K+ nutrition and Na+ toxicity:: The basis of cellular K+/Na+ ratios
K+ nutrition and Na+ toxicity:: The basis of cellular K+/Na+ ratios
复制标题
DOI：
10.1006/anbo.1999.0912
复制
发表时间：
1999-08-01
期刊：
影响因子：
4.2
通讯作者：
Amtmann, A
中科院分区：
文献类型：
--
作者：
Maathuis, FJM;Amtmann, A
植物维持高胞质 K+/Na+ 比率的能力可能是植物耐盐性的关键决定因素之一。近年来，在影响细胞质 K+/Na+ 比率的基因和转运蛋白的鉴定和表征方面取得了重要进展。对于 K+ 吸收、K+ 流出和 K+ 易位至芽，已分离出编码 K+ 吸收和 KC 释放离子通道以及与 H+ 或 Na+ 梯度耦合的 K+ 载体的基因。尽管 Na+ 移动的情况不太清楚，但一种非选择性离子通道形式的途径可能在 Na+ 吸收中发挥作用，而 Na+ 流出和区室化可能是由 H+ 偶联的反向转运介导的。此外，一些蛋白质已被鉴定在 K+ 和/或 Na+ 通量的调节中发挥着重要作用。在本植物学简报中，我们将在 K+ 营养和 Na+ 毒性的更广泛背景下讨论这些基因和转运蛋白的功能和相互作用。 (C) 1999 年植物学公司年鉴。
The capacity of plants to maintain a high cytosolic K+/Na+ ratio is likely to be one of the key determinants of plant salt tolerance. Important progress has been made in recent years regarding the identification and characterization of genes and transporters that contribute to the cytosolic K+/Na+ ratio. For K+ uptake, K+ efflux and K+ translocation to the shoot, genes have been isolated that encode K+ uptake and KC release ion channels and K+ carriers that are coupled to either a H+ or Na+ gradient. Although the picture is less clear for the movement of Na+, one pathway, in the form of non-selective ion channels, is likely to play a role in Na+ uptake, whereas Na+ efflux and compartmentation are likely to be mediated by H+-coupled antiport. In addition, several proteins have been characterized that play prominent roles in the regulation of K+ and/or Na+ fluxes. In this Botanical Briefing we will discuss the functions and interactions of these genes and transporters in the broader context of K+ nutrition and Na+ toxicity. (C) 1999 Annals of Botany Company.