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A review of recalcitrant seed physiology in relation to desiccation-tolerance mechanisms

Published online by Cambridge University Press:  22 February 2007

N. W. Pammenter  and
Patricia Berjak
N. W. Pammenter*
Affiliation:
Plant Cell Biology Research Unit, School of Life and Environmental Sciences, University of Natal, Durban, 4041, South Africa
Patricia Berjak
Affiliation:
Plant Cell Biology Research Unit, School of Life and Environmental Sciences, University of Natal, Durban, 4041, South Africa
*
*Correspondence Email: pammente@biology.und.ac.za; berjak@biology.und.ac.za
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Abstract

A suite of mechanisms or processes that together have been implicated in the acquisition and maintenance of desiccation tolerance in orthodox seeds is discussed in the context of the behaviour of desiccation-sensitive seeds, and where appropriate, parallels are drawn with the situation in vegetative plant tissues that tolerate dehydration. Factors included are: physical characteristics of cells and intracellular constituents; insoluble reserve accumulation; intracellular de-differentiation; metabolic ‘switching off’; presence, and efficient operation, of antioxidant systems; accumulation of putatively protective substances including LEAs, sucrose and other oligosaccharides, as well as amphipathic molecules; the presence and role of oleosins; and the presence and operation of repair systems during rehydration. The variable response to dehydration shown by desiccation-sensitive seeds is considered in terms of the absence or incomplete expression of this suite of mechanisms or processes.

Three categories of damage are envisaged: (i) reduction in cell volume which can lead to mechanical damage; (ii) aqueous-based degradative processes, probably consequent upon deranged metabolism at intermediate water contents. This is termed ‘metabolism-induced damage’ and its extent will depend upon the metabolic rate and the rate of dehydration; and (iii) the removal of water intimately associated with macromolecular surfaces leading to denaturation: this is referred to as desiccation damage sensu stricto. The effects of drying rate and the maturity status of seeds are considered in relation to the responses to dehydration, leading to the conclusion that the concept of critical water contents on a species basis is inappropriate. Viewing seed postharvest physiology in terms of a continuum of behaviour is considered to be more realistic than attempting precise categorization.

Rapid dehydration of excised embryonic axes (or other explants) from desiccation-sensitive seeds permits retention of viability (in the short term) to water contents approaching the level of non-freezable water. This opens up the possibility of long-term conservation, by cryopreservation techniques, of the genetic resources of species producing non-orthodox seeds.

Keywords

dehydration ratedesiccation-sensitivitydesiccation-tolerancedevelopmental statusintermediateorthodoxrecalcitrantresurrection plantseed
Type
Invited Review
Information
Seed Science Research , Volume 9 , Issue 1 , January 1999 , pp. 13 - 37
Copyright
Copyright © Cambridge University Press 1999

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