用玉米综合种“G—1”与一墨西哥一年生大刍草进行种间杂交,后代采用连续自交、1—3代回交结合自交的选育方法,进行选系。对不同选育方法的育种效果作了分析。结果表明,无论采用连续自交或不同次数回交后自交选系,都能获得较好的选系。但回交比自交具有较快的稳定速度。在回交选育方法中,不同回交次数从总体而言无明显差异,但不同回交亲本对后代选系的影响是显著的;而且,不同回交亲本显示具有不尽相同的适宜回交次数。 Interspecific hybridization was carried out with the corn variety “G-1” and a Mexican annual herbaceous grass, and the progenies were selected by continuous selfing, 1-3 generations backcrossing and selfing. The breeding effects of different breeding methods were analyzed. The results showed that no matter whether self-selection lines were used after continuous backcrosses or different times of backcrossing, better selection lines could be obtained. However, backcrossing has a faster and stable rate than selfing. In the backcross breeding method, the number of different backcrosses was not significantly different from the overall, but the effect of different backcross parents on the progeny lines was significant. Moreover, the different backcross parents showed different suitable backcross frequency.