Antioxidant system responses in two co-occurring green-tide algae under stress conditions -- Journal of Oceanology and Limnology,2016,34(1):102-108

	Cite this paper:
	WANG Ying, ZHAO Xinyu, TANG Xuexi. Antioxidant system responses in two co-occurring green-tide algae under stress conditions[J]. Journal of Oceanology and Limnology, 2016, 34(1): 102-108

Antioxidant system responses in two co-occurring green-tide algae under stress conditions

WANG Ying, ZHAO Xinyu, TANG Xuexi

Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China

Abstract:

Green tides have occurred every year from 2007 to 2014 in the Yellow Sea. Ulva prolifera (M黮ler) J. Agardh has been identifi ed as the bloom-forming alga, co-occurring with U. intestinalis. We observed distinct strategies for both algal species during green tides. U. prolifera exhibited a high abundance initially and then decreased dramatically, while U. intestinalis persisted throughout. The antioxidant system responses of these two macroalgae were compared in the late phase of a green tide (in-situ) and after laboratory acclimation. Lipid peroxidation and antioxidant system responses diff ered signifi cantly between the two. Malondialdehyde and hydrogen peroxide contents increased signifi cantly in-situ in U. prolifera, but not in U. intestinalis. In U. prolifera, we observed a signifi cant decrease in total antioxidant ability (T-AOC), antioxidant enzymes (SOD and Apx), and non-enzyme antioxidants (GSH and AsA) in-situ. U. intestinalis showed the same pattern of T-AOC and SOD, but its Gpx, Apx, and GSH responses did not diff er signifi cantly. The results suggest that U. prolifera was more susceptible than U. intestinalis to the harsh environmental changes during the late phase of a Yellow Sea green tide. The boom and bust strategy exhibited by U. prolifera and the persistence of U. intestinalis can be explained by diff erences in enzyme activity and antioxidant systems.

Key words: antioxidant system|Yellow Sea green tide|U. prolifera|U. intestinalis|algal bloom

Received: 2014-12-08 Revised: 2015-02-06

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