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Plant Physiol, October 1999, Vol. 121, pp. 489-496

Characterization of Stomatal Closure Caused by Ultraviolet-B Radiation1

Salvador Nogués,2 Damian J. Allen,3 James I.L. Morison, and Neil R. Baker*

Department of Biological Sciences, University of Essex, Colchester CO4 3SQ, United Kingdom

The effects of ultraviolet-B (UV-B) radiation on stomatal conductance (gs) in pea (Pisum sativum L.), commelina (Commelina communis L.), and oilseed rape (Brassica napus L.) plants were investigated. Plants were grown in a greenhouse either with three different high ratios of UV-B to photosynthetically active radiation or with no UV-B radiation. Pea plants grown in the highest UV-B radiation (0.63 W m-2) exhibited a substantial decrease of adaxial and abaxial gs (approximately 80% and 40%, respectively). With growth in 0.30 W m-2 of UV-B adaxial gs was decreased by 23%, with no effect on abaxial gs, and lower UV-B irradiance of 0.21 W m-2 had no effect on either surface. Although abaxial gs increased when leaves were turned over in control plants, it did not in plants grown with the highest UV-B. Adaxial gs in commelina and oilseed rape also decreased on exposure to high UV-B (0.63 W m-2). For previously unexposed pea plants the time course of the effect of UV-B on gs was slow, with a lag of approximately 4 h, and a time constant of approximately 3 h. We conclude that there is a direct effect of UV-B on stomata in addition to that caused by changes in mesophyll photosynthesis.

1 This research was supported partly by a research grant from Generalitat de Catalunya (grant no. 1996BEAI300222 to S.N.). D.J.A. received a research studentship from the UK Biotechnology and Biological Sciences Research Council.

2 Present address: Departament de Biologia Vegetal, Unitat de Fisiologia Vegetal, Universitat de Barcelona, 08028 Barcelona, Spain.

3 Present address: Photosynthesis Research Unit, Agricultural Research Service/U.S. Department of Agriculture and Department of Plant Biology, University of Illinois, Urbana, IL 61801-3838.

* Corresponding author: e-mail baken{at}essex.ac.uk; fax 44-1206-873416.

© 1999 American Society of Plant Physiologists


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