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Polyamines and seed germination

Published online by Cambridge University Press:  19 September 2008

A.J. Matilla*
Affiliation:
Department of Plant Biology, Laboratory of Plant Physiology, Granada University, Granada, Spain
*
*Correspondence

Abstract

This review examines the presence of free and bound PAs during the life cycle of seeds. Although data are still rather scarce, PAs, present, but with an unknown function during embryogenesis, are accumulated in relatively high quantities in mature dry seeds of some species. PA concentration can be altered by the process of stratification, and PAs are synthesized in growing organs after germination, but it is also possible that the reserve organs synthesize and export some types of PA to the axis. This metabolism and sink-source relationship depend on the germination conditions and on the greater or lesser presence of enzymes related to synthesis (ADC, ODC, LDC and AdoMetDC) and degradation (DAO and PAO) of free PAs. The biochemical mechanism binding the PAs to a series of compounds of low and high molecular weight is currently unknown in seeds. The present study also considers intra- and intercellular compartmentation of free and bound PAs in growing axes and the physiological implications of the ethylene-production pathway in relation to seed behaviour.

Information

Type
Special Review
Copyright
Copyright © Cambridge University Press 1996

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