Journal
PLANT CELL AND ENVIRONMENT
Volume 26, Issue 3, Pages 451-457Publisher
WILEY
DOI: 10.1046/j.1365-3040.2003.00976.x
Keywords
ascorbate peroxidase; catalase; 2 ',7 '-dichlorofluorescein diacetate (DCFH-DA); flow cytometry; hydrogen peroxide; paraquat; plant hormone; reactive oxygen species
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The effect of abscisic acid (ABA) on the tolerance to oxidative stress in a freshwater green alga, Chlamydomonas reinhardtii , was investigated. Exogenously added ABA enhanced the growth of this alga, which was observed under continuous illumination but not in the dark. The cells treated with ABA for 24 h showed tolerance to oxidative stress caused by exposure to paraquat or hydrogen peroxide. In the ABA-treated cells, the activities of two antioxidant enzymes, catalase (CAT) and ascorbate peroxidase (APX), were significantly higher than those in the untreated control. The result suggests that ABA plays a role in the enhancement of tolerance to oxidative stress by increasing the activity of antioxidant enzymes.
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