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Environment sensing in spring-dispersed seeds of a winter annual Arabidopsis influences the regulation of dormancy to align germination potential with seasonal changes
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Footitt, Steven, Clay, Heather A., Dent, Katherine and Finch-Savage, William E. (2014) Environment sensing in spring-dispersed seeds of a winter annual Arabidopsis influences the regulation of dormancy to align germination potential with seasonal changes. New Phytologist, Volume 202 (Number 3). pp. 929-939. doi:10.1111/nph.12694 ISSN 0028-646X.
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Official URL: http://dx.doi.org/10.1111/nph.12694
Abstract
Seed dormancy cycling plays a crucial role in the lifecycle timing of many plants. Little is known of how the seeds respond to the soil seed bank environment following dispersal in spring into the short-term seed bank before seedling emergence in autumn. Seeds of the winter annual Arabidopsis ecotype Cvi were buried in field soils in spring and recovered monthly until autumn and their molecular eco-physiological responses were recorded.
DOG1 expression is initially low and then increases as dormancy increases. MFT expression is negatively correlated with germination potential. Abscisic acid (ABA) and gibberellin (GA) signalling responds rapidly following burial and adjusts to the seasonal change in soil temperature. Collectively these changes align germination potential with the optimum climate space for seedling emergence. Seeds naturally dispersed to the soil in spring enter a shallow dormancy cycle dominated by spatial sensing that adjusts germination potential to the maximum when soil environment is most favourable for germination and seedling emergence upon soil disturbance. This behaviour differs subtly from that of seeds overwintered in the soil seed bank to spread the period of potential germination in the seed population (existing seed bank and newly dispersed). As soil temperature declines in autumn, deep dormancy is re-imposed as seeds become part of the persistent seed bank.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QK Botany | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||||
Library of Congress Subject Headings (LCSH): | Arabidopsis -- Seeds -- Dormancy, Arabidopsis -- Ecophysiology | ||||||||||
Journal or Publication Title: | New Phytologist | ||||||||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||||
ISSN: | 0028-646X | ||||||||||
Official Date: | May 2014 | ||||||||||
Dates: |
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Volume: | Volume 202 | ||||||||||
Number: | Number 3 | ||||||||||
Page Range: | pp. 929-939 | ||||||||||
DOI: | 10.1111/nph.12694 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 26 December 2015 | ||||||||||
Date of first compliant Open Access: | 26 December 2015 | ||||||||||
Funder: | Great Britain. Department for Environment, Food and Rural Affairs (DEFRA), Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC) | ||||||||||
Grant number: | BB/I022201/1 (BBSRC) |
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