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PLANT PHYSIOLOGY , Vol 106, Issue 3 1007-1014, Copyright © 1994 by American Society of Plant Biologists

ENVIRONMENTAL AND STRESS PHYSIOLOGY

Ozone, Sulfur Dioxide, and Ultraviolet B Have Similar Effects on mRNA Accumulation of Antioxidant Genes in Nicotiana plumbaginifolia L

H. Willekens, W. Van Camp, M. Van Montagu, D. Inze, C. Langebartels and H. Sandermann Jr
Laboratorium voor Genetica (H.W., W.V.C., M.V.M.) and Laboratoire Associe de l'Institut National de la Recherche Agronomique (France)(D.I.), Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium

We have studied the expression of antioxidant genes in response to near ambient conditions of O3, SO2, and ultraviolet B (UV-B) in Nicotiana plumbaginifolia L. The genes analyzed encode four different superoxide dismutases (SODs), three catalases (Cat1, Cat2, and Cat3), the cytosolic ascorbate peroxidase (cyt APx), and glutathione peroxidase (GPx). The experimental setup for each treatment was essentially the same and caused no visible damage, thus allowing direct comparison of the different stress responses. Our data showed that the effects of O3, SO2, and UV-B on the antioxidant genes are very similar, although the response to SO2 is generally less pronounced and delayed. The effects of the different stresses are characterized by a decline in Cat1, a moderate increase in Cat3, and a strong increase in Cat2 and GPx. Remarkably, SODs and cyt APx were not affected. Analysis of SOD and APx expression in the ozone-sensitive Nicotiana tabacum L. cv PBD6 revealed that induction of the cytosolic copper/zinc SOD and cyt APx occurs only with the onset of visible damage. It is proposed that alterations in mRNA levels of catalases and GPx, but not of SODs and cyt APx, form part of the initial antioxidant response to O3, SO2, and UV-B in Nicotiana.


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