作物学报 ›› 2016, Vol. 42 ›› Issue (10): 1437-1447.
陈天晓1,2,朱亚军3,密雪飞3,陈凯3,孟丽君3,左示敏1,*,徐建龙2,3,4,*
CHEN Tian-Xiao1,2, ZHU Ya-Jun3, MI Xue-Fei3, CHEN Kai3, MENG Li-Jun3, ZUO Shi-Min1,*, and XU Jian-Long2,3,4,*
摘要:
以8个不同亲本构建的遗传上相互关联的多亲本高代互交系(multi-parents advanced generation inter-cross, MAGIC)群体,包括2个4亲本群体(DC1和DC2)和1个8亲本群体(DC3)为材料,接种我国白叶枯病强致病力V型菌系(GD-V)和弱致病力II型菌系(C2),关联分析定位MAGIC群体对白叶枯病的抗性QTL,筛选抗病种质。结果表明,大多数亲本对C2菌系表现抗病,而对GD-V表现感病,3个MAGIC群体的病斑长度均出现超亲分离。共检测到7个白叶枯病抗性QTL,大多表现数量抗性,而且抗性QTL表达存在明显的遗传背景效应。QBbr11-1和QBbr11-2受遗传背景影响较小,具有一定的育种应用价值。从3个群体筛选出8份不同抗病QTL聚合的抗病材料,表明质量抗性基因和水平抗性数量性状位点的结合可以显著提高抗性水平。8份不同抗病QTL的聚合系可以用作抗病育种的中间抗源。研究结果表明,MAGIC群体可以将遗传研究和育种应用有机结合,是遗传研究和开展标记辅助育种的理想群体。
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