关键词: 水稻, 单片段代换系, 数量性状基因座, 农艺性状

Abstract: 【Objective】QTL detection using Single segment substitution lines（SSSLs）overcame the limitations of conventional mapping populations and were utilized easily in breeding. Single segment substitution lineswith only single chromosome segment from a donor under the same genetic background as the recipient each were developed by advanced backcrossing and molecular marker-assisted selection. 【Method】Detection of the QTLs controlling 23 important traits in rice was done with 32 SSSLs by the randomized blocks design. 【Result】Fifty-nine QTLs were detected and distributed on chromosomes 1,2,3,4,6,7,8,10,11, of which 18 QTLs were detected two times or more. Only 30.5% of the QTLs were detected repeatly in different cropping seasons . Most QTLs of agronomic importance were of little effects and unstable. The QTLs controlling the traits such as grain weight, grain length, ratio of grain length to width and heading date were relatively stable. The stable QTLs usually had larger additive effects and less affected by environment. The unstability of QTLs of agronomy importance may be the genetic basis for improving yield and quality in rice by culture methods.

Key words: Rice, Single segment substitution line, Quantitative trait locus