5个玉米人工合成群体选系的杂优类群分析  

Analysis on Heterotic Groups of Inbreds from 5 Synthetic Maize Populations

作　　者：苟才明[1] 杨克诚[1] 

机构地区：[1]四川农业大学玉米研究所/教育部作物基因资源与遗传改良重点实验室,雅安625014

出　　处：《华中农业大学学报》2008年第1期22-27,共6页Journal of Huazhong Agricultural University

基　　金：国家科技攻关计划(2004BA525B04);教育部长江学者和创新团队发展计划(IRT0453);四川省玉米育种攻关项目资助

摘　　要：以5个玉米人工合成群体的15个新选自交系和西南地区常用的8个骨干玉米自交系以及代表我国玉米核心种质的Mo17、黄早四、丹340、478等4个标准测验种为材料,利用SSR标记,进行了杂优类群划分,以15个新选系和8个常用骨干系按不完全双列杂交组配的120个杂交组合为材料,通过单株产量测定、杂种优势估算,分析了杂优模式。结果表明:27个自交系间遗传差异较大,可分为5个杂种优势群,其中第Ⅱ类又可分为4个亚类;5个玉米人工合成群体的15个新选系有12个划入旅大红骨群,1个划入瑞德群,2个划入其它类群;在各类群组配中,Lancaster群与旅大红骨群组配可产生较强的杂种优势,特别是Lancaster群与旅大红骨Ⅰ亚群和旅大红骨Ⅳ亚群组配获得强优势组合可能性更高。The preliminary objective of this study was to evaluated heterotic groups and heterotic patterns of a set of 15 newly developed inbred lines.The materials which were classified by using SSR markers were 4 normal corn inbred lines（Mo17,Huangzaosi,Dan340 and 478）,which represented four main heterotic groups,namely,Lancaster,Sipingtou,Luda Red Cob and Reid in China,and 8 testers which were commonly used in southwest regions,and 5 newly inbreds abtained from 5 synthetic corn populations named GP1,GP2,GP3,GP4 and GP5.The materials of estimating heterotic patterns were 120（15×8） combinations by crossing 15 new maize inbred lines with the 8 testers by NCⅡ mating design.Clustering analysis was done on the basis of the genetic distance coefficient.Heterotic patterns was analyzed based on the data from the experiment and clustering analysis.The results showed that the 27 inbred lines could be classified into 5 heterotic groups,which populationⅡ could be divided into 4 subgroups.Among the various populations,Lancaster and Luda Red Cob could becomesuperior combinations,especially Lancaster×Luda Red Cob I and Lancaster×Luda Red Cob Ⅳ.So,Lancaster×Luda Red Cob I and Lancaster×Luda Red Cob Ⅳ become heterotic patterns.

关 键 词：玉米 群体 自交系 杂优类群 杂优模式 

分 类 号：S513.035.1[农业科学—作物学]