Journal
BREEDING SCIENCE
Volume 63, Issue 3, Pages 301-308Publisher
JAPANESE SOC BREEDING
DOI: 10.1270/jsbbs.63.301
Keywords
rice sheath blight resistance; Oryza sativa L.; QTL; chromosomal segment substitution line; CSSL; Rhizoctonia solani
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Funding
- Ministry of Agriculture, Forestry and Fisheries of Japan (Genomics for Agricultural Innovation) [QTL-2003]
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Sheath blight, caused by Rhizoctonia solani, is one of the most serious diseases of rice. Among 33 rice accessions, mainly from National Institute of Agrobiological Sciences (NIAS) Core Collection, we found three landraces from the Himalayas-Jarjan, Nepal 555 and Nepal 8-with resistance to sheath blight in 3 years' field testing. Backcrossed inbred lines (BILs) derived from a cross between Jarjan and the leading Japanese cultivar Koshihikari were used in QTL analyses. Since later-heading lines show fewer lesions, we used only earlier-heading BILs to avoid association with heading date. We detected eight QTLs; the Jarjan allele of three of these increased resistance. Only one QTL, on chromosome 9 (between markers Nag08KK18184 and Nag08KK18871), was detected in all 3 years. Chromosome segment substitution lines (CSSLs) carrying it showed resistance in field tests. Thirty F-2 lines derived from a cross between Koshihikari and one CSSL supported the QTL.
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