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- W2153669339 abstract "An outbreak of a new potato disease occurred in Texas and Nebraska causing a serious defect in potato chips produced from commercial processing potatoes. The defect consists of patchy brown discoloration of chips and can be a cause for rejection of contracted potatoes by the processor. Infected potato plants exhibit symptoms of the purple top wilt syndrome similar to those of the purple top disease in processing potatoes caused by clover proliferation phytoplasma recently found in Washington and Oregon (3). Foliar symptoms include stunting, chlorosis, slight purple coloration of new growth, swollen nodes, proliferated axillary buds, and aerial tubers. Tuber symptoms include mild vascular discoloration and brown flecking of medullary rays. Seed potatoes from affected plants produce hair sprouts. Total nucleic acid was extracted from leaf and stolon tissue of symptomatic plants in the field and from tuber samples exhibiting the defect from commercial storages. Nested polymerase chain reactions (PCR) were performed using phytoplasma-universal 16SrDNA-based primers (P1/P7 and R16F2n/R16R2) (2) to detect the presence of phytoplasmas in these samples. A negative control, devoid of DNA templates in the reaction mix, was included in all PCR assays. In 2004, 13 foliar samples tested positive for phytoplasmas using PCR. None of the apparently symptomless plants or tubers tested positive. Restriction fragment length polymorphism (RFLP) analysis of the PCR-amplified 16S rDNA using enzymes AluI, MseI, HhaI, BfaI, and Tsp509I indicated that four samples are associated with a phytoplasma belonging to subgroup A (16SrI-A) of the “Candidatus Phytoplasma asteris” (aster yellows phytoplasma) group (16SrI), and nine plant samples were associated with a new phytoplasma related to, but distinct from, the stolbur phytoplasma group (16SrXII). Nucleotide sequence analysis of cloned 16S rDNAs (GenBank Accession Nos. DQ174114-DQ174123) confirmed the results on the basis of RFLP analyses. Sequences of cloned 16S rDNAs were analyzed with previously described phytoplasma strains available in GenBank using DNAStar's (Madison, WI) Lasergene software MegAlign program. The new phytoplasma is only distantly related to the stolbur phytoplasma, sharing 96.6% sequence homology. In 2005, 14 defective tuber samples from storage and 16 symptomatic plants from the field tested positive for the new phytoplasma. In Texas and Nebraska, it appears that at least two distinct phytoplasmas seem to be involved in the disease complex contributing to the defects of processed products produced from infected potatoes. Previous reports have suggested a similar defect of chipping potatoes, but the phytoplasma associated with the disease was not identified (1). To our knowledgek, this the first report of this new phytoplasma associated with disease and defects of potato and the first report of this phytoplasma in the United States. References: (1) E. E. Bantarri et al. Trans. ASAE 33:221, 1990. (2) I.-M. Lee et al. Int. J. Sys. Bacteriol. 48:1153, 1998. (3) I.-M. Lee et al. Plant Dis. 88:429, 2004." @default.
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- W2153669339 date "2006-03-01" @default.
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- W2153669339 title "First Report of a Defect of Processing Potatoes in Texas and Nebraska Associated with a New Phytoplasma" @default.
- W2153669339 doi "https://doi.org/10.1094/pd-90-0377b" @default.
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