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

 【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。

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

【Objective】Maize population GT-MAS:gk has been identified and released in U.S.A. as a germplasm with resistance to aflatoxin contamination, The objectives of this study were to characterize this maize germplasm in order to utilize this genetic material in maize breeding and improvement in research to resistant aflatoxin contamination;【Method】The research studies reported here have been conducted from the year of 2000 to 2005 in Shanxi Academy of Agricultural Sciences-Millet Research Institute at Changzhi of China, we chose 6 inbred lines to be testers to test the yield combining ability of 6 populations, the experimental design is by method of Incomplete Diallel Crossing; 【Result】The result showed that the GCA of the population GT-MAS:gk is just being middle level among 6 populations, but the SCA appeared higher withYe478、Qi319 and Mo17, and lower with Huangzao 4、Dan 340 and B73; 【Conclusion】We subsume GT-MAS:gk as Reid heterotic group, the heterosis paterns are GT-MAS:gk × PA, GT-MAS:gk × Lancaster, GT-MAS:gk × the lines derived from P78599.