作物学报 ›› 2011, Vol. 37 ›› Issue (08): 1342-1350.doi: 10.3724/SP.J.1006.2011.01342
杨燕宇,杨盛强,陈哲红,官春云,陈社员,刘忠松
YANG Yan-Yu,YANG Sheng-Qiang,CHEN Zhe-Hong,GUAN Chun-Yun,CHEN She-Yuan,LIU Zhong-Song
摘要: 用无芥酸的高油酸油菜品系HOP和低油酸油菜品种湘油15为父母本构建含189单株的F2代作图群体。F2代单粒种子播种前采用半粒取样,F2代单株种子采用混合取样,进行脂肪酸含量的气相色谱分析。统计检测显示这两种方法测定结果极显著相关,各种脂肪酸含量之间大部分也呈显著相关。用该群体构建含342个SSR标记的遗传连锁图并对18碳不饱和脂肪酸含量进行了QTL定位。在A5和C5连锁群上各检测到1个油酸含量主效QTL,其中位于A5连锁群的QTL效应值较大,且与FAD2基因紧密连锁;位于C5连锁群的QTL为首次报道,与之紧密连锁的标记在A5 连锁群QTL区域有同源标记,说明可能与位于C5的FAD2基因有关。用两种方法测定性状值都能检测到这2个QTL,且效应值比较接近,共能解释60%~70%油酸含量变异。由于油酸含量与亚油酸之间高度相关,定位在A5和C5的油酸含量QTL也被确认为亚油酸含量主效QTL,但利用单株法测定的性状值能在A4连锁群上再发现1个LOD值较低的亚油酸含量QTL。两种测定法能比较一致地在A4、A5和C4连锁群上检测到3个亚麻酸含量主效QTL,共能解释72%~80%亚麻酸含量变异。用半粒法能在A4连锁群还能检测到1个解释变异度为12.42%的较小LOD值的亚麻酸含量QTL。
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