The integration QTL map for gray leaf spot resistance in maize was constructed by compiling a total of 57 QTLs available with genetic map IBM2 2005 neighbors as reference. Twenty-six ＂real QTLs＂ and seven consensus ...The integration QTL map for gray leaf spot resistance in maize was constructed by compiling a total of 57 QTLs available with genetic map IBM2 2005 neighbors as reference. Twenty-six ＂real QTLs＂ and seven consensus QTLs were identified by refining these 57 QTLs using overview and meta-analysis approaches. Seven consensus QTLs were found on chromosomes 1.06, 2.06, 3.04, 4.06, 4.08, 5.03, and 8.06, and the map coordinates were 552.53,425.72, 279.20, 368.97, 583.21, 308.68 and 446.14 cM, respectively. Using a synteny conservation approach based on comparative mapping between the maize genetic map and rice physical map, a total of 69 rice and maize resistance genes collected from websites Gramene and MaizeGDB were projected onto the maize genetic map IBM2 2005 neighbors, and 2 （Rgene32, htl）, 4 （RgeneS, rp3, scmv2, wsm2）, and 4 （ht2, Rgene6, Rgene8 and Rgene7） positional candidate genes were found in three consensus QTLs on chromosomes 2.06, 3.04, and 8.06, respectively. The results suggested that the combination of meta-analysis of gray leaf spot in maize and sequence homologous comparison between maize and rice could be an efficient strategy for identifying major QTLs and corresponding candidate genes for the gray leaf spot.展开更多
【目的】结合已克隆抗病基因的分子标记,对来自陕A群、陕B群的30份核心自交系和18份国内外优良种质进行抗病性鉴定,为玉米抗病育种奠定基础。【方法】2019年、2020年分别在陕西省不同地点开展茎腐病、穗腐病、大斑病和小斑病的田间接种...【目的】结合已克隆抗病基因的分子标记,对来自陕A群、陕B群的30份核心自交系和18份国内外优良种质进行抗病性鉴定,为玉米抗病育种奠定基础。【方法】2019年、2020年分别在陕西省不同地点开展茎腐病、穗腐病、大斑病和小斑病的田间接种鉴定,以及灰斑病的田间自然发病鉴定。试验采用随机区组设计,每个试验设置2—3个重复。采用苗期高粱粒接种法接种大斑病和小斑病,在乳熟后期,对大斑病、小斑病和灰斑病进行病情分级鉴定;在玉米抽雄期,采用土埋伤根法接种禾谷镰孢茎腐病,生理成熟后进行劈茎调查;采用花丝通道和针刺果穗接种法,分2次接种禾谷镰孢穗腐病,玉米生理成熟后进行调查。分别计算不同病害病情指数的最佳线性无偏预测(best linear unbiased predictions,BLUPs),并分析两两病害之间的相关性。对已克隆抗病基因进行功能分子标记基因型鉴定。【结果】对48份自交系开展5种病害田间鉴定,筛选到9份高抗大斑病自交系、2份高抗小斑病自交系、10份抗灰斑病自交系、5份高抗禾谷镰孢茎腐病自交系和5份抗禾谷镰孢穗腐病自交系。1145、CML170、KA103等8份自交系兼抗3种叶斑病。对5种病害综合抗性表现优良的材料有7份,包括1145、CML170、KA105、KB020、X178、沈137和郑58。5种病害相关性分析发现,禾谷镰孢茎腐病与3种叶斑病抗性呈极显著正相关,与穗腐病抗性无相关性。对已知抗病基因鉴定表明,1145、KA081和沈137携带抗禾谷镰孢茎腐病的qRfg1位点,KB109携带抗炭疽茎腐病的Rcg1位点,带有抗大斑病基因Htn1和多抗小斑病、灰斑病基因ZmCCoAOMT2的材料较多。【结论】1145、CML170、KA105、KB020、X178、沈137和郑58对5种病害综合抗性表现良好,可作为供体亲本进行自交系的综合抗性改良。沈137携带抗病的qRfg1、Htn1和ZmCCoAOMT2等位基因,可用于分子标记辅助改良。展开更多
利用多花黑麦草叶斑病抗性和敏感个体杂交构建F 1分离群体,采用分群分析法(bu lked segregan t ana lys is,BSA),通过多花黑麦草表达序列标签(expressed sequence tag,EST)的PCR扩增和扩增产物的限制性内切酶酶切多态性(cleaved am p li...利用多花黑麦草叶斑病抗性和敏感个体杂交构建F 1分离群体,采用分群分析法(bu lked segregan t ana lys is,BSA),通过多花黑麦草表达序列标签(expressed sequence tag,EST)的PCR扩增和扩增产物的限制性内切酶酶切多态性(cleaved am p lified po lym orph ic sequence,CAPS)筛选,获得一个同多花黑麦草草抗叶斑病紧密连锁的EST-CAPS标记p56。对照多花黑麦草细胞质雄性不育(CM S)群体构建的遗传连锁图,该EST-CAPS标记位于多花黑麦草的第5遗传连锁群(LG 5)。对cDNA文库中对应于标记位点p56的EST序列片段分析和基因库搜索结果表明,该EST所编码的氨基酸序列同大麦天冬酰胺合成酶基因H vAS 1和H vAS 2的部分氨基酸序列片段同源性很高,推测位点p56所处的基因为编码多花黑麦草天冬酰胺合成酶基因。该分子标记可用于多花黑麦草分子标记辅助育种。展开更多
