four clinical samples of MPM expressed LPA1, and some of them expressed LPA2, LPA3, LPA4 and LPA5. LPA stimulated the proliferation and motility of MPM cells in a dose‐dependent manner. Moreover, LPA‐induced proliferation was inhibited by Ki16425, an inhibitor of LPA1, and small interfering RNA against LPA1, but not LPA2. Interestingly, LPA‐induced motility was inhibited by small interfering RNA against LPA2, but not LPA1, unlike a number of previous reports. These results indicate that LPA is a critical factor on proliferation though LPA1, and on motility though LPA2 in MPM cells. Therefore, LPA and LPA receptors, LPA2 as well as LPA1, represent potential therapeutic targets for patients with MPM. (Cancer Sci 2008; 99: 1603–1610)
Estimation of the relationship between caspase‐3 expression and clinical outcome of Burkitt's and Burkitt‐like lymphoma
Authors: Nomura Yuko , Yoshida Shiro , Karube Kennosuke , Takeshita Morishige , Hirose Shinichi , Nakamura Shigeo , Yoshino Tadashi , Kikuchi Masahiro , Ohshima Koichi 
Published: August 2008

Burkitt's lymphoma and atypical Burkitt/Burkitt‐like lymphoma (BL/BLL) are considered highly aggressive B‐cell lymphomas with a rapid proliferative rate and high rate of apoptosis. The aim of the present study was to confirm whether apoptotic and cell proliferative factors affect BL/BLL clinical outcomes. We retrospectively analyzed the relationship between the clinical and immunophenotypic features of 43 BL/BLL patients by immunohistochemical staining for bcl‐2 and double staining for Ki‐67 plus caspase‐3. In double staining experiments, all patients were divided into high and low groups for the expression of caspase‐3, Ki‐67, and both Ki‐67 and caspase‐3, by using the medians of their percentages as limits. The 43 BL/BLL patients were divided into high caspase‐3 (n = 19) and low caspase‐3 (n = 24) groups. There was a significant difference in the overall survival between the high (77%) and low caspase‐3 (33%) groups; the survival rate of patients in the low caspase‐3 group who received aggressive short‐term chemotherapy (58%) was significantly better than that of patients who received cyclophosphamide, doxorubicin, vincristine and prednisolone (CHOP) therapy (17%). All patients positive for bcl‐2 were in the low caspase‐3 group (high caspase‐3 group, 0%; low caspase‐3 group, 42%). The overall survival tended to be better in the high caspase‐3 and bcl‐2‐negative group (76%) than in the low caspase‐3 and bcl‐2‐negative (50%) group. In addition, the low caspase‐3 and bcl‐2‐positive group tended to show the worst prognosis (16%). We suggest that caspase‐3 may function as an indicator of the prognosis of BL/BLL. Furthermore, intensive short‐term chemotherapeutic regimens may improve the prognosis of the patients in the low caspase‐3 group. (Cancer Sci 2008; 99: 1564–1569)