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

被引：64

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

页码：1043 / 1049

页数：7

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