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Annals of Botany 89: 887-894, 2002
© 2002 Annals of Botany Company

Photosynthetic Carbon Reduction and Carbon Oxidation Cycles are the Main Electron Sinks for Photosystem II Activity During a Mild Drought

GABRIEL CORNIC*,1 and CHANTAL FRESNEAU2

1Department of Plant Biology, University of Illinois, ERML 190, 1206 West Gregory Drive, Urbana, IL 61801, USA and 2Laboratoire d’écophysiologie, ESE, Bât. 362, UFR Scientifique d’Orsay, Université de Paris XI, 91 405, Orsay Cedex, France

* For correspondence. Laboratoire d’écophysiologie, ESE, Bât. 362, UFR Scientifique d’Orsay, Université de Paris XI, 91405, Orsay Cedex, France. Fax (33) 1 69157238, e-mail gabriel.cornic{at}eco.u-psud.fr

Received: 20 May 2001; Returned for revision: 17 October 2001; Accepted: 3 December 2001.

Stomatal closure can explain the inhibition of net CO2 uptake by a leaf subjected to a mild drought: the photosynthetic apparatus appears resistant to lack of water. Changes in both the water content of leaves maintained in a constant environment and the ambient CO2 molar fraction during measurements on well-hydrated leaves lead to similar effects on net CO2 uptake and whole chain electron transport as estimated by leaf chlorophyll fluorescence measurements. In particular, it is shown that photosystem II (PSII) functioning and its regulation are not qualitatively changed during desiccation and that the variations in PSII photochemistry can simply be understood by changes in substrate availability in this condition. Moreover, an analysis of the literature shows that when inhibition of net CO2 uptake by C3 leaves under drought (Phaseolus vulgaris L., Helianthus annus L. and Solanum tuberosum L.) was lower than 80 %, elevated CO2 completely restored the photosynthetic capacity. The CO2 molar fraction in the chloroplasts declines as stomata close in drying leaves. As a consequence, in C3 plants, ribulose-1,5-bisphosphate oxygenation increases and becomes the main sink for photosynthetic electrons. Depending on the prevailing photon flux density, the O2 uptake through photorespiratory activity can entirely replace carbon dioxide as an electron acceptor, or not. The rate of the Mehler reaction remains low and unchanged during desiccation. However, drought could also involve CO2-sensitive modification of the photosynthetic metabolism depending on plant growth conditions and possibly also on plant species.

Key words: Chloroplastic carbon dioxide molar ratio, drought stress, high CO2 effect, Lavatera trimestris L. var. splendens, Pisum sativum L., photorespiration, photosynthesis, stomatal effect.


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