Abstract
Previous results with potato leaf tissues revealed that a treatment with ABA (10-4 M) induced an increase of K+ uptake (Suleimanet al., 1990a).
In this study, we investigate the relationship between increased K+ uptake, Ca2+ fluxes and calmodulin by treating potato leaf discs with Ca2+ channel blockers (La3+, verapamil and nifedipine) and with calmodulin inhibitors (chlorpromazine, W7: N-(6-aminohexyl)-5-chloro-1-naphthalene-sulfonamide, and compound 4880).
We found : a) all these inhibitors decreased K+ uptake in the same ratio in tissues treated or not with ABA; b) a synergistic effect between ABA and the Ca2+ ionophore A 23187 on K+ uptake.
The results suggest that the hormone may act on K+ uptake like a Ca2+ agonist, in accord with HUDDART’s hypothesis.
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Penot, M., Hourmant, A., Suleiman, S. et al. Influence of Abscisic Acid on K+ absorption by leaf tissues ofSolanum tuberosum L. (cv. Bintje). Relation with calcium fluxes and with calmodulin. Biol Plant 33, 10–19 (1991). https://doi.org/10.1007/BF02873780
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DOI: https://doi.org/10.1007/BF02873780