| In this study, a set of recombinant inbred line (RIL) population derived from a cross of two early-season rice varieties996and4628, was developed to identify quantitative trait loci (QTL) for yield-related traits. The main research results are as the following:1. The parent996,4628and the RILs population which containing286lines were planted both in the middle season of2011and early season of2012, respectively. Nine yield-related traits including plant height, panicle length, panicle number per plant, total grain number per panicle, grain per panicle, seed setting percentage, primary branch number per panicle, secondary branch number per panicle and1000-grain weight weight were investigated in both growth environments. Normal distribution and transgressive segregation were observed for all the traits in the RILs. The results showed that all the yield-related traits were controlled by quantitative trait loci.2. The eight yield-related traits including plant height, panicle length, panicle number per plant, total grain number per panicle, grain per panicle, seed setting percentage, primary branch number per panicle and secondary branch number per panicle were related to each other. Significantly correlations were observed in most of these traits.3. QTL analysis was carried out for all yield-related traits with composite interval mapping method by using WinQTL Cartographer2.5. Seventy-two QTLs associated with yiled-related traits, which distributed on chromosome1,2,3,4,5,6,7,10and12, were detected in the996/4628RILs. Among them,34and38QTLs were detected in2011and2012, respectively. Nine stable QTLs, which were repetedly detected in both2011and2012, provided a basis for further fine mapping the gene of yield-related traits... |
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