不同籼稻品种整株幼苗根系K^+吸收和H^+释放的关系——一种筛选高效K^+吸收水稻品种的方法

Correlation between K^+ Influx and H^+ Efflux by Roots of Intact Seedlings of indica Rice Varieties——A Method for Screening Efficient K^+-uptaking Lines

在0.2mmol/1 CaSO_4溶液中培养的不同籼稻品种低盐幼苗根系在1.0mmol/1KCl和0.5mmol/1 K_2SO_4介质中的K^+吸收和H^+释放之间均呈非常显著的直线相关性。线性相关的斜率因测定方法而有所变化,但相关性意义不变。水稻在KCl介质的K^+吸收速率比在K_2SO_4介质中的大,但前者对应的H^+释放速率却比后者的小,且K^+吸收速率间没有对应的显著性相关意义。实验结果表明,虽然可以用直接测定吸收介质的酸化程度作为一种简捷的筛选高效K^+吸收水稻品种的方法,但必须根据实际情况选用吸收介质。

The relation between K^+ influx and H^+ efflux by roots of low-salt indica rice varieties cultured in 0.2 mmol/1 CaSO_4 solution was studied. The linear correlations between K^+ influx and H^+ efflux in both 1.0mol/1 KCl and 0.5mol/K_2SO_4 media were highly significant The rates of K^+ influxes by indica rice varieties were greater in KCl medium than those in K_2SO_4 medium, but rates of H^+ effluxes were reverse. There was no corresponding relation between the rates of K^+ influx or H^+ efflux in both media. The above results indicated that the measurement of actdication of uptake medium (i. e.pH values decrease) could be used as a simple method for screening efficient K^+ uptaking indica rice cultivars. but the uptake medium should be selectively used according to the field comditions.