玉米昌7-2近缘系遗传多样性及其配合力分析  

Genetic Diversity of Chang 7-2 Related Inbred Lines of Maize and Analysis of Their Combining Ability

作　　者：李潮海[1] 赵亚丽[1] 王小星[1] 王群[1] 杨青华[1] 汤继华[1] 

机构地区：[1]河南农业大学农学院,河南郑州450002

出　　处：《河南农业大学学报》2008年第2期150-154,共5页Journal of Henan Agricultural University

基　　金：河南省科技攻关项目(0424090006)

摘　　要：采用SSR分子标记和NCⅡ交配设计相结合的方法,研究了4个昌7-2近缘系的遗传多样性及其与Reid群的配合力和杂交组合的产量。并分析了它们之间的相关性.结果表明,4个昌7-2近缘系间存在遗传多样性,安昌7-2、甘昌7-2和新7红三者之间的遗传距离较近,而浚928与它们的遗传距离较远;4个昌7-2近缘系组配的杂交组合(F_1)的平均产量存在显著差异,浚928所配F_1的平均产量高于安昌7-2和甘昌7-2 F_1的平均产量,新7红所配F_1的平均产量低于安昌7-2和甘昌7-2 F_1的平均产量,且安昌7-2所配F_1的平均产量高于甘昌7-2 F_1的平均产量.各自交系的配合力效应与其产量结果基本一致;SSR分子标记遗传距离与杂交组合产量、特殊配合力与杂交组合产量之间均呈显著正相关,特殊配合力与遗传距离之间也呈正相关,但未达到显著水平.The genetic diversity of 4 Chang 7 -2 related inbred lines was studied using SSR markers, the combining ability with Reid group and the grain yield of their hybrid combinations were analyzed by NC Ⅱ model, and the correlation between genetic distance （GD）, special combining ability （SCA） and their correlation with F1 grain yield were also studied. The results showed that： （1） There were SSR polymorphisms among 4 Chang 7 - 2 related inbred lines. The GD between A 7 - 2, G 7 - 2 and X 7 H were small, while the GD between X 928 and other Chang 7 - 2 related inbred lines were farther than the GD between A 7 - 2, G 7 - 2 and X 7 H ; （2） There was significant difference of grain yield among different varieties. The average yield of hybrid combinations （ F1 ） of X 928 was highest, which was higher than that of A 7 - 2 and G 7 - 2, while that of X 7 H was lowest, which was lower than that of A 7 - 2 and G 7 - 2 ; The average yield of F1 of A 7 - 2 was higher than that of G 7 - 2. In addition, the difference of combining ability was corresponded with their yield; （3） The correlation between GD and F1 grain yield,and the correlation between SCA and F1 grain yield were both significantly positive; The correlation between SCA and GD was also positive, but there was no significant difference.

关 键 词：玉米 近缘系 遗传多样性 SSR标记 配合力 

分 类 号：S513[农业科学—作物学]