在干旱条件下,玉米苗期根冠比越大,耐旱性越强,叶片卷曲程度就轻.结果表明:515、226和524等自交系的耐旱能力最好,所配杂交组合的耐旱能力也较强,一般配合力相对效应较低;而260、540和438等自交系的平均耐旱能力最差,一般配合力相对效应较高.自交系苗期叶片卷曲度的遗传力达到66.3%.具有较高的遗传特性。

Under arid stress．the ratio nf root-crown in seedling period of maize was bigger．the drought toler-anee was better，the degree of leaf-roll was lighter The result showed the drought tolerance of 515，226，524 inbredlines was the best．the drought tolerance of their hybrid combines was the better．the effective value of the GCA fnrinbred lines was the lower. But the drought tolerance of 260．540．438 inbred-lines was the worst the effective valueof the GCA fnr inbred-lines was the higher The hereditary of the inbred—lines was 66.3％．they had the traits of the higher hereditary.