Structural and metabolic responses of Ceratophyllum demersum to eutrophic conditions

  • Xiong Hanfeng
  • Tan Qiling
  • Hu Chengxiao

Abstract

Eutrophication in water bodies affects the growth of aquatic plants. In this study, we conducted static experiments to better understand the structural and metabolic responses of Ceratophyllum demersum under eutrophication conditions. The anatomical structure, nitrogen (N) and phosphorous (P) levels in tissue, malondiadehyde (MDA), and activities of three antioxidases (peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT)) of C. dermersum cultured at different nutrient levels (oligotropher, mesotropher, eutropher, and hypertrophics) were investigated. The results showed that with nutrient concentration increase, disordered anatomical structures and a cavity in stem of C. demersum existed; there was also an increase in the N and P contents of C. demersum. The MDA content improved with nutrient increase while POD and SOD activities initially increased and later decreased. CAT activity also increased during the experimental period. These finding suggested that changes in stem anatomical structure and the increase in antioxidant enzyme activity can be served as the indicators of the response of C. demersum to eutrophication conditions.

Keywords: Submerged aquatic plants, anatomical structure, antioxidant enzymes, nitrogen and phosphorus eutrophication

African Journal of Biotechnology Vol. 9(35), pp. 5722-5729, 30 August, 2010

Author Biographies

Xiong Hanfeng
Institute of Wetland Resource and Economy, Ezhou polytechnic, Ezhou, 436000, Hubei Province, China
Tan Qiling
College of Resources and Environment, Huazhong Agriculture University, Wuhan, 430070, China
Hu Chengxiao
College of Resources and Environment, Huazhong Agriculture University, Wuhan, 430070, China
Published
2013-08-18
Section
Articles

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eISSN: 1684-5315