Emergence of southern rice black-streaked dwarf virus in the centuries-old Chinese Yuanyang agrosystem of rice landraces

Alonso Pascal, Gladieux Pierre, Moubset Oumaima, Shih Pei-Jung, Mournet Pierre, Frouin Julien, Blondin Laurence, Ferdinand Romain, Fernandez Emmanuel, Julian Charlotte, Filloux Denis, Adreit Henri, Fournier Elisabeth, Ducasse Aurélie, Grosbois Vladimir, Morel Jean-Benoit, Huang Huichuan, Jin Baihui, He Xiahong, Martin Darren Patrick, Vernière Christian, Roumagnac Philippe. 2019. Emergence of southern rice black-streaked dwarf virus in the centuries-old Chinese Yuanyang agrosystem of rice landraces. Viruses, 11 (11):985, 13 p.

Quartile : Q2, Sujet : VIROLOGY

Résumé : 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.

Mots-clés Agrovoc : Oryza sativa, Rice black-streaked dwarf virus, Reoviridae, virus des végétaux, culture en terrasse, variété indigène, génotypage

Mots-clés géographiques Agrovoc : Chine

Mots-clés complémentaires : Southern rice black-streaked dwarf virus (SRBSDV)

Mots-clés libres : Southern rice black-streaked dwarf virus, Rice, Honghe Hani rice terraces system, Host genotyping, Virus prevalence, Virus emergence

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Alonso Pascal, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-0018-5370
• Gladieux Pierre, INRA (FRA)
• Moubset Oumaima, INRA (FRA)
• Shih Pei-Jung, INRA (FRA)
• Mournet Pierre, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8011-8647
• Frouin Julien, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0003-1591-0755
• Blondin Laurence, CIRAD-BIOS-UMR BGPI (FRA)
• Ferdinand Romain, CIRAD-BIOS-UMR BGPI (FRA)
• Fernandez Emmanuel, CIRAD-BIOS-UMR BGPI (FRA)
• Julian Charlotte, CIRAD-BIOS-UMR BGPI (FRA)
• Filloux Denis, CIRAD-BIOS-UMR BGPI (FRA)
• Adreit Henri, CIRAD-BIOS-UMR BGPI (FRA)
• Fournier Elisabeth, INRA (FRA)
• Ducasse Aurélie, INRA (FRA)
• Grosbois Vladimir, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0003-1835-1434
• Morel Jean-Benoit, INRA (FRA)
• Huang Huichuan, Yunnan Agricultural University (CHN)
• Jin Baihui, CIRAD-BIOS-UMR BGPI (FRA)
• He Xiahong, Yunnan Agricultural University (CHN)
• Martin Darren Patrick, UCT (ZAF)
• Vernière Christian, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-2312-2073
• Roumagnac Philippe, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-5002-6039 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593885/)

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