期刊
BREEDING SCIENCE
卷 63, 期 3, 页码 339-346出版社
JAPANESE SOC BREEDING
DOI: 10.1270/jsbbs.63.339
关键词
white-back kernels; rice breeding; QTL; high temperature; heat-induced quality decline
资金
- Ministry of Agriculture, Forestry and Fisheries of Japan [QTL3002, QTL6001, 1202, 3003]
- Grants-in-Aid for Scientific Research [3003] Funding Source: KAKEN
Decline in the apparent quality of rice (Oryza sativa L.) grain due to high temperatures during ripening recently became a major concern in many areas in Japan. The occurrence of white-back kernels (WBK) is one of the main problems of heat-induced quality decline. We identified QTLs associated with the occurrence of WBK using recombinant inbred lines (RILs) and verified their effects using near-isogenic lines (NILs). The QTL analysis used F-7 and F-8 RILs derived from 'Hana-echizen' (HE), which is tolerant to high temperature, x 'Niigata-wase' (NW), which is sensitive to high temperature. Four QTLs were identified on chromosomes 3, 4, 6, and 9 (qWB3, qWB4, qWB6 and qWB9). To verify the effects of qWB6 and qWB9, we developed two NILs in which qWB6 or both were introduced from HE into the NW background. The HE allele at qWB6 significantly decreased WBK under multiple environments. The combination of qWB6 and qWB9 in an F-2 population derived from a cross between a NIL and NW showed that the NW allele at qWB9 significantly decreased WBK if the qWB6 allele was HE. These results will be of value in marker-assisted selection for the breeding of rice with tolerance to heat-induced quality decline.
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