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Open AccessArticle

Emergence of Southern Rice Black-Streaked Dwarf Virus in the Centuries-Old Chinese Yuanyang Agrosystem of Rice Landraces

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CIRAD, BGPI, 34398 Montpellier, France
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BGPI, INRA, CIRAD, SupAgro, Univ Montpellier, 34398 Montpellier, France
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INRA, BGPI, 34398 Montpellier, France
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Department of Plant Pathology, National Chung Hsing University, Taichung 402, Taiwan
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CIRAD, UMR AGAP, 34398 Montpellier, France
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AGAP, Univ Montpellier, CIRAD, INRA, Montpellier SupAgro, 34398 Montpellier, France
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CIRAD, UMR ASTRE, 34398 Montpellier, France
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State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming 650201, China
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Southwest Forestry University, Kunming 650224, China
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Computational Biology Group, Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town 4579, South Africa
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Author to whom correspondence should be addressed.
Viruses 2019, 11(11), 985; https://doi.org/10.3390/v11110985
Received: 23 September 2019 / Revised: 10 October 2019 / Accepted: 15 October 2019 / Published: 25 October 2019
(This article belongs to the Section Viruses of Plants, Fungi and Protozoa)
Southern rice black-streaked dwarf virus (SRBSDV), which causes severe disease symptoms in rice (Oriza sativa L.) has been emerging in the last decade throughout northern Vietnam, southern Japan and southern, central and eastern China. Here we attempt to quantify the prevalence of SRBSDV in the Honghe Hani rice terraces system (HHRTS)—a Chinese 1300-year-old traditional rice production system. We first confirm that genetically diverse rice varieties are still being cultivated in the HHRTS and categorize these varieties into three main genetic clusters, including the modern hybrid varieties group (MH), the Hongyang improved modern variety group (HY) and the traditional indica landraces group (TIL). We also show over a 2-year period that SRBSDV remains prevalent in the HHRTS (20.1% prevalence) and that both the TIL (17.9% prevalence) and the MH varieties (5.1% prevalence) were less affected by SRBSDV than were the HY varieties (30.2% prevalence). Collectively we suggest that SRBSDV isolates are freely moving within the HHRTS and that TIL, HY and MH rice genetic clusters are not being preferentially infected by particular SRBSDV lineages. Given that SRBSDV can cause 30–50% rice yield losses, our study emphasizes both the need to better monitor the disease in the HHRTS, and the need to start considering ways to reduce its burden on rice production. View Full-Text
Keywords: Southern rice black-streaked dwarf virus; rice; Honghe Hani rice terraces system; host genotyping; virus prevalence; virus emergence Southern rice black-streaked dwarf virus; rice; Honghe Hani rice terraces system; host genotyping; virus prevalence; virus emergence
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Alonso, P.; Gladieux, P.; Moubset, O.; Shih, P.-J.; Mournet, P.; Frouin, J.; Blondin, L.; Ferdinand, R.; Fernandez, E.; Julian, C.; Filloux, D.; Adreit, H.; Fournier, E.; Ducasse, A.; Grosbois, V.; Morel, J.-B.; Huang, H.; Jin, B.; He, X.; Martin, D.P.; Vernière, C.; Roumagnac, P. Emergence of Southern Rice Black-Streaked Dwarf Virus in the Centuries-Old Chinese Yuanyang Agrosystem of Rice Landraces. Viruses 2019, 11, 985.

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