抗源望水白赤霉病抗性遗传分析和QTL定位研究
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摘要
以小麦赤霉病抗源望水白与感病品种安农8455和Alondra构建的重组自交系为材料,运用主基因+多基因模型进行抗性遗传分析,并以望水白/安农8455的RIL群体进行与赤霉病抗性连锁的SSR(简单重复序列)分子标记筛选及QTL(数量性状位点)定位,获得如下结果:
    抗源望水白赤霉病抗性遗传分析
    抗源望水白抗性由2对主基因控制,且符合两对主基因+多基因模型。2001年、03年、04年望水白/安农8455抗性分别符合E-2-6模型(两对主基因+多基因的加性-加性模型)、E-1-8模型(两对主基因+多基因,主基因间为重叠作用)、E-1-8模型(两对主基因+多基因,主基因间为重叠作用)。主基因的遗传率较高分别为63.8%、69.02%、73.66%,多基因的遗传率分别为13.94%、21.38%、16.80%。2003年望水白/Alondra抗性符合E-1-9模型(两对主基因+多基因,主基因间为相互抑制作用)。主基因的遗传率为85.18%,多基因的遗传率较低为2.74%。
    望水白/安农8455群体的SSR标记
    在望水白/安农8455群体的抗感亲本间的引物筛选表明,多态性为33%。根据群体的SSR标记,在2001年、03年和04年3年中至少有2年资料表明与抗赤性连锁的SSR标记有14个,定位在3B、2A、2B和5D染色体上。已经发表的资料表明,在望水白/Alondra群体中至少两次鉴定资料中都出现的与抗赤基因连锁的SSR标记共有8个,定位在3B、4B、2D、4D染色体上。
    3. 抗源望水白的QTL定位
    通过构建望水白/安农8455群体的连锁图,把25个SSR标记定位在5条染色体上。2001年、03年和04年的抗性资料表明在抗源的3B染色体上存在一个QTL。2001年和03年的抗性资料表明在2A上存在一个抗性QTL。根据2001年、03年和04年的抗性资料分析3B上的QTL分别位于Xgwm533.1-Barc133、 Xgwm389-Xgwm533.1、 Xgwm533.1-Barc133之间,LOD值为2.47、5.57、2.52,能解释10.56%、21.97%、8.37%的表型变异。2001年和03年的抗性资料分析2A上抗性QTL,都位于Xgwm425-Xgwm372之间,LOD值分别为2.5、2.80,能解释9.76%、11.04%。已发表的望水白/Alondra群体中抗源望水白的3B染色体上存在抗性QTL,位于Barc147-Xgwm493之间,能解释13.7%的表型变异。
    
    对抗源望水白的抗性进行遗传分析,得出其抗赤性为两对主基因控制,有助于对抗源抗性机制的理解。运用SSR标记技术,获得与抗赤性连锁的遗传标记,在抗源望水白3B染色体上存在抗性QTL,为抗赤性分子标记辅助育种及最终克隆抗病基因奠定基础。
The RIL populations of Wangshuibai /annong8455 and Wangshuibai/Alondra to wheat scab were analysised with major gene plus ploygenes. The SSR(simple sequence repeat) marker analysis and QTL(quantitative trait loci) tagging of wheat scab resistance were carried out with the population of Wangshuibai/Annong8455.The results showed as follows:
    the genetic analysis of Wangshuibai to scab
     The scab resisitance of Wangshubai fits the genetic model of two major genes plus polygenes. The RIL populations of Wangshuibai /annong8455 to scab in 2001,2003 and 2004 fits the model of E-2-6(two major genes plus polygenes with additive –epistatic effect), the model of E-1-8(two major genes plus polygenes with effect) and the model of E-1-8. The heritability of major genes is 63.8%,69.02% and 73.66%.The heritability of polygenes is 13.94%,21.38% and 16.08%. The RIL populations of Wangshuibai /Alondra to scab in 2003 fits the model of E-1-9(two major genes plus polygenes with effect).The heritability of major genes is 85.18%.The heritability of polygenes is 2.74%.
    the SSR marker linked to scab in the RIL population of Wangshuibai/annong8455
    78 SSR primers have polymorphism between Wangshuibai and Annong8455 when the 236 microsatellite primers are screened. The polymorphism is 33%.There are 14 SSR markers linked to scab in the two of three experimental years(2001,2003 and 2004).They are locused on chromosome 3B,2A,2B and 5D. There are 8 SSR markers linked to scab in the RIL population of Wangshuibai /Alondra. This is published. They are at least in the two of all phenotypes and are locused on chromosome 3B,4B,2D and 4D.
    the tagging of QTL for Wangshuibai for wheat scab
     The linked map of the RIL population of Wangshuibai/annong8455 is constructed. There are 25 markers in the linked map and are locused on 5 chromosomes. There is respectively one QTL on chromosome 3B in 2001 ,2003 and 2004.The QTLs on chromosome 3B are respectively between the primer Xgwm533.1 and Barc133, the
    
    
    primer Xgwm389 and Xgwm533.1 and the primer Xgwm533.1 and Barc133.
     The LOD values are respectively 2.47, 5.57and 2.52.They can explain 10.56% , 21.97% and 8.37%of the phenotypic variations of the scab. There is respectively one QTL on chromosome2A.The QTL on chromosome 2A is both between the primer Xgwm425 and Xgwm372.The LOD values are 2.5 and 2.80.They can explain 9.76% and 11.04% of the phenotypic variations of the scab. There is one QTL on chromosome 3B in the RIL population of Wangshuibai/Alondra. It has been published.The QTL is between Barc147 and Xgwm493 and can explain 13.7 % of the phenotypic variations.
    The resistance to scab of Wangshuibai fits the model of two major genes and plus polygene. This helps to know the resistant to scab of Wangshuibai. The linked markers of scab-resistance is searched .There is one QTL on chromosome 3B of Wangshuibai. This is benefits to molecular breeding and is foundation to the clone of the genes to resistant to disease.
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