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Compound 48/80, a calmodulin antagonist, inhibits ion‐porter function in plant roots
Author(s) -
Jacoby Benjamin,
Rudich Braha
Publication year - 1987
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1987.tb04314.x
Subject(s) - calmodulin , hordeum vulgare , symporter , depolarization , phaseolus , atpase , biochemistry , chemistry , antagonist , ion transporter , biophysics , membrane potential , biology , membrane , botany , receptor , poaceae , enzyme , transporter , gene
A rather specific inhibitor of calmodulin‐regulated functions, compound 48/80. inhibited 36 Cl − , 86 Rb + and 22 Na + absorption by Hordeum vulgare, Phaseolus mungo and Zea mays roots. The compound did not inhibit plasmalemma or tonoplast Mg: 2 ‐ATPase activity; neither did it inhibit or uncouple respiration, or affect ATP content and seemed also not to cause depolarization of the membrane potential of roots cells. Compound 48/80 inhibited the ΔpH‐mediated Cl − ‐H + symport in ATP‐depleted roots.