Antioxidant response of the microalga Dunaliella salina under salt stress
-
Avinash Mishra
and
Bhavanath Jha
Abstract
Hydrogen peroxide content in Dunaliella salina cells increases concomitantly with salinity, and maximum content occurred at 5.0 m NaCl concentration. Activity of the antioxidant enzyme superoxide dismutase (SOD, EC 1.15.1.1) increased significantly by two- and three-fold in 1.0 and 2.0 m salt concentrations, respectively, thereafter declining significantly. Unlike SOD, catalase (EC 1.11.1.6) activity decreased in tandem with salinity; however, there was no significant decrease in catalase activity up to 2.0 m salt concentration (compared to 0.5 m salinity). There was no significant decrease in catalase activity from 2.0 m to 5.0 m salinity, whereas a significant decrease was observed in 4.0 and 5.0 m salinity (compared to 1.0 m salinity). Ascorbic acid peroxidase (EC 1.11.1.11) activity decreased concurrently with salt stress up to 2.0 m, thereafter no significant change was observed in cells grown in varying salt concentrations (0.5–5.0 m NaCl). Detailed study of hydrogen peroxide content and antioxidant enzymes in response to varying salinity (0.5–5.0 m NaCl) has not been reported previously in Dunaliella salina. Antioxidant enzymes and H2O2 scavenging systems have short-term adaptation mechanisms for protection against salt stress and are not important in imparting salt stress tolerance to Dunaliella salina at high salinity because of production of secondary antioxidant metabolites, like β-carotene, which protect the alga against salt induced oxidative damages.
©2011 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Research Articles
- Succession patterns in algal turf vegetation on a Caribbean coral reef
- Carpospore and tetraspore release and survival in Chondracanthus squarrulosus (Rhodophyta: Gigartinaceae) from the Gulf of California
- Morphology and taxonomy of Anadyomene species (Cladophorales, Chlorophyta) from Bahia, Brazil
- Sargassum polyceratium (Phaeophyceae, Fucaceae) surface molecule activity towards fouling organisms and embryonic development of benthic species
- Colpomenia claytonii sp. nov. (Scytosiphonaceae, Phaeophyceae) based on morphology and mitochondrial cox3 sequences
- A survey of the benthic aquatic flora in transitional water systems of Greece and Cyprus (Mediterranean Sea)
- Morphological study of the genus Cocconeis Ehrenberg (Bacillariophyceae) collected during the 1897–1899 Belgian Antarctic Expedition
- Cloning differentially expressed salt induced cDNAs from Dunaliella salina under super saturated salt stress using subtractive hybridization
- Antioxidant response of the microalga Dunaliella salina under salt stress
- Temporal variation in growth and reproduction of Enhalus acoroides (L.f.) Royle in a monospecific meadow in Haad Chao Mai National Park, Trang Province, Thailand
- Lignicolous marine fungi from Yokosuka, Japan
