Genome-Wide Association Analysis of the Genetic Basis for Sheath Blight Resistance in Rice

Background Sheath blight (ShB), caused by Rhizoctonia solani Kühn, is one of the most destructive rice diseases. Developing ShB-resistant rice cultivars represents the most economical and environmentally sound strategy for managing ShB. Results To characterize the genetic basis for ShB resistance in...

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Published in:Rice (New York, N.Y.) N.Y.), 2019-12, Vol.12 (1), p.93-13, Article 93
Main Authors: Zhang, Fan, Zeng, Dan, Zhang, Cong-Shun, Lu, Jia-Ling, Chen, Teng-Jun, Xie, Jun-Ping, Zhou, Yong-Li
Format: Article
Language:English
Subjects:
Agriculture
Association analysis
Bioinformatics
Biomedical and Life Sciences
Blight
Cultivars
Disease resistance
Genetic analysis
Genomes
Germplasm
GWAS
Lesions
Life Sciences
Original
Original Article
Plant Breeding/Biotechnology
Plant Ecology
Plant Genetics and Genomics
Plant Sciences
Rice
Sheath blight
Sheath blight resistance
Sheaths
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Summary:Background Sheath blight (ShB), caused by Rhizoctonia solani Kühn, is one of the most destructive rice diseases. Developing ShB-resistant rice cultivars represents the most economical and environmentally sound strategy for managing ShB. Results To characterize the genetic basis for ShB resistance in rice, we conducted association studies for traits related to ShB resistance, namely culm length (CL), lesion height (LH), and relative lesion height (RLH). Combined a single locus genome-wide scan and a multi-locus method using 2,977,750 single-nucleotide polymorphisms to analyse 563 rice accessions, we detected 134, 562, and 75 suggestive associations with CL, LH, and RLH, respectively. The adjacent signals associated with RLH were merged into 27 suggestively associated loci (SALs) based on the estimated linkage disequilibrium blocks. More than 44% of detected RLH-SALs harboured multiple QTLs/genes associated with ShB resistance, while the other RLH-SALs were putative novel ShB resistance loci. A total of 261 ShB resistance putative functional genes were screened from 23 RLH-SALs according to bioinformatics and haplotype analyses. Some of the annotated genes were previously reported to encode defence-related and pathogenesis-related proteins, suggesting that quantitative resistance to ShB in rice is mediated by SA- and JA-dependent signalling pathways. Conclusions Our findings may improve the application of germplasm resources as well as knowledge-based ShB management and the breeding of ShB-resistant rice cultivars.
ISSN:1939-8425
1939-8433
1934-8037
DOI:10.1186/s12284-019-0351-5