玉米和类玉米及其杂交后代染色体异染色质纽重复序列的-玉米科学.docVIP

16份美国玉米种质扩增计划材料的利用潜力分析 曾艳华1，程伟东1，谢小东1，周海宇2，覃兰秋1，周锦国1，谭贤杰1，江禹奉1，谢和霞1 （ 1广西农业科学院玉米研究所，南宁 530007；2广西玉林农业科学院，玉林，537000） 摘要：对引进的16份美国玉米种质扩增计划（GEM）玉米材料和5份自育自交系进行配合力分析,划分杂种优势群，评价其利用潜力。采用NC-II设计配制80个组合，田间鉴定随机区组设计,三次重复。结果表明，两组亲本８个性状的一般配合力方差，大多数达到显著或极显著水平；两组亲本组配的杂交组合的特殊配合力方差，除突尖的不显著外，其余均达到极显著水平；其中GH358各性状综合GCA效应值最高，GR9、GR15和GH291、GH302综合GCA效应值较高；组合GH281×GR15的产量SCA效应值和总配合力TCA均最高。聚类分析结果，16份供试美国GEM玉米材料被划分为两大杂种优势群，进而划分为五个亚群。GH358是最为理想的亲本材料，GR9、GR15和GH291、GH302是具有利用价值的玉米材料，用它们作亲本组配出高产组合的机率较大。GH281×GR15是本研究筛选出的强优势组合；GH230×GR2、GH358×GR22和GH266×GR9可以作为优势组合进一步筛选鉴定；GH219×GR10、GH266×GR2、GH283×GR10 产量配合力表现较好，应着重进行改良和利用。 关键词：玉米；GEM种质；杂交组合；配合力；杂种优势群 Analysis on the Utilization Potentiality of 16 American Materials from Germplasm Enhancement of Maize ZENG Yan-hua,CHENG Wei-dong,XIE Xiao-dong,ZHOU Hai-yu,QIN Lan-qiu,ZHOU Jin-guo, TAN Xian-jie,JIANG Yu-feng,XIE He-xia (1 Maize Research Institute,Guangxi Academy of Agricultural sciences,Nanning 530007; Yulin Academy of Agricultural sciences,Yulin,537000) Abstract: The combining ability of 16 GEM maize materials from CIMMYT and 5 self-bred inbred lines was analysed .Their heterotic groups were clarified and their utilization potentiality was analysised in this article.80 hybrids in an NC-Ⅱmating design were evaluated in field using randomized block design in triplicate . Results indicates that significant or highly significant differences were observed in GCA for most 8 parental characters studied .Highly significant differences were observed in SCA except bald top length. Among them,the integrated GCA in each trait of GH358 is the highest and higher in GR9、GR15 and GH291、GH302,both the yield SCA and TCA are the highest in cross GH281×GR15. Clustering diagram indicates that 16 American GEM maize Materials were divided into II heterotic groups and 5 sub groups.GH358 is the most ideal parent material.GR9, GR15 and GH291, GH302 proved to be valuable maize materials,the probability of high yield combination is greater using them as parents. GH281×