Article (Scientific journals)
Photosynthesis-dependent/independent control of stomatal responses to CO<inf>2</inf> in mutant barley with surplus electron transport capacity and reduced SLAH3 anion channel transcript
Córdoba Jacoste, Francisco Javier; Molina-Cano, J.-L.; Pérez, P. et al.
2015In Plant Science, 239, p. 15-25
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Keywords :
CO<inf>2</inf>; Photosynthetic electron transport; Signalling; SLAH3; Stomatal conductance; Hordeum; Hordeum vulgare; Carbon Dioxide; Electron Transport; Gene Expression Regulation, Plant; Light; Mutation; Photosynthesis; Plant Leaves; Plant Proteins; Plant Stomata; Ribulose-Bisphosphate Carboxylase; Voltage-Dependent Anion Channels
Abstract :
[en] The mechanisms of stomatal sensitivity to CO<inf>2</inf> are yet to be fully understood. The role of photosynthetic and non-photosynthetic factors in stomatal responses to CO<inf>2</inf> was investigated in wild-type barley (Hordeum vulgare var. Graphic) and in a mutant (G132) with decreased photochemical and Rubisco capacities. The CO<inf>2</inf> and DCMU responses of stomatal conductance (g<inf>s</inf>), gas exchange, chlorophyll fluorescence and levels of ATP, with a putative transcript for stomatal opening were analysed. G132 had greater g<inf>s</inf> than the wild-type, despite lower photosynthesis rates and higher intercellular CO<inf>2</inf> concentrations (C<inf>i</inf>). The mutant had Rubisco-limited photosynthesis at very high CO<inf>2</inf> levels, and higher ATP contents than the wild-type. Stomatal sensitivity to CO<inf>2</inf> under red light was lower in G132 than in the wild-type, both in photosynthesizing and DCMU-inhibited leaves. Under constant C<inf>i</inf> and red light, stomatal sensitivity to DCMU inhibition was higher in G132. The levels of a SLAH3-like slow anion channel transcript, involved in stomatal closure, decreased sharply in G132. The results suggest that stomatal responses to CO<inf>2</inf> depend partly on the balance of photosynthetic electron transport to carbon assimilation capacities, but are partially regulated by the CO<inf>2</inf> signalling network. High g<inf>s</inf> can improve the adaptation to climate change in well-watered conditions. © 2015 Elsevier Ireland Ltd.
Disciplines :
Biochemistry, biophysics & molecular biology
Genetics & genetic processes
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Córdoba Jacoste, Francisco Javier ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique et physiologie des microalgues
Molina-Cano, J.-L.;  IRTA (Institute for Food and Agricultural Research and Technology), Field Crops, Av. Alcalde Rovira i Roure, 191, Lérida, Spain
Pérez, P.;  Institute of Natural Resources and Agrobiology of Salamanca, IRNASA-CSIC, Cordel de Merinas, 40, Salamanca, Spain
Morcuende, R.;  Institute of Natural Resources and Agrobiology of Salamanca, IRNASA-CSIC, Cordel de Merinas, 40, Salamanca, Spain
Moralejo, M.;  Universidad de Lleida, Av. Alcalde Rovira i Roure, 191, Lérida, Spain
Savé, R.;  IRTA, Environmental Horticulture, Torre Marimon, Caldes de Montbui, Barcelona, Spain
Martínez-Carrasco, R.;  Institute of Natural Resources and Agrobiology of Salamanca, IRNASA-CSIC, Cordel de Merinas, 40, Salamanca, Spain
Title :
Photosynthesis-dependent/independent control of stomatal responses to CO<inf>2</inf> in mutant barley with surplus electron transport capacity and reduced SLAH3 anion channel transcript
Publication date :
2015
Journal title :
Plant Science
ISSN :
0168-9452
Publisher :
Elsevier Ireland Ltd
Volume :
239
Pages :
15-25
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2018

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