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- W2116407825 abstract "Kidney bean (Phaseolus vulgaris) is an important cash crop in China. It is widely grown in the Yunnan Province in the southwest region. In November of 2008, a new disease was observed on kidney bean plants grown in Yuanmou County. Affected plants displayed symptoms that included numerous twisted lateral shoots with abundant, tiny trifoliate leaves that were approximately one-tenth the size of healthy leaves. Some affected leaves, which were slightly distorted and oblong to oval, were evident on diseased plants and appeared pale green. On plants with little leaf symptoms, flowers were poorly formed, withered or aborted, and no pods were present. Surveys conducted in areas affected by disease revealed the presence of the disease in approximately 10% of the plants. DNA was extracted from 0.1 g of petioles and midveins harvested from both diseased and symptomless plants with the Qiagen DNeasy Plant Mini Kit (Qiagen, Hilden, Germany). Plants were evaluated for phytoplasma infection by a nested PCR assay with phytoplasma specific ribosomal operon primer pair P1/Tint followed by R16F2/R16R2 (2,3). An rDNA product of approximately 1,250 bp was amplified from seven of seven diseased plants, whereas no products were amplified from symptomless plants or a negative control devoid of DNA. Digests of nested PCR products (approximately 200 ng) with endonucleases AluI, ScaI, or EcoRI revealed no differences in restriction fragment length polymorphism (RFLP) among diseased plants. The amplicon was cloned and sequenced (GenBank Accession No. GQ336993). Comparison of in silico RFLP profiles with published profiles showed that kidney bean little leaf phytoplasma is a member of peanut witches' broom group 16SrII. Blast analysis of the kidney bean little leaf phytoplasma 16S rDNA sequence revealed that this strain is most similar (99.0%) to Syringa oblata yellows phytoplasma (Accession No. FJ263629) and to other phytoplasmas classified as group 16SrII members. Previously, phytoplasmas identified as 16SrII strains have been reported as probable cause of cactus witches' broom (1) and crotalaria witches' broom (4) in China. To our knowledge, this is the first report of a 16SrII phytoplasma infecting the kidney bean in China. References: (1) H. Cai et al. Plant Pathol. 51:394, 2002. (2) I.-M Lee et al. Phytopathology 83:834, 1993. (3) C. D. Smart et al. Appl. Environ. Microbiol. 62:2988, 1996 (4) Z. H. Wang et al. Plant Pathol. 57:364, 2008." @default.
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- W2116407825 date "2010-01-01" @default.
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- W2116407825 title "First Report of Kidney Bean Little Leaf Disease Associated with 16SrII Group Phytoplasma in China" @default.
- W2116407825 doi "https://doi.org/10.1094/pdis-94-1-0132b" @default.
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