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Evolutionary and ecological aspects of recalcitrant seed biology

Published online by Cambridge University Press:  22 February 2007

N.W. Pammenter  and
Patricia Berjak
N.W. Pammenter*
Affiliation:
School of Life and Environmental Sciences, George Campbell Building, University of Natal, Durban, 4041, South Africa
Patricia Berjak
Affiliation:
School of Life and Environmental Sciences, George Campbell Building, University of Natal, Durban, 4041, South Africa
*
*Correspondence Fax: +27-31-260-1195 Email: pammente@biology.und.ac.za
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Abstract

There is a substantial literature on the basic physiology and response to desiccation of recalcitrant seeds, but little is known about their ecology and even less of their evolutionary status. It is difficult to assess the response of early land plants to dehydration, but it is likely that desiccation tolerance in vegetative tissue arose concomitantly with the invasion of the land. Similarly, from the fossil record it is not possible to assess the desiccation response of early seeds, and furthermore, it is difficult to see phylogenetic relationships among species producing recalcitrant seeds. A consideration of the available evidence, however, suggests that the first seeds were desiccation-sensitive, but tolerance evolved early and probably a number of times, independently. The desiccation sensitivity and short life span (generally shorter than the interval between flowering) of recalcitrant seeds have implications in terms of regeneration ecology. A long-term soil seed bank as such does not exist; rather the seeds germinate and form a seedling bank. However, there is a wide range in post-shedding physiology among recalcitrant seed species, and although species producing recalcitrant seeds are common in the humid tropics, they do occur in habitats with more marked seasonal variation. Here regeneration strategies may be more specialized.

Keywords

Desiccation tolerancedesiccation sensitivityevolutionorthodoxrecalcitrantresurrection plantsseeds
Type
Research Article
Information
Seed Science Research , Volume 10 , Issue 3 , September 2000 , pp. 301 - 306
Copyright
Copyright © Cambridge University Press 2000

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