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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Show simple item record Elliott-Kingston, Caroline Haworth, Matthew Yearsley, Jonathan M. McElwain, Jennifer C. et al. 2016-08-19T14:12:23Z 2016-08-19T14:12:23Z 2016
dc.identifier.citation Frontiers in Plant Science en
dc.description.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. en
dc.description.sponsorship European Research Council en
dc.description.sponsorship Irish Research Council for Science, Engineering and Technology en
dc.language.iso en en
dc.publisher Frontiers Media en
dc.rights This cocument is Protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission. en
dc.subject Stomata en
dc.subject Half-closure time in response to darkness en
dc.subject Stomatal size en
dc.subject Atmospheric CO2 concentration en
dc.subject Time of taxa diversification en
dc.title Does size matter? Atmospheric CO2 may be a stronger driver of stomatal closing rate than stomatal size in taxa that diversified under low CO2 en
dc.type Journal Article en
dc.status Peer reviewed en
dc.identifier.volume 7
dc.identifier.doi 10.3389/fpls.2016.01253
dc.neeo.contributor Elliott-Kingston|Caroline|aut|
dc.neeo.contributor Haworth|Matthew|aut|
dc.neeo.contributor Yearsley|Jonathan M.|aut|
dc.neeo.contributor McElwain|Jennifer C.|aut|
dc.neeo.contributor et al.||aut|
dc.description.othersponsorship EU Marie Curie Excellence Grant en
dc.description.othersponsorship EU Marie Curie Intra-European Fellowship en
dc.internal.rmsid 632853274 2016-08-02T13:54:08Z

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