盐胁迫下植物细胞吸收Na^＋的可能途径

对植物细胞Na+吸收的主要研究手段和近年来的研究成果进行了综述.膜片钳技术、放射性同位素测定技术以及基因剔除和转基因技术常用于植物细胞Na+吸收的研究.具有吸收Na+活性的载体或通道有4类即高亲和K+载体、低亲和阳离子载体、K+通道和非选择性阳离子通道,其中非选择性阳离子通道被认为是盐胁迫条件下植物大量吸收Na+的主要途径.

Possible Pathways for Sodium Uptake by Plant Cells under Salt Stress

The major techniques applied in researches of Na~+ uptake by plant cells under salt stress and the new results gained in recent years are reviewed in this paper.Patch clamp recording,radio tracer experiment,kick-out mutants and heterologous expression system are often adopted by researchers.There are 4 kinds of carriers or channels for Na~+ influx into plant cells,that is,high affinity K~+ carriers,low-affinity cation carriers,K~+ channels,and nonselective cation channels.Na~+ uptake through nonselective cation channels is thought to be a main pathway.