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Exploring seed longevity of UK native trees: implications for ex situ conservation

Published online by Cambridge University Press:  21 July 2020

Rachael M. Davies Open the ORCID record for Rachael M. Davies [Opens in a new window] ,
Alice R. Hudson ,
John B. Dickie ,
Charlotte Cook ,
Tom O'Hara  and
Clare Trivedi
Rachael M. Davies*
Affiliation:
Royal Botanic Gardens Kew, Millennium Seed Bank, Wakehurst Place, ArdinglyRH17 6TN, UK
Alice R. Hudson
Affiliation:
Royal Botanic Gardens Kew, Millennium Seed Bank, Wakehurst Place, ArdinglyRH17 6TN, UK
John B. Dickie
Affiliation:
Royal Botanic Gardens Kew, Millennium Seed Bank, Wakehurst Place, ArdinglyRH17 6TN, UK
Charlotte Cook
Affiliation:
The Pirbright Institute, Ash Road, Pirbright, WokingGU24 0NF, UK
Tom O'Hara
Affiliation:
John Innes Centre, Norwich Research Park, Colney Lane, NorwichNR4 7UH, UK
Clare Trivedi
Affiliation:
Royal Botanic Gardens Kew, Millennium Seed Bank, Wakehurst Place, ArdinglyRH17 6TN, UK
*
Author for correspondence: Rachael M. Davies, E-mail: rachael.davies@kew.org
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Abstract

UK trees require increased conservation efforts due to sparse and fragmented populations. Ex situ conservation, including seed banking, can be used to better manage these issues. We conducted accelerated ageing tests on seeds of 22 UK native woody species, in order to assess their likely longevity and optimize their conservation in a seed bank. Germination at four ageing time points was determined to construct survival curves, and it was concluded that multiple samples within a species showed comparable responses for most species tested, except for Fraxinus excelsior. Of all species studied, one could be classified as very short-lived, four as short-lived and 17 as medium, with none exceeding the medium category. The most important finding of this manuscript is that although some taxonomic trends were observed, the results indicate the need for caution when making broad conclusions on potential seed storage life at a species, genus or family level. Longevity predictions were compared to actual performance of older collections held in long-term storage at the Millennium Seed Bank, Kew. Although most collections remain high in viability in storage after more than 20 years, for short-lived species at least, there is some indication that accelerated ageing predicts longevity in seed bank conditions. For species with reduced potential longevity, such as Fagus sylvatica and Ulmus glabra, additional storage options are recommended for long-term gene banking.

Keywords

ex situ conservationseed bankingseed longevitytemperate trees
Type
Research Paper
Information
Seed Science Research , Volume 30 , Issue 2 , June 2020 , pp. 101 - 111
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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