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- W2063012605 abstract "Whitefly-transmitted begomoviruses (family Geminiviridae, genus Begomovirus) cause severe epidemic and high yield losses on pepper (Capsicum annuum) crops in many areas of the world. In Taiwan, pepper plants showing leaf curling, blistering, distortion, mild vein yellowing, and stunting were observed in fields in Tainan County in 2007, but with disease incidence less than 10%. However, disease incidence of more than 70% was observed in some fields in Pingtung, Kaohsiung, Chiayi, and Yunlin counties in 2009. Two symptomatic samples in 2007 and three for each county in 2009 were collected for begomovirus detection. Viral DNA was extracted and tested for the presence of begomoviral DNA-A, DNA-B, and associated satellite DNA by PCR using primer pairs PAL1v1978/PAR1c715 (4), DNABLC1/DNABLV2 (2), and Beta01/Beta02 (1), respectively. The expected 1.5-kb PCR product for DNA-A and 2.6-kb for DNA-B were obtained from all samples. However, DNA-beta was not detectable in any of the samples. One positive sample from each, Pingtung (LG6-2), Kaoshiung (LJ3-5), Tainan (P2-4), Chiayi (SG4-3), and Yunlin (HW2-2), were selected for further molecular characterization of DNA-A and DNA-B. On the basis of the sequences of the 1.5-kb DNA-A and 2.6-kb DNA-B PCR product, specific PCR primers were designed to obtain the complete DNA-A and DNA-B sequences for pepper-infecting begomovirus isolate LG6-2 (GenBank Accession Nos. GU208515 and GU208519), LJ3-5 (GenBank Nos. GU208516 and GU208520), P2-4 (GenBank Nos. EU249457 and EU249458), SG4-3 (GenBank Nos. GU208517 and GU208521), and HW2-2 (GenBank Nos. GU208518 and GU208522). The five isolates each contained the begomoviral conserved nonanucleotide sequence-TAATATTAC in DNA-As and DNA-Bs, six open reading frames (ORFs AV1, AV2, AC1, AC2, AC3, and AC4) in DNA-As, and two open reading frames (ORFs BV1 and BC1) in DNA-Bs. Sequence comparison by MegAlign software (DNASTAR, Inc. Madison, WI) showed that the five pepper-infecting begomovirus isolates had 99% nucleotide sequence identity in DNA-As and DNA-Bs and so they are considered isolates of the same species. BLASTn analysis with begomovirus sequences available in the GenBank database at the National Center for Biotechnology Information (Bethesda, MD) indicated that the DNA-As and DNA-Bs of the five isolates had the highest nucleotide sequence identity of 99% each with the respective DNA-A and DNA-B of Tomato yellow leaf curl Thailand virus (TYLCTHV; GenBank Nos. EF577266 and EF577267), a recently emerging bipartite begomovirus infecting tomato in Taiwan (3). On the basis of the DNA-A sequence comparison and the International Committee on Taxonomy of Viruses demarcation of species at 89% sequence identity, these virus isolates belong to the species TYLCTHV. The isolate P2-4 was found transmissible to C. annuum ‘Early Calwonder’ by whitefly (Bemisia tabaci biotype B) and induced the same leaf curling, blistering, and mild vein yellowing symptoms as those observed in pepper fields. To our knowledge, this is the first report of a begomovirus infecting pepper in Taiwan. The presence of TYLCTHV in the major pepper-production areas should be taken into consideration for pepper disease management and in developing begomovirus resistant pepper cultivars for Taiwan. References: (1) R. W. Briddon et al. Mol. Biotechnol. 20:315, 2002. (2) S. K. Green et al. Plant Dis. 85:1286, 2001. (3) F.-J. Jan et al. Plant Dis. 91:1363, 2007 (4) M. R. Rojas et al. Plant Dis. 77:340, 1993." @default.
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- W2063012605 date "2010-05-01" @default.
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- W2063012605 title "First Report of <i>Tomato yellow leaf curl Thailand virus</i> Associated with Pepper Leaf Curl Disease in Taiwan" @default.
- W2063012605 doi "https://doi.org/10.1094/pdis-94-5-0637b" @default.
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