不同杂交水稻品种根系生理特性差异

Differences of root physiological characteristics within hybrid rice varieties

在田间条件下,对不同杂交水稻品种生育期根系生理特性进行研究。结果表明,各水稻品种生育期内根系生理指标的变化趋势基本一致,但其含量具有明显差异,除根系活力外,其他生理指标的差异在抽穗期达到显著或极显著水平。各品种间,冈优725的根系活力、伤流强度、氨基酸含量及可溶性糖含量在生育期的大部分时间内高于其他水稻品种;Ⅱ优725根系中蛋白质含量和可溶性糖含量在抽穗期较高,而对照品种的各生理指标最低。相关分析表明,所有根系生理指标在大部分生育时期与产量呈正相关,表明通过改良根系生理特性来提高水稻产量是可行的。

The differences of root physiological characteristics within hybrid rice varieties were studied in the field experiment. It was shown that the change trend of root physiological indexes within rice variety was consistent,but the contents of most root physiological indexes varied significantly except the root activity during heading stage. Root activity,bleeding intensity,contents of amino acid and soluble sugar in rice cv. Gangyou725 were higher than those in other rice varieties in most of the growth period. The contents of protein and soluble sugar were higher in rice cv. Ⅱyou725 at the heading stage. All physiological indexes were the lowest in the control variety. Correlation analysis indicated that there was a positive correlation among all root physiological indexes and yield for most of the growth period,which indicated the feasibility of increasing rice yield by improving root physiological properties.