ALLELOPATHIC INHIBITION EFFECT OF FOUR AQUATIC MACROPHYTES ON Microcystis aeruginosa GROWTH

作者：Shan, Ying; Wang, Zhengfang; Luo, Xingzhang; Zheng, Zheng

来源：Fresenius Environmental Bulletin, 2015, 24(11B): 4025-4033.

• Microcystis aeruginosa
• aquatic macrophytes
• allelopathic inhibition
• allelochemical identification

This work aims to identify adequate species, tissues, pretreatments and allelochemicals to inhibit algal growth. Physiological indexes were investigated to explore the mechanism underlying allelopathic effect. Results demonstrated that Microcystis aeruginosa growth could be suppressed by the four tested aquatic macrophytes, namely emergent Oenanthe javanica, Iris pseudacorus, Canna indica, and submerged Potamogeton crisp us. The leaves were responsible for releasing anti-algal inhibitors. Leaf extracts of I pseudacorus inhibited M aeruginosa by 76.60% after 11 d. Pretreatments influenced the release of inhibitors. The inhibition rate of I pseudacorus leaf extracts collected by water bath heating was 55.20% higher than that of fresh leaves. Furthermore, rare algal growth was observed after 5 d of exposure to I. pseudacorus and C. indica culture water. The allelochemicals in tissue extracts could inhibit the synthesis of chlorophyll a (Chl-a) and enhance the activity of superoxide dismutase (SOD), thus affecting algal growth. The highest removal rates of Chl-a was 78.83%. SOD activities were triggered 2 times by leaf extracts than the control. Besides, SOD activity may be impaired by the excessive algal damage. The results suggest that the major allelochemicals in I. pseudacorus culture water were identified to be aromatic compounds, including dimethyl phthalate, ethyl phthalate, phthalic acid, dibutyl phthalate, and 3-nitrophthalic acid.

• 出版日期2015
• 单位复旦大学