高亲和钾转运体在植物抗盐中的作用

Function of High Affinity K^+ Transporter in the Tolerance of Plant to Salt

土壤盐渍化是导致作物减产的一项重要原因,Na+对大多数作物是有害的,而钾是植物不可缺少的营养成分,植物根系在外界低钾条件下主要通过高亲和性系统吸收K+。介绍了高亲和钾转运体Trk/HKT和KUP/HAK/KT 2大家族的结构和功能。主要讨论了当植物处于K+饥饿及盐胁迫下,2大家族在改善植物钾营养、提高植物耐盐性方面的作用。

Soil salinity represents an increasing threat to agricultural production. High sodium （Na^＋） concentrations in soils are toxic to most crops. On the contrary, potassium is an essential nutrients to plant. High affinity K^＋ uptake in root of higher plant can be induced when plants are deprived of potassium. The review focused on the feature and functions of two high affinity K^＋ transporter family. Trk/HKT and KUP/HAK/KT,especially in their function of the ability-improving of the tolerance of plant to salt and potassium nutrition.