【作者】 康海岐； 陆贤军； 高方远； 姜华； 刘光春； 任光俊；

【Author】 KANG Hai-qi~(1,2) LU Xian-jun~1 GAO Fang-yuan~(1,2) JIANG Hua~3 LIU Guang-chun~1 REN Guang-jun~(1*) 1.Crop Research Institute,Sichuan Academy of Agricultural Sciences,Sichuan Chengdu 610066,China; 2.Life Science Academy of Sichuan University,Sichuan Chengdu 610000,China

【机构】 四川省农业科学院作物研究所；

【摘要】 对列入全球水稻分子育种计划的38个水稻供体品种及其与轮回亲本成恢448（CH448）不同回交后代的稻米廷伸性 （CRE）进行了测试和分析。因子分析结果表明,在38个供体亲本与轮回亲本 CH448的 BC₃F₂群体中,不同回交组合内稻米延伸性的变异有所不同;该世代各群体之间在 CRE 性状上的变异情况的不同之处,主要表现在主因子2（变异系数、最小值）和主因子3 （平均值、最大值）上;这主要取决于亲本组合的不同;在这38个 BC₃F₂群体中,CH4448分别与沈农365、冈46B 和 OM1706的亲本组合比较理想;选择适当的群体有利于 CRE 的 QTLs 聚合与遗传改良。在4个亲本（沈农365、x23、Palung 2和 x22）分别与轮回亲本 CH448的 BC₃F₂、BC₃F₃以及 Basmati370与 CH448的 BC₂F₃、BC₂F₄和 BC₂F₅群体中,随自交世代的增加,CRE 的变异趋势和幅度也随供体亲本不同而有所差异,CRE-OTLs 聚合程度与供体亲本有较大关系;自交有利于 CRE 的 QTLs 进一步聚合;通过育种对稻米 CRE 进行遗传改良,需要选择适当的亲本,用轮回亲本与之连续回交,并结合自交使该性状的 QTLs 进一步纯合。讨论了通过回交方法聚合 CRE 有关 QTLs 和改良稻米 CRE 等蒸煮品质的育种策略。更多还原

【Abstract】 The cooked rice elongation（CRE）of 38 core rice germpalsm listed in the Global Molecular Breeding Program and the progenies backcrossed with Chenghui 448（CH448,the recurrent parent）were tested and analyzed.The results of factor analysis showed that in the BC₃F₂ populations of 38 donors hackcrossed with CH448,the variations of CRE were different within different backcrossed populations and also among different populations.It was decided by the donors and showed in factor 2 which was consisted of variation coefficient & minimum,and factor 3 which was consisted of average & maximum.Among the 38 populations,three combinations in which the donors were Shengnong 365,G46B and OM1706,were the ideal combinations for CRE improvement.It should be advantageous to select proper BC₃F₂ populations for the aggregation of CRE-QTLs and genetic improvement of CRE.In the BC₃F₂ & BC₃F₃ populations of Shengnong365,x23,Palung2 & x22 backcrossed with CH448,and the BC₂F₃,BC₂F₄ & BC₂F₅ populations of Basmati370 backcrossed with the same recurrent parent,the variation trends and extents were different along with the different donors.The numbers of CRE- QTLs polymerized into the progenies backcrossed with the recurrent parent was related to the donors.Self-croasing was benefit for the polymerization of CRE-QTLs,additionally.The suitable donors should be selected and backcrossed with the recurrent parent continuously for two to three generations,and adopted selfcrossing several times to polymerize and purify the QTLs of CRE in order to improve the CRE through rice breeding.The breeding strategy was discussed and proposed for the aggregation of CRE=QTLs and the improvement of the cooking quality including CRE through rice backcrossing breeding.更多还原