Emergent Growth

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Abstract
Restoration of oxygenated conditions following 15 min-2 h of anoxia causes light-grown pea (Pisum sativum L. cv. Alaska) stem segments to elongate 100-200% 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-IAA indicate that auxin is free from some previously unavailable pool during O2-limited treatments. Apparently 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.