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Journal of Experimental Botany, Vol. 51, No. 343, pp. 265-274, February 2000
© 2000 Oxford University Press

Influence of high light and UV-B radiation on photosynthesis and D1 turnover in atrazine-tolerant and -sensitive cultivars of Brassica napus

Louise C. Olsson1, Laure Fraysse2 and Janet F. Bornman1,3

1 Department of Plant Physiology, Lund University, Box 117, S-221 00 Lund, Sweden
2 Department of Plant Cell Biology, Lund University, Box 7007, S-220 07 Lund, Sweden

An atrazine-tolerant mutant and an atrazine-sensitive cultivar of Brassica napus L. were grown under visible radiation (400 µmol m-2 s-1, photosynthetically active radiation, PAR) and then subjected to treatment conditions. These included short-term high PAR (1600 µmol m-2 s-1) which was given for 4 h either alone or in combination with an enhanced level of UV-BBE radiation (4.6 kJ m-2 h-1 biologically effective UV-B, 280–320 nm). Recovery from the radiation treatment was studied for 4 h under the light conditions for growth. Since it is known that the atrazine-tolerant mutant is susceptible to photoinhibition, one of the aims of the present study was to determine the effects of a supplemental, enhanced level of UV-B radiation with regard to the mutant. The results indicate an additive effect of UV-B radiation on Fv/Fm, photochemical yield and photosynthetic oxygen evolution during both exposure and recovery, and also a higher susceptibility of the mutant to photoinhibitory PAR conditions alone and in combination with UV-B, which may have implications in a changing environment. Both cultivars also showed a higher D1 turnover during the radiation stress than during recovery, as shown by immunoblotting and 35S-methionine incorporation measurements.

Key words: Atrazine, Brassica napus, D1 protein, fluorescence, herbicide tolerance, oxygen evolution, photoinhibition, ultraviolet-B radiation.


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