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Journal of Experimental Botany, Vol. 52, No. 360, pp. 1417-1425, July 1, 2001
© 2001 Oxford University Press

Original Papers

Arabidopsis thaliana ecotype Cvi shows an increased tolerance to photo-oxidative stress and contains a new chloroplastic copper/zinc superoxide dismutase isoenzyme

Dolores Abarca1, Marta Roldán2, Mercedes Martín and Bartolomé Sabater

Departamento de Biología Vegetal, Facultad de Biología, Universidad de Alcalá, 28871-Madrid, Spain

A new chloroplastic Cu/Zn-superoxide dismutase (SOD) isoenzyme was identified in Arabidopsis thaliana ecotype Cvi. Genetic analyses indicated that the new isoenzyme was encoded by a Cvi-specific allele of Csd2 that was named Csd2-2. Paraquat treatments of A. thaliana ecotypes Ler and Cvi resulted in higher levels of chloroplastic Cu/Zn-SOD activity in Cvi, suggesting that the Cvi isoenzyme has a higher stability and/or turnover rate than the Ler variant under photo-oxidative conditions. In addition, Cvi showed a higher tolerance to paraquat treatments. Hybrid plant populations expressing Csd2-2 also exhibited an increased tolerance, suggesting that the Cvi isoenzyme is one of the factors that contribute to a better fitness in photo-oxidative stress conditions.

Key words: Arabidopsis thaliana Cvi, chloroplast, Cu/Zn-superoxide dismutase, photo-oxidative stress.


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