Emergent growth. An auxin-mediated response [Peas]

Restoration of oxygenated conditions following 15 minutes to 2 hours of anoxia causes light-grown pea (Pisum sativum L. var. Alaska) stem segments to elongate 100 to 200% more than continuously aerated segments. This "emergent growth" response takes place in the presence of 5 mM F-, an inh...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1977-04, Vol.59 (4), p.745-749
Main Authors: David J. Parrish, Davies, Peter J.
Format: Article
Language:English
Subjects:
Anaerobiosis
Anoxia
Auxins
Coleoptiles
Elution
Peas
Plant growth
Plants
Respiration
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Summary:Restoration of oxygenated conditions following 15 minutes to 2 hours of anoxia causes light-grown pea (Pisum sativum L. var. Alaska) stem segments to elongate 100 to 200% more than continuously aerated segments. This "emergent growth" response takes place in the presence of 5 mM F-, an inhibitor of anaerobic respiration; therefore, a build-up of glycolytic products does not appear to be the mechanism underlying emergent growth. "Acid growth" does not appear to account directly for the hyperelongation, as extracellular pH does not drop following a return to aerobic conditions. Studies with 14C-indoleacetic acid indicate that auxin is freed from some previously unavailable pool during O2-limited treatments. We suggest, therefore, that emergent growth is a response to auxin which is released during anaerobiosis: the newly mobile or diffusible auxin promoting growth when O2 is no longer limiting.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.59.4.745