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Growth and oxidative stress response of aquatic macrophyte Myriophyllum spicatum to sediment anoxia

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Understanding the interaction between aquatic plants and environmental factors is important for aquatic ecosystem management. Information on the interaction between aquatic plants and sediment anoxia is scarce to our knowledge, and the responses of these plants against the former stress are largely unknown. Here, we investigated the biochemical mechanisms of growth impairment of Myriophyllum spicatum as affected by sediment anoxia. Three regimes of oxidative redox potentials (ORP), viz. control (+280 mV to +350 mV), reduced (+5 mV to –30 mV) and strongly reduced (–230 mV to –180 mV) were set in laboratory microcosms, and the experiment lasted for 14 days. A field investigation was carried out at the Moto-Arakawa River (Saitama, Japan) to detect plant responses at different ORP regimes in natural conditions. A decrease in plant growth coupled with a significant reduction in chlorophyll content was observed in plants exposed to anoxic conditions. Exposure to anoxic sediments induces an oxidative stress in M. spicatum, where a severe stress was observed under a strongly reduced environment. We detected significant positive correlations between antioxidant enzyme activities and ORP, where this relationship is more noticeable for plant roots than shoots in field samples. These results suggest that sediment anoxia affects the growth of M. spicatum by exerting oxidative stress and impairing photosynthesis. Therefore, the results of this study provide a basis for understanding the mechanism and consequential changes in plant growth in anoxic environments, with such information explaining the habitat preferences of macrophytes, thus contributing to improved planning strategies beneficial for ecosystem management.
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Keywords: ABIOTIC STRESS; ANTIOXIDATIVE ENZYMES; PHOTOSYNTHESIS; REACTIVE OXYGEN SPECIES; REDOX-POTENTIAL

Document Type: Research Article

Publication date: September 1, 2018

This article was made available online on July 13, 2018 as a Fast Track article with title: "Growth and oxidative stress response of aquatic macrophyte Myriophyllum spicatum to sediment anoxia".

More about this publication?
  • Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.

    Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.

    Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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