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水稻稻瘟病广谱抗病新等位基因pi21t的鉴定及其抗性应用

DOI: 10.7668/hbnxb.2014.06.003, PP. 11-15

Keywords: 水稻,稻瘟病,广谱抗病,等位基因型

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Abstract:

为不断发掘和鉴定新的抗性基因,从而克隆和利用广谱持久抗性基因,选育水稻广谱抗稻瘟病新品种,解决稻瘟病危害。根据已克隆的水稻稻瘟病广谱抗病隐性等位基因pi21的序列设计分子标记Pi21-1,对育种上高频率使用的广亲和品种02428进行PCR扩增,测序比较分析发现了新的等位基因类型,同时对广亲和品种02428进行田间稻瘟病接种鉴定,苗期鉴定结果为免疫,从而鉴定了一个广谱抗稻瘟病的新等位基因pi21t,为水稻广谱抗稻瘟病育种提供了新的有利资源。通过分子标记辅助选择,能够快速明确目标品种中所携带目标基因的等位基因型,从而加快水稻广谱抗稻瘟病育种的进程,提高抗病效率。

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