By the test cross for the dominant gentic male sterility(DGMS) heterozygous type 6CA and homozygous type 6AB, some of the tempo rary maintainer line and restore line of DGMS were selected.

• 利用显性核不育材料(杂合型6CA、纯合型6AB)进行广泛的测交试验，从中筛选出了临保系和恢复系。