Journal
PLANT SCIENCE
Volume 165, Issue 5, Pages 1043-1049Publisher
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S0168-9452(03)00297-8
Keywords
calcium; cation channel; cGMP; pepper; potassium; sodium influx
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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.
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