Metabolic and Antioxidant Responses of <i>Vallisneria asiatica</i> to Different Concentrations of Dissolved Inorganic Nitrogen and Phosphorus

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  • KANG CAIXIA
    Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University
  • HAO AIMIN
    Research Institute for East Asia Environments, Kyushu University
  • ISERI YASUSHI
    West Japan Engineering Consultants, Inc., Japan
  • KUBA TAKAHIRO
    Graduate School of Engineering, Kyushu University

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Other Title
  • 溶存態窒素およびリン濃度の違いに対するセキショウモ（<i>Vallisneria asiatica</i>）の抗酸化機能応答
  • Metabolic and Antioxidant Responses of Vallisneria asiatica to Different Concentrations of Dissolved Inorganic Nitrogen and Phosphorus

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To clarify the mechanism of submerged macrophytes disappearance and supply the necessary theory for the vegetation restoration in eutrophic Lake Taihu, effects of the moderate nutrients concentration, excessive NH4+－N and PO43－－P in the water column on the antioxidant defense system in submerged macrophyte, Vallisneria asiatica, were studied with the 20－day aquarium experiments. The results showed that the moderate concentration of nutrients can promote the metabolism of V. asiatica. Either excessive NH4+－N or PO43－－P could cause the oxidative stress to cells of V. asiatica, expressed as decreased contents of chlorophyll a (Chl.a) and protein, and the enhancement of catalase (CAT) activities in leaves of V. asiatica. In addition, 0.6 mg・l－1 of PO43－－P caused more oxidative damages to V. asiatica than 3.5 mg・l－1 NH4+－N. The results indicated that the antioxidative protection mechanisms could be activated but still could not prevent the damage of the metabolism system in V. asiatica exposed to either excessively high concentrations of NH4+－N or PO43－－P. Therefore, it is necessary to establish a dual control strategy of N and P for the restoration of V. asiatica in eutrophic Lake Taihu.

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