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Type: Master's thesis
Year: 2010
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Geminivirus Branch is a class of viruses are widely distributed in the world of plant single-stranded DNA virus, the virus in the Section whitefly transmitted geminiviruses in global tropical and subtropical climates serious harm occurred, is economically important viruses. Whitefly-transmitted geminivirus species has obvious geographical characteristics, that is, different regions have different populations. Yunnan is the whitefly transmitted Geminivirus high incidence areas, but due to the isolated mountain valleys, and its distribution is intermittent rather than continuous. This paper discusses the whitefly transmitted geminiviruses population distribution characteristics in different regions, and inter-and intraspecific genetic diversity analysis, comparative analysis of different geographical, ecological characteristics and differences in the distribution of popular influence on the occurrence of disease, which initially revealed Popular damage mechanism of its occurrence. 2008-2009, through Yunnan 4 Whitefly-transmitted geminivirus centralized distribution system surveys and collecting samples, the application of Whitefly-transmitted geminivirus DNA-A whole genome amplification, cloning and sequencing analysis of genome-wide access to 42 sequence, after more than 13 kinds of analysis belonged whitefly transmitted geminiviruses. Namely China Tomato yellow leaf curl virus (Tomato yellow leaf curl China virus, TYLCCNV), Yunnan chilli leaf curl virus (Pepper leaf curl Yunnan virus, PeLCYnV), Wild Chrysanthemum yellow vein virus (Crassocephalum yellow vein virus, CYVV), Yunnan Tobacco leaf curl virus (Tobacco leaf curl Yunnan virus, TbLCYnV), Tobacco curly shoot virus (Tobacco curly shoot virus, TbCSV), philoxeroides yellow vein virus (Alternanthera yellow vein virus, AlYVV), Malvastrum yellow vein virus (Malvastrum yellow vein virus, MYVV) and Yunnan Malvastrum yellow vein virus (Malvastrum yellow vein Yunnan virus, MYVYnV), Chinese squash leaf curl virus (Squash leaf curl China virus, SLCCNV), Sweet potato leaf curl virus (Sweet potato leaf curl virus, SPLCV), China Ageratum yellow vein virus (Ageratum yellow vein China virus, AYVCNV), Ageratum yellow vein virus (Ageratum yellow vein virus, AYVV), Thai Tomato yellow leaf curl virus (Tomato yellow leaf curl Thailand virus, TYLCTHV). Geminivirus first discovered new species PeLCYnV and Chinese New Records CYVV isolates. Yunnan four geminivirus species and their distribution virus isolates showed significant differences in composition, in which dry-hot valley in northern climates district offers four kinds of geminivirus, Chinese tomato yellow leaf curl virus (TYLCCNV) is the region's strengths kind; south-central Yuanjiang - Red River drainage basin has four geminivirus, the dominant species is TYLCCNV, followed by Yunnan chilli leaf curl virus (PeLCYnV); western humid climates district offers four kinds of geminivirus dominant species of sweet potato leaf curl virus (SPLCV); southern distribution of Lancang River Basin has four Geminivirus dominant species, Tobacco curly shoot virus (TbCSV) and Yunnan Tobacco leaf curl virus (TLCYnV). Different species of Yunnan in geminivirus DNA-A genome sequence level vary greatly, similarity is only 21%, or 79% variation, which has obvious geographical clustering characteristics of regional differences, the same area or adjacent areas isolates closer. Compared the dominant species in Yunnan Geminivirus TYLCCNV26 isolates were DNA-A, its similarity between 83.2% -99.9%, with the earliest discovered TYLCCNV Guangxi isolate the highest similarity of 95.6%. Phylogenetic tree from the point of view, TYLCCNV distribution in Yunnan there are significant geographic differences in different regions of isolates formed an independent branch, geographical similarity also closer closer (such as Dali and Lijiang). Yunnan four different distribution of geminivirus species and populations change on the occurrence of disease has a significant impact, including dry-hot valley in northern climates zones dominant species TYLCCNV population variability is relatively small, its main tomato crop damage, host relatively narrow range; while the dominant species in central and southern populations has obvious TYLCCNV nucleotide polymorphism, more types of crop damage, with tomatoes, pepper, tobacco and so on. Lancang River Basin in southern and western areas and humid climates of Southeast Asian countries prone areas adjacent geminivirus with suitable climate and many types of pathogens and other external conditions, so the composition of the virus species reported outside of the virus are more abundant species diversity. Research shows that Yunnan four geminivirus disease were concentrated occurrence of disease on the rise, its types and species composition varies in different years, the overall increasing trend. Therefore, these areas are the focus of prevention and control of such diseases and difficult areas, these areas should be strengthened monitoring and pre geminivirus control. |
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