籼稻不同基因型钾素吸收利用效率的调控

REGULATION OF POTASSIUM INFLUX RATES AND UTILIZATION EFFICIENCY IN ORYZA INDICA GENOTYPES

摘要: 本试验研究了三叶期稻株不同钾素营养状态,IAA(indole-3-acetic.acid),REM(metal.mixture.including.rare.earth)和NaVO3对水稻基因型吸钾速率的调控作用。以1mol/L.K+处理15分钟后,NaVO3则极显著地抑制水稻对钾的吸收。REM和NaVO3的作用可以相互抵消。REM还可极显著地提高水稻的生物产量和钾素利用效率。说明水稻对钾的吸收可进行正向或反向调控。

Abstract: Potassium(K) influx rates of 4 O. indica genotyes were regulated by cell potassium status, IAA, REM and NaVO3 at 3-Leaf stage. The K influx rate was markedly promoted by both IAA and REM (metal mixture including rare earth). However it was significantly decreased when treated preliminarly with 1 mmol L-1 K+ for 15min. Similarly, NaVO3 inhibited the K influx rate significantly or extremely significantly as well. The effects of REM and NaVO3 were counteractive. REM also increaesd biomass and K utilization efficiency. It indicated that K influx of rice could be regulated in two directions.