Isolation and molecular characterization of a distinct begomovirus and its associated betasatellite infecting Hedyotis uncinella (Hook. et Arn.) in Vietnam
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A begomovirus isolate VN1 associated with symptomatic Hedyotis uncinella Hook. et Arn. from Vietnam was characterized. The virus, which we provisionally name H. uncinella yellow mosaic virus (HUYMV), has a monopartite genome of 2,749 nucleotides (nts). Pairwise comparisons of DNA-A sequences showed that HUYMV had a maximum nt sequence identity with Soybean crinkle leaf virus (SbLCV) and Premna leaf curl virus (PLCuV) at 82.1 and 81.9 %, respectively, which are less than the 89 % identity in the complete genome, which has been used as the threshold value for demarcation of species in the genus Begomovirus, the family Geminiviridae. One recombination event was detected for HUYMV, which involves an unknown begomovirus as the major parent and Tomato leaf curl Philippines virus (ToLCPV) as the minor parent, with nt 2163 and nt 2452 as the beginning and ending breakpoints, respectively. A betasatellite was found to be associated with HUYMV. The betasatellite showed the highest nt sequence identity (70 %) with Tomato leaf curl Philippine betasatellite—[Philippines:Laguna2:2006]. The name H. uncinella yellow mosaic betasatellite [Vietnam: Binh Dinh: 2013] was proposed for the betasatellite.
KeywordsBegomovirus New species Wild plant Hedyotis uncinella Hook. et Arn.
This study was supported by the Special Fund for Agro-scientific Research in the Public Interest (No. 201303028), the Foundation of President of GAAS of China (No. 201207), the Sino-Asean network for early-warning and management of major alien invasive pests (2013J4500032), and the National Natural Science Foundation of China (Grant No. 31301638). The authors are grateful to Dr. Sharon van Brunschot at The University of Queensland for her help in revising the article.
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