Identification of broad-spectrum resistance QTLs against rice blast fungus and their application in different rice genetic backgrounds
SIRIPAR KORINSAK CHANAKARN WONGSAPROM WATCHAREEWAN JAMBOONSRI SAENGCHAI SRIPRAKHON KANYANAT SIRITHUNYA APICHART VANAVICHIT THEERAYUT TOOJINDA
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Rice blast disease is found worldwide leading to economic losses. Use of resistance gene is effective to improve rice resistance variety. Therefore, to deploy genomic regions harbouring resistance genes, a population of 587 F2:6 recombinant inbred lines (RILs) was developed from a cross between Jao Hom Nin, a Thai black rice variety with broad-spectrum resistance to blast disease, and Kao Dawk Mali 105, a susceptible Thai jasmine variety. The RILs were challenged with 17 blast isolates collected from Thailand and Laos PDR.Quantitative trait locus analysis identified genomic regions associated with broad-spectrum quantitative resistance (qBSRLs) and racespecific quantitative resistance (qRSRLs). Two qBSRLs were detected on chromosomes 1 and 11, and two qRSRLs were detected on chromosomes 8 and 12. The two qBSRLs were introgressed into two new genetic backgrounds through marker-assisted selection (MAS). Twelve breeding lines were tested for their spectra of resistance against 35 blast isolates. The results indicated that both qBSRLs wereeffective in new genetic backgrounds. The flanking markers and qBSRLs identified in the large mapping population showed high selection accuracy and effectiveness, suggesting the routine deployment of MAS technique in rice breeding programmes.
SIRIPAR KORINSAK1 CHANAKARN WONGSAPROM1 WATCHAREEWAN JAMBOONSRI1 SAENGCHAI SRIPRAKHON1 KANYANAT SIRITHUNYA2 APICHART VANAVICHIT3 THEERAYUT TOOJINDA1
Volume 102, 2023
Continuous Article Publishing mode
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