Influence of Abscisic acid on K+ absorption by leaf discs ofSolanum tuberosum |
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Authors: | Sausan Suleiman Annick Hourmant M Penot |
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Institution: | (1) Laboratoire de Physiologie Végétale, Faculté des Sciences, Avenue Le Gorgeu, 29287 BREST Cédex, France |
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Abstract: | It is shown that, contrary to what is generally found, treatment with abscisic acid (ABA) of potato leaf tissues resulted
in an increase of K+ uptake. Comparison with other hormones was made: BAP induced an inhibition and GA3 a stimulation of K+ uptake. The uptake was sensitive to several metabolic inhibitors, external pH and ATPase inhibitors while p-chloromercuribenzenesulfonic
acid (PCMBS) had no effect. Uptake kinetics revealed the presence of both saturable and linear components which were both
stimulated by ABA treatment. Our data are consistent with an effect of ABA on the active and passive components of K+ uptake. These results are discussed in relation to the action of ABA on foliar senescence and the action on ion partitioning
in the whole plant. |
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Keywords: | |
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