三个用CIMMYT种质构建的玉米半外来群体的改良和利用

用来自CIMMYT的热带、亚热带早熟群体和与之杂种优势关系最近的我国温带核心种质代表系杂交构建的半外来群体中的部分选系与测验种测交,通过杂种优势和配合力来分析改良效果。结果表明,半外来群体丹340×Pob70选系的一般配合力较高,与Lancaster群和改良Reid群测验种都有较大的杂种优势;Pob101×掖478选系的一般配合力中等,主要与旅大红骨群和Lancaster群测验种有较大的杂种优势,掖107×Pob69选系的一般配合力较低,但与旅大红骨群测验种有一定的杂种优势。该改良方法为这些半外来群体及其选系的继续改良和利用提供了依据。

Improvement and usage of three semi-exotic maize populations constructed with CIMMYT germ plasm

The heterosis and combining ability of some maize lines selected from three semi-exotic populations constructed with CIMMYT tropical or sub-tropical germ plasm and temperate lines were tested to study their improvement effects and cross direction in China. The results showed that lines selected from semi-exotic population Dan340 ×Pob70 had higher general combining ability and the heterosis when crossed with lines in the Lancaster group and the improved Reid group. The lines selected from semi-exotic population Pob101 ×Ye478 had medium general combining ability and higher heterosis when crossed with lines in the Ludahonggu group. The lines selected from the semi-exotic population Ye107×Pob69 had lower general combining ability and medium heterosis when crossed with lines in the Ludahonggu group.