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JXB Advance Access originally published online on May 11, 2009
Journal of Experimental Botany 2009 60(8):2315-2323; doi:10.1093/jxb/erp115
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

This article appears in the following Journal of Experimental Botany issue: Special Issue: Mesophyll conductance to CO2: mechanisms, modelling, and ecological implications [View the issue table of contents]

Responses of gm to Single Environmental Factors

Mesophyll conductance to CO2 transport estimated by two independent methods: effect of variable CO2 concentration and abscisic acid

D. Vrábl1,*, M. Vasková1, M. Hronková1,2, J. Flexas3 and J. Santrucek1,2

1The University of South Bohemia, Faculty of Science, Department of Plant Physiology, Branisovská 31, Ceské Budejovice, CZ-370-05, Czech Republic
2Institute of Plant Molecular Biology, Biology Centre of the Academy of Sciences of the Czech Republic, Branisovská 31, Ceské Budejovice, CZ-370-05, Czech Republic
3Research Group on ‘Plant Biology under Mediterranean Conditions’, Departament de Biologia, Universitat de les Illes Balears. Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Balears

* To whom correspondence should be addressed. E-mail: daniel.vrabl{at}prf.jcu.cz

Mesophyll conductance (gm) and stomatal conductance (gs) are two crucial components of the diffusive limitation of photosynthesis. Variation of gm in response to CO2 concentration was evaluated by using two independent methods based on measurements of variable electron transport rate (J) and instantaneous carbon isotope discrimination, respectively. Both methods of gm estimation showed a very similar shape of the gm/Ci relationship, with an initial increase at low substomatal CO2 concentrations (Ci), a peak at 180–200 µmol mol–1 Ci, and a subsequent decrease at higher Ci. A good correlation was observed between values of gm estimated from the two methods, except when Ci <200 µmol mol–1, suggesting that the initial increase of gm at low Ci was probably due to unreliable estimates over that range of Ci. Plants were also treated with abscisic acid (ABA), which induced a reduction in gs without significantly affecting the rate of photosynthesis, gm or the photosynthetic capacity. The present results confirm, using two independent methods, that gm is strongly sensitive to Ci, and that the relationship between gs and gm is not conservative, differing between control and ABA-treated plants.

Key words: Abscisic acid, carbon dioxide, Helianthus annuus, mesophyll conductance, photosynthesis

Received 17 February 2009; Accepted 16 March 2009


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