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The impact of global warming on germination and seedling emergence in Alliaria petiolata, a woodland species with dormancy loss dependent on low temperature
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Footitt, Steven, Huang, Ziyue, Ölcer-Footitt, Hülya, Clay, Heather A., Finch-Savage, William E. and Kranner, I. (2018) The impact of global warming on germination and seedling emergence in Alliaria petiolata, a woodland species with dormancy loss dependent on low temperature. Plant Biology, 20 (4). pp. 632-690. doi:10.1111/plb.12720 ISSN 1435-8603.
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Official URL: http://dx.doi.org/10.1111/plb.12720
Abstract
The impact of global warming on seed dormancy loss and germination was investigated in Alliaria petiolata (garlic mustard), a common woodland/hedgerow plant in Eurasia, considered invasive in North America. Increased temperature may have serious implications, since seeds of this species germinate and emerge at low temperatures early in spring to establish and grow before canopy development of competing species.
Dormancy was evaluated in seeds buried in field soils. Seedling emergence was also investigated in the field, and in a thermogradient tunnel under global warming scenarios representing predicted UK air temperatures through to 2080.
Dormancy was simple, and its relief required the accumulation of low temperature chilling time. Under a global warming scenario, dormancy relief and seedling emergence declined and seed mortality increased as soil temperature increased along a thermal gradient. Seedling emergence advanced with soil temperature, peaking 8 days earlier under 2080 conditions.
The results indicate that as mean temperature increases due to global warming, the chilling requirement for dormancy relief may not be fully satisfied, but seedling emergence will continue from low dormancy seeds in the population. Adaptation resulting from selection of this low dormancy proportion is likely to reduce the overall population chilling requirement. Seedling emergence is also likely to keep pace with the advancement of biological spring, enabling A. petiolata to maintain its strategy of establishment before the woodland canopy closes. However, this potential for adaptation may be countered by increased seed mortality in the seed bank as soils warm.
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): | Garlic mustard (Plant) , Plant ecology, Plants -- Environmental aspects, Seeds -- Ecology., Plants -- Climatic factors. | ||||||||
Journal or Publication Title: | Plant Biology | ||||||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||
ISSN: | 1435-8603 | ||||||||
Official Date: | July 2018 | ||||||||
Dates: |
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Volume: | 20 | ||||||||
Number: | 4 | ||||||||
Page Range: | pp. 632-690 | ||||||||
DOI: | 10.1111/plb.12720 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 26 April 2018 | ||||||||
Date of first compliant Open Access: | 16 April 2019 | ||||||||
RIOXX Funder/Project Grant: |
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