大田环境下小麦自然群体的赤霉病抗性、显著关联的标记及其有效等位变异

来源 :第七届全国小麦遗传育种学术研讨会 | 被引量 : 0次 | 上传用户:sunrisekarl
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截至目前,通过构建双亲本衍生的分离群体和QTL 作图,在小麦21 条染色体上均有赤霉病抗性QT 定位的报道.但是相当一部分与已知QTL 关联的标记在不同遗传背景品种构成的自然群体中难以重现,尤其是在大田环境下更是如此,一是因为大田环境下表型的变异较大,鉴定误差掩盖了本来就小的QTL 效应;二是因为育种群体经过多代的选择和积累的历史重组事件,使得QTL 区域的序列变异较为丰富,因此只有与QTL 紧密关联的标记才能在自然群体中检出,且往往存在两个以上的等位变异.
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