biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 42:567-573, 1999 | DOI: 10.1023/A:1002623300097

Influence of Ageing and Abscisic Acid on Potassium Uptake by Potato Tuber Tissues

A. Reddahi1, A. Es-Sgaouri2, C. R'Kiek3
1 Laboratoire de Biologie et Physiologie Végétales, Département de Biologie, Université Hassan II-Mohammedia, Faculté des Sciences Ben M'sik, Casablanca, Maroc
2 Laboratoire de Biologie et Physiologie Végétales, Département de Biologie, Université Hassan II Aïn Chock, Faculté des Sciences, Casablanca, Maroc E-mail
3 Institut National de la Recherche Agronomique, Centre Régional du Rif, Tanger, Maroc

The potassium uptake by potato tuber discs tissues freshly cut and after 24 h of ageing in the presence or not of abscisic acid was investigated. Uptake kinetics revealed a biphasic dependence on external K+ concentrations. At concentration less than 10 mM, uptake was mediated by a saturable component and a linear component became apparent at higher concentrations. At low K+ concentrations (lmM), the capacity of K+ uptake diminished by 2 times after ageing. Treatment of tissues with ABA increased the rate of K+ uptake. In both fresh and aged tissues the uptake was strongly enhanced by fusicoccin and decreased by several metabolic inhibitors and ATPase inhibitors, underlying the active nature of uptake and suggesting the involvement of a plasmalemma H+-ATPase in K+ transport system.

Keywords: H+-ATPase; phytohormones; Solanum tuberosum L.
Subjects: abscisic acid, K uptake, tuber; ageing, K uptake, potato tuber; ATPase, K uptake, tuber; cyanate (KCN), K uptake; 2,4-dinitrophenol, K uptake; erythrosine B, K uptake; furfurylaminopurine, K uptake; fusicoccin, K uptake, tuber; N,N'-dicyclohexyl-carbodiimide, K uptake; N-ethylmaleimide, K uptake; orthovanadate, K uptake; potassium uptake, ageing, potato tuber; potato, ageing, K uptake; rubidium (86Rb) uptake, inhibitors, potato tuber; salicyl hydroxamic acid, K uptake; Solanum tuberosum; tuber, potato, K uptake, ageing

Published: December 1, 1999  Show citation

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Reddahi, A., Es-Sgaouri, A., & R'Kiek, C. (1999). Influence of Ageing and Abscisic Acid on Potassium Uptake by Potato Tuber Tissues. Biologia plantarum, 42(4), 567-573. doi: 10.1023/A:1002623300097
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