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THE PLANT CELL, Vol 7, Issue 2 203-212, Copyright © 1995 by American Society of Plant Biologists
UV-B-Induced PR-1 Accumulation Is Mediated by Active Oxygen Species
R. Green and R. Fluhr
Department of Plant Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel
Depletion of the stratospheric ozone layer may result in an increase in the
levels of potentially harmful UV-B radiation reaching the surface of the
earth. We have found that UV-B is a potent inducer of the plant
pathogenesis-related protein PR-1 in tobacco leaves. UV-B fluences required
for PR-1 accumulation are similar to those of other UV-B-induced responses.
The UV-B-induced PR-1 accumulation was confined precisely to the irradiated
area of the leaf but displayed no leaf tissue specificity. A study of some
of the possible components of the signal transduction pathway between UV-B
and PR-1 induction showed that photosynthetic processes are not essential,
and photoreversible DNA damage is not involved. Antioxidants and
cycloheximide were able to block the induction of PR-1 by UV-B, and
treatment of leaves with a generator of reactive oxygen resulted in the
accumulation of PR-1 protein. These results demonstrate an absolute
requirement for active oxygen species and protein synthesis in this UV-B
signal transduction pathway. In contrast, we also show that other
elicitors, notably salicylic acid, are able to elicit PR-1 via nonreactive
oxygen species-requiring pathways.
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