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利用SSR标记从分子水平上对京科968、京科665、NK718和京农科728系列玉米品种的杂种优势模式进行分析。40对SSR引物在37份供试自交系中共检测出270个等位基因变异,平均每对引物检测出6.75个等位基因,平均多态性信息含量为0.66。UPGMA聚类分析和群体结构分析结果一致,所测自交系被划分成8个杂种优势群,京科968母本京724等5个自交系单独成群,命名为X群;两个骨干父本自交系京92、京2416与自交系黄早四、昌7-2划为一群,同属黄改群(塘四平头群);其他6个群分别为旅大红骨群、瑞德群、P群、兰卡斯特群、改良瑞德群和Iodent群。京科968等系列品种的杂优模式为“X群×黄改群”。通过近年来育种实践和大面积生产证明,“X群×黄改群”已成为我国玉米生产上一种快速上升的主要杂优模式。
The SSR markers were used to analyze the heterosis patterns of the maize varieties Jingke 968, Jingke 665, NK718 and Jingnong 728 from the molecular level. Forty-seven pairs of SSR primers detected 270 alleles in 37 inbred lines, with an average of 6.75 alleles per primer pair. The average polymorphism information content was 0.66. UPGMA clustering analysis was consistent with the results of population structure analysis. The inbred lines tested were divided into 8 heterosis groups, and 5 inbred lines of Jingke 968 Maobing Jing 724 were clustered separately and named as X group. The two backbone The male parent inbred lines Jing 92, Jing 2416 and inbred lines Huang Zaosi and Chang 7-2 were zoned as a group, belonging to the Huang Siqun group (Tongsipingtou group); the other six were the Ludao group, the Reid group, P, Lancaster, Improved Reid and Iodent. Jingke 968 and other varieties of hybrid model for the “X X Huang yellow group”. In recent years, breeding practice and large-scale production proved that “X group × Huang group” has become a rapid increase in China’s maize production is a major heterotrophic mode.