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Subcellular organization and metabolic activity during the development of seeds that attain different levels of desiccation tolerance

Published online by Cambridge University Press:  19 September 2008

Jill M. Farrant ,
N. W. Pammenter ,
Patricia Berjak  and
Christina Walters
Jill M. Farrant
Affiliation:
Department of Botany, University of Cape Town, Private Bag, Rondebosch, 7700South Africa
N. W. Pammenter*
Affiliation:
Department of Biology, University of Natal, Durban, 4041South Africa
Patricia Berjak
Affiliation:
Department of Biology, University of Natal, Durban, 4041South Africa
Christina Walters
Affiliation:
USDA Agricultural Research Service, National Seed Storage Laboratory, 1111 S. Mason Street, Fort Collins, CO 80521–4500, USA
*
*Correspondence
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Abstract

Water contents, desiccation tolerance, respiratory rates and subcellular characteristics of three contrasting seed types were studied during development. Avicennia marina (a tropical wetland species) and Aesculus hippocastanum (a temperate species) produce recalcitrant seeds and Phaseolus vulgaris produces orthodox seeds. During development, A. hippocastanum and P. vulgaris seeds showed a decline in water content and respiration rate with a concomitant increase in desiccation tolerance. These parameters did not change during the development of A. marina seeds once they had become germinable. There was a decrease in the degree of vacuolation and an increase in the deposition of insoluble reserves in A. hippocastanum and P. vulgaris seeds, while A. marina seeds remained highly vacuolated and did not accumulate insoluble reserves. Mitochondria and endomembranes degenerated during the development of A. hippocastanum and P. vulgaris seeds, but remained unchanged in A. marina seeds. The data are consistent with the hypothesis that extensive vacuolation and high metabolic rates contribute to desiccation sensitivity. However, the development of recalcitrant A. hippocastanum seeds is similar to that of orthodox P. vulgaris seeds. These data are in accord with the concept of seed recalcitrance being a consequence of truncated development. The results suggest that there may be three categories of seeds: orthodox seeds which develop desiccation tolerance, seeds which show similar development to orthodox seeds, but are shed before desiccation tolerance is well developed, and seeds which show no developmental trends giving rise to increased tolerance.

Keywords

desiccation tolerancedevelopmentorthodoxrecalcitrantseed
Type
Physiology
Information
Seed Science Research , Volume 7 , Issue 2 , June 1997 , pp. 135 - 144
Copyright
Copyright © Cambridge University Press 1997

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