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Environmental adaptation in stomatal size independent of the effects of genome size

Citation

Jordan, GJ and Carpenter, RJ and Koutoulis, A and Price, A and Brodribb, TJ, Environmental adaptation in stomatal size independent of the effects of genome size, New Phytologist, 205, (2) pp. 608-617. ISSN 0028-646X (2014) [Refereed Article]


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Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.1111/nph.13076

Abstract


  • Cell sizes are linked across multiple tissues, including stomata, and this variation is closely correlated with genome size. These associations raise the question of whether generic changes in cell size cause suboptimal changes in stomata, requiring subsequent evolution under selection for stomatal size.
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  • We tested the relationships among guard cell length, genome size and vegetation type using phylogenetically independent analyses on 67 species of the ecologically and structurally diverse family, Proteaceae. We also compared how genome and stomatal sizes varied at ancient (among genera) and more recent (within genus) levels.
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  • The observed 60-fold range in genome size in Proteaceae largely reflected the mean chromosome size. Compared with variation among genera, genome size varied much less within genera (< 6% of total variance) than stomatal size, implying evolution in stomatal size subsequent to changes in genome size. Open vegetation and closed forest had significantly different relationships between stomatal and genome sizes.
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  • Ancient changes in genome size clearly influenced stomatal size in Proteaceae, but adaptation to habitat strongly modified the genome–stomatal size relationship. Direct adaptation to the environment in stomatal size argues that new proxies for past concentrations of atmospheric CO2 that incorporate stomatal size are superior to older models based solely on stomatal frequency.

Item Details

Item Type:Refereed Article
Keywords:adaptation, cell size, chromosome size, CO2, genome size, palaeoproxy, Proteaceae, stomata
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Cell and Molecular Biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Ornamentals, Natives, Flowers and Nursery Plants
Author:Jordan, GJ (Associate Professor Greg Jordan)
Author:Carpenter, RJ (Dr Raymond Carpenter)
Author:Koutoulis, A (Professor Anthony Koutoulis)
Author:Price, A (Mrs Aina Price)
Author:Brodribb, TJ (Dr Tim Brodribb)
ID Code:95878
Year Published:2014
Web of Science® Times Cited:13
Deposited By:Plant Science
Deposited On:2014-10-09
Last Modified:2017-11-01
Downloads:176 View Download Statistics

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