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Interplay between ascorbic acid and lipophilic antioxidant defences in chloroplasts of water‐stressed Arabidopsis plants
Author(s) -
Munné-Bosch Sergi,
Alegre Leonor
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)03041-7
Subject(s) - ascorbic acid , arabidopsis , chloroplast , antioxidant , botany , chemistry , photosynthesis , arabidopsis thaliana , biology , biochemistry , food science , gene , mutant
The effects of low ascorbic acid (Asc) on lipophilic antioxidant defences and lipid peroxidation in chloroplasts were evaluated in the vtc‐1 mutant of Arabidopsis thaliana , which had an Asc deficiency in chloroplasts of ca. 60%. Although low Asc did not cause oxidative stress in optimal growth conditions, it increased malondialdehyde levels in chloroplasts by ca. 60%, and reduced α‐tocopherol and β‐carotene by ca. 85% and 40%, respectively, in water‐stressed (WS) mutants. These results are indicative of the interplay between Asc and lipophilic antioxidants in chloroplasts of WS plants in vivo, and show that Asc contributes to the protection of thylakoid membrane lipids from oxidation in stressed plants.