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Ultraviolet-B Radiation Effects on Water Relations, Leaf Development, and Photosynthesis in Droughted Pea Plants1

Salvador Nogués, Damian J. Allen, 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 water relations, leaf development, and gas-exchange characteristics in pea (Pisum sativum L. cv Meteor) plants subjected to drought were investigated. Plants grown throughout their development under a high irradiance of UV-B radiation (0.63 W m-2) were compared with those grown without UV-B radiation, and after 12 d one-half of the plants were subjected to 24 d of drought that resulted in mild water stress. UV-B radiation resulted in a decrease of adaxial stomatal conductance by approximately 65%, increasing stomatal limitation of CO2 uptake by 10 to 15%. However, there was no loss of mesophyll light-saturated photosynthetic activity. Growth in UV-B radiation resulted in large reductions of leaf area and plant biomass, which were associated with a decline in leaf cell numbers and cell division. UV-B radiation also inhibited epidermal cell expansion of the exposed surface of leaves. There was an interaction between UV-B radiation and drought treatments: UV-B radiation both delayed and reduced the severity of drought stress through reductions in plant water-loss rates, stomatal conductance, and leaf area.

1   This research was supported by a research grant to N.R.B. from the UK Natural Environment Research Council and to S.N. from the Generalitat de Catalunya (1996BEAI300222). D.J.A. was the recipient of a research studentship from the UK Biotechnology and Biological Sciences Research Council.
*   Corresponding author; e-mail baken{at}essex.ac.uk; fax 44-1206-873416.

Plant Physiol. (1998) 117: 173-181
Copyright Clearance Center:   0032-0889/98/117/0173/09
© 1998 American Society of Plant Physiologists




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