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Stress protein content of mature Brassica seeds and their germination performance

Published online by Cambridge University Press:  19 September 2008

Mary Bettey  and
W. E. Finch-Savage
Mary Bettey*
Affiliation:
Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK
W. E. Finch-Savage
Affiliation:
Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK
*
*: Fax: 01789 470552 E-mail mary.bettey@hri.ac.uk
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Abstract

Plants respond to sub-optimal conditions by the synthesis of specific ‘stress’ proteins, and these are thought to play a role in stress tolerance. Some of these proteins accumulate during late seed development, arguably to protect against damage during post-maturation drying and subsequent imbibition, prior to germination. Seed vigour is also determined during this late stage of seed development. High vigour seeds are those that can withstand the desiccation required for storage and successfully germinate under sub-optimal conditions to establish healthy seedlings. If stress proteins are involved in tolerating stress conditions, then they are likely to be important determinants of seed vigour. In this work the relationship between seed vigour (measured by seed germination performance following rapid aging, or under water stress) in Brassica oleracea var. capitata and the content of two classes of stress protein (dehydrins and a low molecular weight heat shock protein HSP17.6) at maturity was examined. Dehydrins did not show a positive relationship with seed performance. However, the protein HSP17.6 showed a positive correlation with seed performance, and a treatment that reduced the amount of this protein in the seed also caused a reduction in subsequent seed performance.

Keywords

Brassica oleracea varcapitatacabbagedehydrinsheat-shock proteinsseed vigourstress tolerance
Type
Physiology & Biochemistry
Information
Seed Science Research , Volume 8 , Issue 3 , September 1998 , pp. 347 - 355
Copyright
Copyright © Cambridge University Press 1998

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