作物学报 ›› 2017, Vol. 43 ›› Issue (05): 658-668.doi: 10.3724/SP.J.1006.2017.00658
佘东1,刘强明1,2,李大露1,梁银凤1,刘二宝1,党小景1,洪德林1,*
SHE Dong1,LIU Qiang-Ming1,2,LI Da-Lu1,LIANG Yin-Feng1,LIU Er-Bao1,DANG Xiao-Jing1,HONG De-Lin1,*
摘要:
为发掘水稻穗部性状有利等位变异,构建了以籼稻保持系II-32B为遗传背景的A7444染色体片段置换系群体;利用QTL IciMapping 4.1软件对该群体7个穗部性状进行了QTL定位。结果2年共检测到26个QTL。2年均检测到的13个QTL中,控制一次枝梗数的4个QTL位于第1、第6、第8和第9染色体,平均贡献率分别为15.16%、13.1%、29.74%和11.21%,平均加性效应分别为?1.40、1.01、1.11和0.77。控制二次枝梗数的2个QTL位于第6和第8染色体,平均贡献率分别为10.97%和21.39%,平均加性效应分别为5.45和6.36。控制每穗总粒数的3个QTL位于第2、第6和第8染色体,平均贡献率分别为8.65%、12.52%和31.22%,平均加性效应分别为?18.61、22.23和31.87。控制每穗实粒数的1个QTL位于第8染色体,平均贡献率为28.06%,平均加性效应30.85。控制千粒重的2个QTL位于第2染色体,平均贡献率分别为44.65%和17.51%,平均加性效应分别为2.88和?2.51。控制粒宽的1个QTL位于第10染色体,平均贡献率为21.96%,平均加性效应为0.11。第2、第6和第8染色体分别存在同时控制二次枝梗数、每穗总粒数和每穗实粒数QTL的区段。QTL qSBN6和qSBN8所在区间与Hd1和DTH8的相同,但分别存在16处和1处碱基差异,推测为Hd1和DTH8的不同等位基因。qSBN2为新检测到的控制二次枝梗数位点。研究结果为实施分子标记聚合育种提供了有用信息。
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