中文摘要：

为探讨钾的高亲和转运系统是否受到铵离子的影响，采用溶液培养方法研究了水稻、大豆两种作物苗期（16d）的K^＋高亲和转运系统吸收动力学特征及其受吸收液中NW的影响。结果表明，NW对K^＋吸收的Vmax的影响在作物种类间有较大的差异，水稻受影响显著小于大豆。NW对供试作物K^＋吸收的Km值影响均很小，说明NW对K^＋吸收速率的影响主要在于影响了细胞膜上K^＋载体的数量而非影响了载体吸收位点与K^＋之间的亲和性。

英文摘要：

The present work focused on the influence of NH4^＋ on the high affinity transport system （HATS） for K^＋ . Hydroponic experiments were carried out to study the uptake kinetics of high affinity transport system for K^＋ by rice and soybean seedlings, and of their response to NH4^＋ . The results indicated that the effect of NH4^＋ on Vmax of K ^＋ uptake in rice was significantly lower than that in soybean. The influence of NH4^＋ on the values of Km of both two tested crops was neglected ; indicating effects of NH4^＋ on K ^＋ uptake are mainly attributed to its influence on the quantity of potassium carriers located at the cell membrane instead of on the affinity of the uptake sites for K ^＋ .