Identification of QTLs for cold tolerance at the booting and flowering stages in rice (Oryza sativa L.)

Rice growth and productivity are greatly affected by cold stress, which is likely to become more of a hindrance for high stable rice yields. To identify tolerance at the booting flowering stages in rice, recombinant inbred line was developed crossing cold-tolerant japonica cultivated variety, Jileng1, with cold-sensitive indica Milyang23. The seed setting rate (SST) parents RIL population were investigated under different temperature environments, SST stress index natural low used evaluate quantitative trait locus (QTL) mapping. Fifteen QTLs detected on chromosomes 1, 2, 3, 5, 7, 11 12, log-likelihood values ranging from 2.64 4.76. These account 3.34% 12.02% phenotypic variance explained. Three QTLs, qCtb1, qCtb5 qCtb12, repeatedly conditions, they considered stably expressed QTLs. localized chromosome 5 marker between CMB0526.3 ID5014265. In this interval or nearby, many cold-resistance have been identified previous studies, so major cold-tolerance QTL. Thirteen environmental interactions also detected, single environment all found be involved interactions. results show that significant effect rice. Stable expression will help fine mapping genes provide gene resources cultivate varieties.