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Comparison of the effects of auxin and fusicoccin on phosphate absorption by aged potato tuber discs
Authors:Danielle Poder  Annick Hounnant  Michel Penot
Institution:Laboraloire de Physiologic Végétate, Facultédes Sciences el Techniques, Univ. de Brelagne Occidental, 6 avenue Victor Le Gorgeu, 29283 Brest Cedex, France.
Abstract:Auxin (IAA, 5 × 10?5 M ) partially prevents the increase in the rate of phosphate uptake during ageing of potato tuber discs ( Solatium tuberosum L. cv. Bintje), whereas fusicoccin (FC, 10?5 M) stimulates it. After the development of enhanced phosphate transport capacity, the response to fusicoccin is greater than with fresh discs. Complementary experiments on K+ (86Rb) absorption show that FC also slightly enhances the rate of K+ uptake, while IAA has no much effect. It is suggested that IAA acts specifically on the development of a mechanism which occurs during the ageing period, while FC action may be more directly linked to the system of phosphate transport itself.
Keywords:K+ (86Rb) absorption  H+/K+– ATPase
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