文摘The integration QTL map for gray leaf spot resistance in maize was constructed by compiling a total of 57 QTLs available with genetic map IBM2 2005 neighbors as reference. Twenty-six ＂real QTLs＂ and seven consensus QTLs were identified by refining these 57 QTLs using overview and meta-analysis approaches. Seven consensus QTLs were found on chromosomes 1.06, 2.06, 3.04, 4.06, 4.08, 5.03, and 8.06, and the map coordinates were 552.53,425.72, 279.20, 368.97, 583.21, 308.68 and 446.14 cM, respectively. Using a synteny conservation approach based on comparative mapping between the maize genetic map and rice physical map, a total of 69 rice and maize resistance genes collected from websites Gramene and MaizeGDB were projected onto the maize genetic map IBM2 2005 neighbors, and 2 （Rgene32, htl）, 4 （RgeneS, rp3, scmv2, wsm2）, and 4 （ht2, Rgene6, Rgene8 and Rgene7） positional candidate genes were found in three consensus QTLs on chromosomes 2.06, 3.04, and 8.06, respectively. The results suggested that the combination of meta-analysis of gray leaf spot in maize and sequence homologous comparison between maize and rice could be an efficient strategy for identifying major QTLs and corresponding candidate genes for the gray leaf spot.
文摘【目的】结合已克隆抗病基因的分子标记,对来自陕A群、陕B群的30份核心自交系和18份国内外优良种质进行抗病性鉴定,为玉米抗病育种奠定基础。【方法】2019年、2020年分别在陕西省不同地点开展茎腐病、穗腐病、大斑病和小斑病的田间接种鉴定,以及灰斑病的田间自然发病鉴定。试验采用随机区组设计,每个试验设置2—3个重复。采用苗期高粱粒接种法接种大斑病和小斑病,在乳熟后期,对大斑病、小斑病和灰斑病进行病情分级鉴定;在玉米抽雄期,采用土埋伤根法接种禾谷镰孢茎腐病,生理成熟后进行劈茎调查;采用花丝通道和针刺果穗接种法,分2次接种禾谷镰孢穗腐病,玉米生理成熟后进行调查。分别计算不同病害病情指数的最佳线性无偏预测(best linear unbiased predictions,BLUPs),并分析两两病害之间的相关性。对已克隆抗病基因进行功能分子标记基因型鉴定。【结果】对48份自交系开展5种病害田间鉴定,筛选到9份高抗大斑病自交系、2份高抗小斑病自交系、10份抗灰斑病自交系、5份高抗禾谷镰孢茎腐病自交系和5份抗禾谷镰孢穗腐病自交系。1145、CML170、KA103等8份自交系兼抗3种叶斑病。对5种病害综合抗性表现优良的材料有7份,包括1145、CML170、KA105、KB020、X178、沈137和郑58。5种病害相关性分析发现,禾谷镰孢茎腐病与3种叶斑病抗性呈极显著正相关,与穗腐病抗性无相关性。对已知抗病基因鉴定表明,1145、KA081和沈137携带抗禾谷镰孢茎腐病的qRfg1位点,KB109携带抗炭疽茎腐病的Rcg1位点,带有抗大斑病基因Htn1和多抗小斑病、灰斑病基因ZmCCoAOMT2的材料较多。【结论】1145、CML170、KA105、KB020、X178、沈137和郑58对5种病害综合抗性表现良好,可作为供体亲本进行自交系的综合抗性改良。沈137携带抗病的qRfg1、Htn1和ZmCCoAOMT2等位基因,可用于分子标记辅助改良。
文摘利用多花黑麦草叶斑病抗性和敏感个体杂交构建F 1分离群体,采用分群分析法(bu lked segregan t ana lys is,BSA),通过多花黑麦草表达序列标签(expressed sequence tag,EST)的PCR扩增和扩增产物的限制性内切酶酶切多态性(cleaved am p lified po lym orph ic sequence,CAPS)筛选,获得一个同多花黑麦草草抗叶斑病紧密连锁的EST-CAPS标记p56。对照多花黑麦草细胞质雄性不育(CM S)群体构建的遗传连锁图,该EST-CAPS标记位于多花黑麦草的第5遗传连锁群(LG 5)。对cDNA文库中对应于标记位点p56的EST序列片段分析和基因库搜索结果表明,该EST所编码的氨基酸序列同大麦天冬酰胺合成酶基因H vAS 1和H vAS 2的部分氨基酸序列片段同源性很高,推测位点p56所处的基因为编码多花黑麦草天冬酰胺合成酶基因。该分子标记可用于多花黑麦草分子标记辅助育种。
