Auxin induced H+ secretion in Helianthus and its implications

We have examined the ability of Helianthus hypocotyl segments as well as segments from a variety of other species to elongate in response to H+ and to secrete H+ in response to auxin and fusicoccin. In all cases a positive response was obtained when the cuticular barrier was abraded with carborundum...

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Bibliographic Details
Published inPlant physiology (Bethesda) Vol. 60; no. 4; pp. 509 - 512
Main Authors Mentze, J, Raymond, B, Cohen, J.D, Rayle, D.L
Format Journal Article
LanguageEnglish
Published United States American Society of Plant Physiologists 01.10.1977
Subjects
Animal cuticle
Auxins
Coleoptiles
Electrodes
Epidermis
Helianthus annuus
Hydrogen
hydrogen ions
Hypocotyls
Plants
Secretion
Sunflowers
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Summary:We have examined the ability of Helianthus hypocotyl segments as well as segments from a variety of other species to elongate in response to H+ and to secrete H+ in response to auxin and fusicoccin. In all cases a positive response was obtained when the cuticular barrier was abraded with carborundum. Removal of the cuticular barrier by "peeling" prevented detection of both auxin-induced elongation and H+ secretion. Fusicoccin-induced growth and acid secretion are not prevented by peeling. These results suggest considerable tissue selectivity with respect to auxin action but considerably less specificity with respect to fusicoccin. It seems likely that in many dicots auxin-enhanced proton secretion and elongation are controlled by the epidermis and/or closely associated cell layers. The data presented in this paper provide further support for the acid growth theory of auxin action.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0032-0889
1532-2548
DOI:10.1104/pp.60.4.509