Effects of Ca2+, K+ and cGMP on Na+ uptake in pepper plants

被引：62
|
作者：
Rubio, F [1 ]
Flores, P [1 ]
Navarro, JM [1 ]
Martinez, V [1 ]
机构：
[1] CSIC, Ctr Edafol & Biol Aplicada Segura, Dept Fisiol & Nutr Vegetal, Murcia 30080, Spain
来源：
PLANT SCIENCE | 2003年 / 165卷 / 05期
关键词：
calcium; cation channel; cGMP; pepper; potassium; sodium influx;
D O I：
10.1016/S0168-9452(03)00297-8
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The effects of Ca-,(2+) K+ and cGNIP on Na+ influx in pepper plants (Capsicum annum L.) were studied. Calcium and K+ inhibited Na+ net uptake and had no effect on Na+ efflux. The inhibition of Na+ uptake by Ca2+ showed a K-i of 0.46 mM and micromolar concentrations of the membrane permeable cyclic nucleotide 8-bromo-cGMP inhibited Na+ uptake. These results suggest that transporters with low discrimination between K+ and Na+, sensitive to Ca2+ and to cyclic nucleotides, may constitute important pathways for Na+ influx. As suggested for other plant species, non-selective voltage-independent cation channels may mediate a large amount of Na+ influx into pepper plants. (C) 2003 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码：1043 / 1049
页数：7
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