By a News Reporter-Staff News Editor at Biotech Business Week -- A new study on RNA Viruses is now available. According to news reporting from Sydney, Australia, by NewsRx journalists, research stated, "The role played by seed transmission in the evolution and epidemiology of viral crop pathogens remains unclear. We determined the seed infection and vertical transmission rates of zucchini yellow mosaic virus (ZYMV), in addition to undertaking Illumina sequencing of nine vertically transmitted ZYMV populations."
The news correspondents obtained a quote from the research from the University of Sydney, "We previously determined the seed-to-seedling transmission rate of ZYMV in Cucurbita pepo ssp. texana (a wild gourd) to be 1.6%, and herein observed a similar rate (1.8%) in the subsequent generation. We also observed that the seed infection rate is substantially higher (21.9%) than the seed-to-seedling transmission rate, suggesting that a major population bottleneck occurs during seed germination and seedling growth. In contrast, that two thirds of the variants present in the horizontally transmitted inoculant population were also present in the vertically transmitted populations implies that the bottleneck at vertical transmission may not be particularly severe. Strikingly, all of the vertically infected plants were symptomless in contrast to those infected horizontally, suggesting that vertical infection may be cryptic. Although no known virulence determining mutations were observed in the vertically infected samples, the 5' untranslated region was highly variable, with at least 26 different major haplotypes in this region compared to the two major haplotypes observed in the horizontally transmitted population."
According to the news reporters, the research concluded: "That the regions necessary for vector transmission are retained in the vertically infected populations, combined with the cryptic nature of vertical infection, suggests that seed transmission may be a significant contributor to the spread of ZYMV."
For more information on this research see: Zucchini yellow mosaic virus (ZYMV, Potyvirus): Vertical transmission, seed infection and cryptic infections. Virus Research, 2013;176(1-2):259-264. Virus Research can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Virus Research - www.elsevier.com/wps/product/cws_home/506054)
Our news journalists report that additional information may be obtained by contacting H.E. Simmons, University of Sydney, Sydney Med Sch, Sydney, NSW 2006, Australia. Additional authors for this research include J.P. Dunham, K.E. Zinn, G.P. Munkvold, E.C. Holmes and A.G. Stephenson (see also RNA Viruses).
Keywords for this news article include: Sydney, Virology, Potyvirus, Potyviridae, RNA Viruses, Plant Viruses, Mosaic Viruses, Australia and New Zealand
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