根据玉米棒三叶的6个农艺性状对四川省常用自交系进行了聚类分析。结果表明，四川省常用玉米自交系中有许多优异资源，但以棒三叶呈较宽叶片、较大面积、较紧凑型和较大叶面积、低叶绿素含量中间型为主，未出现较长叶片、较大叶面积、较紧凑型和较大叶面积、高叶绿素含量、较紧凑型。说明在理想株型育种中，还需进一步挖掘玉米基因资源，在考虑配合力遗传的同时加强基因重组，培育不断接近理想株型的优异玉米自交系资源。

According to six agronomic characters of three ear-leaves in inbred lines used extensively in Sichuan province were used to systemic cluster analysis. The results indicated that there are plenty of excellent inbred lines with such three ear-leaves as wider leaves, larger area, compacter type and median concentration of chlorophyll. But such types combining with longer leaves; larger area, compacter type and high concentration of chlorophyll are in badly shortage. So it suggested that we should do more works on looking for excellent gene source in maize and breeding more inbred lines with ideal three ear-leaves type while considering the heredity of combining ability and genetic recombination.

四川省农科院青年科技基金项目(2005-01)