Abstract: The culm length, panicle length, spikelets per panicle and panicle exsertion were evaluated by using F2:3 population including 200 lines, derived from a cross of indica and japonica Milyang23/Jileng1 under five different environments of Beijing (natural normal growing environment), Kunming (natural low temperature condition), Gongzhuling of China (cold water irrigation) and Chuncheon of Korea (natural normal growing environment and cold water irrigation), and QTLs of these traits were analysed by using SSR markers. The results showed that 44 QTLs related to these agronomic traits were detected under five different growing environments, and these QTLs are located on eleven charomosomes except chromosome 9. The QTLs for qCL1a, qCL1b, qCL5a, qCL6b, qPL1a, qPL3a, qPL6b, qPL6c, qPL7b, qSP8b, qSP1c, qSP11a, qSP12 and qPE1 have been detected in more than two growing environments, which were little affected by environments, were stable QTLs. Among them, qCL1a, qCL1b, qPL1a, qSP1c and qPE1 explained 24.2%-55.2%, 22.7%-39.9%, 12.5%-27.7%, 14.4%-33.5% and 26.6%-28.7% of observed phynotypic variation, respectively, which were major genes mainly appeared over dominance. These QTLs cause the increase of culm length, panicle length, spikelets per panicle and panicle exsertion under low temperature, showing that these QTLs are correlated with cold tolerance.

Key words: Rice, Different growing environment, Agronomic traits, QTLs