谷子新不育系的配合力分析

Analysis of Parental Combining Ability of New Sterile Lines in Foxtail Millet

通过研究谷子两系杂种优势利用亲本配合力的遗传基础,为今后谷子杂交种亲本选配提供理论依据。以近年来新选育的30份谷子不育系和4份现主推杂交种恢复系为亲本材料,按照NCⅡ不完全双列杂交设计配置120(30×4)份杂交组合,对配合力及杂种优势等方面进行分析。结果显示谷子两系杂交组合主要农艺性状存在显著差异,不同材料同一性状和同一材料不同性状间的配合力差异较大。在34份材料中,S9、S12、S25、S27和R1在产量性状有着较高的一般配合力值,是较为理想的亲本。在杂交组合间存在着广泛的超亲优势和竞争优势,其中10个组合的折合产量增产显著。在组配谷子强优势组合时,不仅需选择较高GCA的双亲,较高SCA的选择也极为重要。

Understanding the genetic basis of combining ability of two lines in foxtail millet would provide theory basis for future selection of hybrid millet. According to NCⅡ incomplete double–row hybridization design, 30 new sterile lines and 4 restorers were selected as parental materials, and 120（30×4） hybrid combinations were designed in this study. The results showed that significant differences existed among the main agronomic traits of two lines hybrid combinations. The differences between the same traits of different materials and the different traits of the same material were quite significant. S9, S12, S25, S27 and R1 had higher GCA in yield traits, which were the ideal parents. Additionally, there was a wide range of super–parental and competitive advantages among those combinations, and 10 combinations were significantly increased in the converted yield. These results indicated that it was not only parents with a higher GCA, especially sterile line, but also the combination with higher SCA, which were needed for creating stronger combination of hybrid millet.