Molecular epidemiology of cucurbit-infecting potyviruses: a rapid turnover of viral strains with a potential impact for resistance breeding
2021
Desbiez, Cecile | Wipf-Scheibel, Catherine | MILLOT, Pauline | Girardot, Gregory | Lecoq, Hervé
International audience
显示更多 [+] 显示较少 [-]英语. Viruses represent important threats for cucurbit production worldwide, affecting both the yield and quality of the products. Whitefly-transmitted viruses are now emerging in areas where climatic conditions are favorable for their vectors, and aphid-transmitted viruses remain important in numerous countries, notably in temperate climatic conditions. Long-term surveys and field assays in Southeastern France, associated with molecular epidemiology approaches, have helped to understand better the evolution of populations of aphid-borne viruses, with a focus on the potyviruses watermelon mosaic virus (WMV) and zucchini yellow mosaic virus (ZYMV). Multiple introductions of new strains have been observed in the last 20 years. In the case of WMV, these new strains can be associated with more severe symptoms. They are now present throughout Europe; in France, they have replaced within less than 10 years the “classic” strains present before. Recombinants between “classic” and emerging strains have also been observed, but they do not appear to present a higher pathogenicity so far. Recent studies have revealed that introductions and partial replacement of molecularly divergent variants are still taking place. The high viral diversity and constantly changing populations of cucurbit viruses should be taken into account in breeding programs, since they can affect the efficiency and durability of resistance genes.
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