数字农科院2.0

Identification Of New Resistance Loci A.gainst Sheath Blight Disease I n Rice Through Genome-Wide Association Study

文献类型： 外文期刊

作者： Zhao Jianhua;Zhang Yafang;Zuo Shimin;Feng Zhiming;Liu Wende;Kang Houxiang;Gong Hongbing;Chen Xijun;Li Qianqian;Chen Zongxiang;Pan Xuebiao;Wang Guoliang;Zuo Shimin;Chen Tianxiao

作者机构：

关键词： genome-wide association study; quantitative trait locus; rice; sheath blight; plant height

期刊名称： RICE SCIENCE

ISSN： 1672-6308

年卷期： 2019 年 26 卷 1.0 期

页码：

收录情况： JCR（2021版） ; CSCD（2020-2021年度） ; 农林核心（2020版） ; 科技核心（2020版）

摘要： Sheath blight (SB) caused by the soil borne pathogen Rhizoctonia solani is one of the most serious global rice diseases. Breeding resistant cultivar is the most economical and effective strategy to control the disease. However, no rice varieties are completely resistant to SB, and only a few reliable quantitative trait loci (QTLs) linked with SB resistance have been identified to date. In this study, we conducted a genome-wide association study (GWAS) of SB resistance using 299 varieties from the rice diversity panel 1 (RDP1) that were genotyped using 44 000 high-density single nucleotide polymorphism (SNP) markers. Through artificial inoculation, we found that only 36.5% of the tested varieties displayed resistance or moderate resistance to SB. In particular, the aromatic and aus sub-populations displayed higher SB resistance than the tropical japonica (TRJ), indica and temperate japonica sub-populations. Seven varieties showed similar resistance levels to the resistant control YSBR1. GWAS identified at least 11 SNP loci significantly associated with SB resistance in the three independent trials, leading to the identification of two reliable QTLs, qSB-3 and qSB-6, on chromosomes 3 and 6. Using favorable alleles or haplotypes of significantly associated SNP loci, we estimated that both QTLs had obvious effects on reducing SB disease severity and can be used for enhancing SB resistance, especially in improving SB resistance of TRJ sub-population rice varieties. These results provided important information and genetic materials for developing SB resistant varieties through breeding.

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