Abstract: The recombinant inbred line population derived from Xieqingzao B/Milyang 46 and its genetic linkage map were used to map the QTLs controlling cooked rice elongation in two environments, Hainan and Hangzhou. The phenotypic performance and distribution were very similar in the two environments, but the correlation coefgicient was small between the two environments. Only one QTL was detected for cooked rice elongation, qCRE 6, with a positive additive effect 3.99% from the male parent and explaining 5.30% of the total phenotypic variations. No genotype-environmental interaction effect was detected for this QTL. Another two pairs of epistasis QTLs were detected, i.e. qCRE 2 vs qCRE 5-1 and qCRE 5-2 vs qCRE 7, the former one showed significant genotype-environmental interaction which increased cooked rice elongation in Hangzhou.

Key words: rice, recombinant inbred line population, quatitative trait loci, epistasis effect, genotype-environmental interaction effect, cooked rice elongation, rice quality

摘要： 利用协青早B/密阳46所构建的重组自交系群体及其相应分子遗传图谱，在海南和杭州两地试验，以延伸率作为米粒延伸性考察指标，检测QTL主效应、上位性效应和基因型×环境互作效应的遗传分析方法，进行联合检测分析。结果表明，该性状两地间的平均表现和群体分布特征较为相似，但两地间表型值相关系数却较小。试验检测到1个控制该性状的QTL基因qCRE 6,其增效基因来自于父本，提高3.99%的米粒延伸率，可解释5.30%的表型变异，它不存在与环境间显著互作。另外，还检测到2对上位性互作基因，即qCRE 2与qCRE 51、qCRE 52与qCRE 7,前者与环境间存在有显著的基因型×环境互作，在杭州有增加米粒延伸性的效果。

关键词: 水稻, 重组自交系, 数量性状座位, 上位性效应, 基因型×环境互作效应, 米粒延伸性