Combining abilities for yield and yield components in maize

文献类型： 外文期刊

第一作者： Fan, X. M.

作者： Fan, X. M.;Chen, H. M.;Tan, J.;Xu, C. X.;Luo, L. M.;Huang, Y. X.;Zhang, Y. D.;Kang, M. S.

作者机构：

关键词： maize germplasm introduction;yield component trait (YCT);international maize and wheat improvement center, Mexico (CIMMYT);general combining ability (GCA);specific combining ability (SCA) analysis

期刊名称：MAYDICA （ 影响因子：0.542； 五年影响因子：0.605 ）

ISSN： 0025-6153

年卷期： 2008 年 53 卷 1 期

页码：

收录情况： SCI

摘要： Ear length (EL), car diameter (ED), number of kernel rows per ear (RE), kernel number per row (KR), and thousand-kernel weight (TKW) are the most important yield components (YCTs) of grain yield in maize (Zea mays L.). Many investigations have been conducted on grain yield combining ability and the results have been widely used in maize breeding programs. Limited research has been done on combining ability of maize YCTs, however, and no reports on the relationship between grain yield combining ability and YCTs combining abilities exist. The objectives of this study were to 1) estimate combining abilities of grain yield and of EL, ED, RE, KR, and TKW; and 2) examine the relationship between grain yield combining abilities and the combining abilities of the YCTs. The results showed the GCA effects of ED and RE were generally better for the CIMMYT lines than for local lines. The 2GCA MS/(2(GCA MS + SCA MS) ratios for grain yield and for the YCTs were between 0.81 and 0.95, indicating additive genetic effects were more important for these traits. This study also showed that the GCA effects of grain yield were related to YCTs' GCA effects in an inbred line and the SCA effects of grain yield were also related to the YCTs' SCA effects in the same crosses. Significantly positive grain yield GCA effects usually were highly correlated with the number of the YCTs that had significantly positive GCA effect; i.e., a line with higher grain yield GCA effect generally had more YCTs having significantly positive GCA effects. Thus, selecting inbred lines with positive GCA effects in either all or most of YCTs will have greater chance to obtain crosses with higher grain yield. The information of GCA and SCA effects for YCTs is very useful for maize breeders to determine which maize line should be selected to improve local lines and which parent lines should be used for making hybrids with greater grain yields.

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