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  The sucrose-to-malate ratio correlates with the faster CO2 and light stomatal responses of angiosperms compared to ferns

Lima, V. F., Anjos, L. d., Medeiros, D., Cândido-Sobrinho, S. A., de Souza, L. P., Gago, J., et al. (2019). The sucrose-to-malate ratio correlates with the faster CO2 and light stomatal responses of angiosperms compared to ferns. New Phytologist, 223(4), 1873-1887. doi:10.1111/nph.15927.

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Lima, Valéria F.1, Author
Anjos, Letícia dos1, Author
Medeiros, D.B.2, Author              
Cândido-Sobrinho, Silvio A.1, Author
de Souza, L. P.2, Author              
Gago, Jorge1, Author
Fernie, A. R.2, Author              
Daloso, Danilo M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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Free keywords: angiosperms, ferns, stomata, stomata evolution, stomatal movement regulation
 Abstract: Summary Stomatal responses to environmental signals differ substantially between ferns and angiosperms. However, the mechanisms that lead to such different responses remain unclear. Here we investigated the extent to which leaf metabolism contributes to coordinate the differential stomatal behaviour among ferns and angiosperms. Stomata from all species were responsive to light and CO2 transitions. However, fern stomatal responses were slower and minor in both absolute and relative terms. Angiosperms have higher stomatal density, but this is not correlated with speed of stomatal closure. The metabolic responses throughout the diel course and under different CO2 conditions differ substantially among ferns and angiosperms. Higher sucrose content and an increased sucrose-to-malate ratio during high CO2-induced stomatal closure was observed in angiosperms compared to ferns. Furthermore, the speed of stomatal closure was positively and negatively correlated with sugars and organic acids, respectively, suggesting that the balance between sugars and organic acids aids in explaining the faster stomatal responses of angiosperms. Our results suggest that mesophyll-derived metabolic signals, especially those associated with sucrose and malate, may also be important to modulate the differential stomatal behaviour between ferns and angiosperms, providing important new information that helps in understanding the metabolism-mediated mechanisms regulating stomatal movements across land plant evolution.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1111/nph.15927
BibTex Citekey: doi:10.1111/nph.15927
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Title: New Phytologist
  Other : New Phytol.
Source Genre: Journal
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Publ. Info: London : Academic Press.
Pages: - Volume / Issue: 223 (4) Sequence Number: - Start / End Page: 1873 - 1887 Identifier: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695