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Uptake of 2,4-Dichlorophenoxyacetic Acid and Indoleacetic Acid in Tuber Slices of Jerusalem Artichoke and Potato

Abstract

Uptake of 2,4-D and IAA into tuber slices of Jerusalem artichoke (Helianthus tuberosus L.) and potato (Solanum tuberosum L.) was approximately proportional to the external auxin concentration at low (10−8M) to intermediate (10−5∓10−4M) concentrations. A disproportionately rapid increase in uptake occurred at higher concentrations, especially for 2,4-D. Uptake decreased markedly with increasing pH and there was no indication of uptake of the auxin anions. The apparently linear relationships could in some experiments be resolved into precisely multiphasic uptake patterns. It is proposed that uptake of auxins into tuber tissue is by facilitated diffusion of the undissociated acids.

Department

Biological Sciences

Publication Date

4-1-1985

Journal Title

Journal of Plant Physiology

Publisher

Elsevier BV

Digital Object Identifier (DOI)

https://dx.doi.org/10.1016/s0176-1617(85)80133-4

Document Type

Article

Rights

Copyright © 1985 Gustav Fischer Verlag, Stuttgart. Published by Elsevier GmbH All rights reserved.

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