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抗条锈病基因YrCH5026的遗传分析及分子定位

DOI: 10.7668/hbnxb.2015.05.002, PP. 7-15

Keywords: 小麦,中间偃麦草,渗入系,条锈病,分子定位

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Abstract:

CH5026是携带中间偃麦草抗病基因的渗入系。为了更好地利用CH5026,拓宽小麦抗性育种资源,对其抗条锈性来源和遗传模式进行了分析,对抗性基因进行了染色体定位并构建了遗传连锁图谱。在苗期和成株期对CH5026及其亲本分别接种条锈菌流行小种CYR31、CYR32和CYR33。结果表明,CH5026在苗期和成株期对这3个条锈菌小种均表现出免疫或近免疫,且与其抗性供体TAI7045及其野生亲本中间偃麦草抗病侵染型相似。对其与感病品种(系)的杂交后代F1、F2、F2:3和BC1群体接种CYR32进行成株期抗性遗传机制分析,证实CH5026对CYR32的抗性由1对显性核基因控制。基因组原位杂交未检测到外源DNA杂交信号。用569对SSR引物对CH5026/台长29的192个F2群体进行分析,发现3个与抗性基因连锁的SSR标记:Xgwm210、Xwmc382和Xgpw7101,抗性基因位点与两翼邻近连锁标记Xwmc382和Xgpw7101的遗传距离分别为6.0,4.7cM。利用中国春缺四体、双端体材料将该基因及其连锁标记定位在染色体2AS上。通过基因来源及连锁分子标记多态性比较,这个抗条锈病基因与已知定位于染色体2AS上的抗性基因不同,很可能是一个新的抗条锈病新基因,暂将其命名为YrCH5026。

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