Stimulation of Potassium Uptake by Abscisic Acid in Potato Tuber Tissues. Relation with H+ and Ca2+ Fluxes |
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Authors: | A Reddahi A Es-Sgaouri N El Mourabit M Benicha |
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Institution: | (1) Laboratoire de Biologie et Physiologie Végétales, Département de Biologie, Université Hassan II-Mohammedia, Faculté des Sciences Ben M'sik, Casablanca, Maroc;(2) Institut National de la Recherche Agronomique, Centre Régional du Rif, 78, Bd Sidi Mohammed ben Abdellah, Tanger, Maroc |
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Abstract: | Previous results with potato tuber discs showed that a treatment with abscisic acid stimulated K+ uptake. In this investigation, we determine the relationship between increased K' uptake and H+extrusion, and Ca2+ fluxes by treating tissues with specific Ca2+ channel blocker (La3+), calmodulin (CaM) inhibitors (chlorpromazine and W7), and with Ca2+ ionophore (A23187). K+ uptake increased with increasing external pH whether tissues were treated with ABA or not. Treatment of tissues with La3+ inhibited K+ uptake, whereas CaM inhibitors have no effect. By contrast ABA and A23187 produced a synergistic effect, suggesting that
ABA may act in part, on K+ uptake, like a Ca2+ agonist, in accord with Huddart's hypothesis.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | calmodulin H+-ATPase lanthanum Solanum tuberosum L |
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