抗黄曲霉玉米群体GT-MAS：gk的配合力效应与杂种优势群划分

Combining Ability and Heterotic Group of Maize Population GT-MAS:gk Resistant to Aflatoxin

【目的】GT-MAS:gk为抗黄曲霉菌的玉米群体,在美国作为抗源种质被释放利用,对该群体进行配合力测定与杂种优势群划分的研究,有利于外引群体在国内的有效利用和推动抗黄曲霉玉米育种工作在国内的开展。【方法】试验于2003～2005年在山西农科院谷子研究所(长治)进行;试验采用6×6不完全双列杂交的遗传设计,以6个骨干自交系为测验种对抗黄曲霉玉米群体GT-MAS:gk等6个外引群体进行配合力测定。【结果】GT-MAS:gk群体产量的一般配合力效应值GCA为-9.9,在被测的6个群体中居中等水平,与掖478、齐319和Mo17有相对较高的特殊配合力效应,与黄早四、丹340和B73的特殊配合力效应为负向值。【结论】GT-MAS:gk群体应归为瑞德类群,对应的杂种优势群为PA类群、兰卡斯特类群和78599选系。

[Objective] Maize population GT-MAS：gk identified and released in U,S.A. is a germplasm resistant to aflatoxin contamination. The study on combining ability and heterotic pattern of the population will be valuable to resistance breeding of maize using GT-MAS： gk in China, [Method] This study was conducted in years 2003, 2004 and 2005. A 6×6 incomplete diallel crossing genetic design was adopted and 6 inbred lines were selected as testers to test the yield combining ability of 6 populations including GT-MAS：gk. [Result] The results showed that the GCA of the population GT-MAS：gk possessed a medium level among the 6 tested populations, but the SCA possessed a higher level when crossed with Ye478, Qi319 and MolT, and possessed a lower level when crossed with Huangzao 4, Dan 340 and B73; [ Conclusion] GT-MAS：gk can be classified into Reid heterotic group, whose prevailing heterosis patterns may include GT-MAS：gkxPA, GT-MAS：gkxLancaster, GT-MAS：gkxthe lines derived from P78599.