玉米萌芽期水分胁迫的抗旱性分析

Drought Resistance in Corn at Germination Stage

通过PEG渗透胁迫人工模拟干旱条件,对山西省新近育成和当前常见的18个玉米杂交种进行了萌芽期抗旱性研究。结果表明:萌发期水分胁迫降低了各玉米品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运转率。但不同的玉米品种在抗旱性上存在极显著差异,抗旱性强的品种在水分胁迫下仍然保持较高的发芽势和发芽率。活力抗旱指数和萌发抗旱指数可以良好地反映品种间抗旱性的差别。通过对上述指标的测定,可以较好地反映出玉米品种萌芽期的抗旱性。

The study on drought resistance of eighteen maize varieties generalized now in Shanxi province in germination stage was conducted through adopting PEG solution simulated soil drought treatment. The results showed that the germinating vigor and germinating rate, the growth rate of embryo bud and root and the transformation percentage of stored substance were all decreased under water stress condition. There were significant differences on drought resistance among the varieties. The varieties with higher drought resistance kept higher vigor of germination and germination capacity. The vigor index of drought resisting and sprout index of drought resisting could well reflect the differences of drought resistance in all varieties. The drought resistance traits of maize in seedling germination stage could be reflected better by evaluating these indexes.