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Voltage transients elicited by sudden step-up of auxinIt is hypothesized (i) that the molecular mechanism for the reception of friction and flexure and the mechanism by which auxin enhances ethylene production have in common a release of free calcium into the cytosol, (ii) that elevated cytosolic calcium initiates vesicle exocytosis, and (iii) that the vesicles release a factor or set of factors which depolarizes the plasmalemma and promotes ethylene synthesis. One consequence of such exocytosis should be small, extracellularly observable voltage transients. Transients, ranging in size up to 600 microvolts and possessing risetimes (10-90%) of approximately 200 ms, are known to be elicited in etiolated stems of Pisum sativum L. by friction and are here shown to be elicited by sudden increase of auxin concentration and also by a Ca2+ ionophore.
Document ID
20040120821
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Pickard, B. G.
(Washington University St. Louis, Missouri 63130, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Plant, cell & environment
Volume: 7
ISSN: 0140-7791
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-420
CONTRACT_GRANT: 507RR07054
Distribution Limits
Public
Copyright
Other

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