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  5. Does size matter? Atmospheric CO2 may be a stronger driver of stomatal closing rate than stomatal size in taxa that diversified under low CO2
 
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Does size matter? Atmospheric CO2 may be a stronger driver of stomatal closing rate than stomatal size in taxa that diversified under low CO2

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Author(s)
Elliott-Kingston, Caroline 
Haworth, Matthew 
Yearsley, Jonathan M. 
McElwain, Jennifer C. 
et al. 
Uri
http://hdl.handle.net/10197/7804
Date Issued
2016
Date Available
19T14:12:23Z August 2016
Abstract
(1) One strategy for plants to optimise stomatal function is to open and close their stomata quickly in response to environmental signals.  It is generally assumed that small stomata can alter aperture faster than large stomata. (2) We tested the hypothesis that species with small stomata close faster than species with larger stomata in response to darkness by comparing rate of stomatal closure across an evolutionary range of species including ferns, cycads, conifers and angiosperms under controlled ambient conditions (380ppm CO2; 20.9% O2).  (3) The two species with fastest half-closure time and the two species with slowest half-closure time had large stomata while the remaining three species had small stomata, implying that closing rate was not correlated with stomatal size in these species. Neither was response time correlated with stomatal density, phylogeny, functional group or life strategy. (4) Our results suggest that past atmospheric CO2 concentration during time of taxa diversification may influence stomatal response time.  We show that species which last diversified under low or declining atmospheric CO2 concentration close stomata faster than species that last diversified in a high CO2 world.  Low atmospheric [CO2] during taxa diversification may have placed a selection pressure on plants to accelerate stomatal closing to maintain adequate internal CO2 and optimise water use efficiency.
Sponsorship
European Research Council
Irish Research Council for Science, Engineering and Technology
Other Sponsorship
EU Marie Curie Excellence Grant
EU Marie Curie Intra-European Fellowship
Type of Material
Journal Article
Publisher
Frontiers Media
Journal
Frontiers in Plant Science
Volume
7
Keywords
  • Stomata

  • Half-closure time in ...

  • Stomatal size

  • Atmospheric CO2 conce...

  • Time of taxa diversif...

DOI
10.3389/fpls.2016.01253
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Agriculture and Food Science Research Collection
Scopus© citations
67
Acquisition Date
Feb 3, 2023
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1964
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