植物高亲和性钾离子转运系统

High-affinity Potassium Transport System in Plants

钾是植物生存的必需元素,而K+必须从细胞外摄取以满足植物自身的生理需要。植物K+吸收可分为高亲和吸收与低亲和吸收,其中植物高亲和性K+转运体包括HAKs和HKTs。在普遍缺钾的陆生环境中,HAKs和HKTs在转运K+时发挥了主要作用。主要综述了这2个转运体的功能、转运机制和最新研究进展。

All plants have an absolute requirement for potassium,which must be taken up from the external medium. Potassium transportation in plants can be divided into two parts,high affinity and low affinity. Plant high-affinity transporters mainly include HAKs and HKTs. In the low K＋ land environment,these high-affinity transporters play a key role on plant potassium uptake and transportation. Therefore,HAKs and HKTs＇ functions,mechnisms of potassium transportation and the newest studies were reviewed.