利用染色体单片段代换系定位水稻穗粒数 QTL

摘要

以85个单片段代换系为材料，其受体亲本为广陆矮4号，供体亲本为日本晴。通过单因素方差分析和Dunnett′s多重比较，分析单片段代换系与受体亲本之间穗粒数的差异，对代换片段上的穗粒数QTL进行鉴定。以P≤0．001为阈值共检测到27个穗粒数QTLs，分布于除第10染色体外的其他11条染色体上。其中，2个QTLs的加性效应表现为减效作用，另外25个穗粒数QTLs的加性效应表现为增效作用。其加性效应值的变化范围为-37．5～96.9，加性效应百分率的变化范围为-29．07％～88．57％。为进一步发掘和利用新的水稻穗粒数QTL奠定基础。%Grain number is one of the important components of rice yield which is a typical quantitative trait and can easily be influenced by genetic background and environmental factors .Single segment substitution lines ( SSSLs) can effectively reduce the interference of the genetic background .We developed a set of genome-wide SSSLs carrying Nipponbare introgression segments in the background of Guangluai 4.Quantitative trail loci ( QTL) analysis involved one-way ANOVA and Dunnett′s test for comparing SSSLs with the recurrent parent Guangluai 4 ( P≤0 .001 ) .We detected 27 QTLs for grain number distributed on 11 rice chromosomes ,except chromosome 10 ,of which 2 had negative effect and the others positive effect .The additive effect of these QTLs ranged from -37 .5 to 96 .6 ,with additive effect percentages -29 .07%to 88 .57%.These results provide useful information for exploring and using new grain number related resources .