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PLANT PHYSIOLOGY , Vol 113, Issue 1 39-44, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Ultraviolet B-Sensitive Rice Cultivar Deficient in Cyclobutyl Pyrimidine Dimer Repair
J. Hidema, T. Kumagai, J. C. Sutherland and B. M. Sutherland
Institute of Genetic Ecology, Tohoku University, Katahira, Aoba, Sendai 980, Japan (J.H., T.K.)
Repair of cyclobutyl pyrimidine dimers (CPDs) in DNA is essential in most
organisms to prevent biological damage by ultraviolet (UV) light. In higher
plants tested thus far, UV-sensitive strains had higher initial damage
levels or deficient repair of nondimer DNA lesions but normal CPD repair.
This suggested that CPDs might not be important for biological lesions. The
photosynthetic apparatus has also been proposed as a critical target. We
have analyzed CPD induction and repair in the UV-sensitive rice (Oryza
sativa L.) cultivar Norin 1 and its close relative UV-resistant Sasanishiki
using alkaline agarose gel electrophoresis. Norin 1 is deficient in
cyclobutyl pyrimidine dimer photoreactivation and excision; thus, UV
sensitivity correlates with deficient dimer repair.
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