摘要
K+在植物的生命活动中发挥着十分重要的作用。植物对K+的吸收,可分为高亲和吸收与低亲和吸收。在分子水平上,高亲和吸收主要由KUP/HAK/KT及HKT家族的K+转运蛋白来承担;而Shaker、KCO等家族的K+通道蛋白,则主要在植物的低亲和吸收中发挥重要作用。AKT1、HAK5及其在植物中的同源基因在高等植物K+吸收转运中占有举足轻重的地位。KUP/HAK/KT家族基因的调节,主要是转录水平的调节,而K+通道蛋白的调节则可能主要是一种翻译后调节。植物的蛋白激酶通过磷酸化K+通道蛋白来调节通道的活性,从而改变K+的吸收特性。本文综述了高等植物K+吸收运转及调节的分子机制研究方面的最新进展,并对研究的前景进行了展望。
K^＋ plays an important role in life of plants. K^＋ transporters are generally composed of high-affinity and low-affinity two part. On molecular level,high-affinity uptake are mainly carried out by K^＋ transporters belonging to KUP/HAK/KT and HKT families. K^＋ channel proteins belonging to Shaker and KCO families mainly function in low-affinity uptake. AKT1 and HAK5 along with their homologous genes play a balance-holding role in K^＋ uptake and transport of higher plants. The regulation of KUP/HAK/KT families mainly occurs on transcription level and the regulation of K^＋ channel proteins is mainly a posttranslation regulation. Protein kinases regulate potassium channel activity through phosphorylated K^＋ channel proteins to change K^＋ uptake in plants. The paper summarizes the latest research advances about K^＋ uptake and transport as well as their regulation and envisages the research prospect.
出处
《西北植物学报》
CAS
CSCD
北大核心
2006年第11期2402-2410,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家烟草专卖局科教司资助项目
关键词
植物
K^+转运蛋白
分子机制
调节
plant
K^＋ transporter
molecular mechanism
regulation
