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Genetic bases of resistance to the rice hoja blanca disease deciphered by a QTL approach

Genetic bases of resistance to the rice hoja blanca disease deciphered by a QTL approach

来源:bioRxiv_logobioRxiv
英文摘要

Abstract Rice hoja blanca (RHB) is one of the most serious diseases in rice growing areas in tropical Americas. Its causal agent is Rice hoja blanca virus (RHBV), transmitted by the planthopper Tagosodes orizicolus Müir. Genetic resistance is the most effective and environment-friendly way of controlling the disease. So far, only one major quantitative trait locus (QTL) of Oryza sativa ssp. japonica origin, qHBV4.1, that alters incidence of the virus symptoms in two Colombian cultivars has been reported. This resistance has already started to be broken, stressing the urgent need for diversifying the resistance sources. In the present study we performed a search for new QTLs of O. sativa indica origin associated with RHB resistance. We used four F2:3 segregating populations derived from indica resistant varieties crossed with a highly susceptible japonica pivot parent. Beside the standard method for measuring disease incidence, we developed a new method based on computer-assisted image processing to determine the affected leaf area (ALA) as a measure of symptom severity. Based on the disease severity and incidence scores in the F3 families under greenhouse conditions, and SNP genotyping of the F2 individuals, we identified four new indica QTLs for RHB resistance on rice chromosomes 4, 6 and 11, namely qHBV4.2WAS208, qHBV6.1PTB25, qHBV11.1 and qHBV11.2. We also confirmed the wide-range action of qHBV4.1. Among the five QTLs, qHBV4.1 and qHBV11.1 had the largest effects on incidence and severity, respectively. These results provide a more complete understanding of the genetic bases of RHBV resistance in the cultivated rice gene pool, and can be used to develop marker-aided breeding strategies to improve RHB resistance. The power of joint-and meta-analyses allowed precise mapping and candidate gene identification, providing the basis for positional cloning of the two major QTLs qHBV4.1 and qHBV11.1.

Silva Alexander、Montoya Mar¨aa Elker、Quintero Constanza、Cuasquer Juan、Tohme Joe、Graterol Eduardo、Cruz Maribel、Lorieux Mathias

Alliance Bioversity-CIATFLAR-Fondo Latinoamericano para Arroz de RiegoAlliance Bioversity-CIATAlliance Bioversity-CIATAlliance Bioversity-CIATFLAR-Fondo Latinoamericano para Arroz de RiegoFLAR-Fondo Latinoamericano para Arroz de RiegoAlliance Bioversity-CIAT||University of Montpellier

10.1101/2022.11.07.515427

植物保护遗传学农作物

Rice hoja blanca virus (RHBV)Rice hoja blanca disease (RHB)Quantitative trait locus (QTL)candidate gene

Silva Alexander,Montoya Mar¨aa Elker,Quintero Constanza,Cuasquer Juan,Tohme Joe,Graterol Eduardo,Cruz Maribel,Lorieux Mathias.Genetic bases of resistance to the rice hoja blanca disease deciphered by a QTL approach[EB/OL].(2025-03-28)[2025-04-26].https://www.biorxiv.org/content/10.1101/2022.11.07.515427.点此复制

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