对4个自交系丹340、丹9046、丹598和Mo17组成的6个杂交组合进行了萌芽期抗旱性研究.结果表明水分胁迫降低了杂交种的发芽势和发芽率,阻碍了胚芽和胚根的生长,降低了种子中贮藏物质的利用效率,也降低了胚乳中的淀粉酶活性.试验表明,不同杂交种在抗旱性上存在明显差异,抗旱性强的杂交种在水分胁迫下仍然保持较高的发芽势和发芽率,贮藏物质的利用效率和淀粉酶活性下降的幅度较小.因此认为通过对上述这些指标的测定可以较好地反映出玉米杂交种萌芽期的抗旱性。

The study on drought resistance of six hybrids in seedling emergence stage showed that the viability and percentage of germination,growth rate of seedling and root,transformation percentage of stored substance and amylase activity were decreased by water stress.There were obvious drought resistance difference among the hybrids.The higher drought resistance hybrids kept high viability and percentage of germination,amylase activity and transformation percentage of stored substance under water stress while the lower drought resistance hybrids were decreased seriously.The results showed that evaluations based on these indexes could reflect the drought resistance traits of maize in seedling emergence stage.