Stimulation of Potassium Uptake by Abscisic Acid in Potato Tuber Tissues. Relation with H+ and Ca2+ Fluxes

Autor:	A. Reddahi, N. El Mourabit, A. Es-Sgaouri, M. Benicha
Rok vydání:	1999
Předmět:	Agonist Calmodulin biology Chemistry medicine.drug_class Potassium fungi Ionophore food and beverages chemistry.chemical_element Stimulation Plant Science Horticulture chemistry.chemical_compound Biochemistry medicine biology.protein Channel blocker Chlorpromazine Abscisic acid medicine.drug
Zdroj:	Biologia plantarum. 42:575-581
ISSN:	1573-8264 0006-3134
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::74a5ac1103c51555dded6ee4cf297b80 https://doi.org/10.1023/a:1002675317844 Zobrazit plný text záznamu Full text from SpringerLink