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<p>Light intensity affects the variation and evolution of functional traits in submerged plants, which in turn act on individual plant and ecosystem functions. A laboratory experiment was conducted to simulate the hydrological light conditions of the main distribution areas of submerged plants in PoySSSang Lake, and to explore the effects of light intensity on the functional traits and adaptive responses of the dominant submerged species <i>Hydrilla verticillata</i> (L.f.) Royle. The results are as follows: (1) The plant height, stem node growth, internode spacing length and asexual propagule growth of <i>H. verticillata</i> were inhibited under low light conditions (5% and 10% natural light); (2) Over the 30-day experimental period, the SOD activity and MDA content of <i>H. verticillata</i> in the 5%, 10%, and CK light groups reached relatively higher levels. Under 5% and 10% natural light conditions, the CAT activity of <i>H. verticillata</i> increased by 5.14 and 3.07 μmol/(g·min), respectively; (3) The membrane structure of <i>H. verticillata</i> was damaged under the conditions of 5%, 10% natural light and full-light conditions; (4) <i>H. verticillata</i> showed different growth strategies in response to different light intensities. The results guide the restoration and sustainable development of wetland aquatic ecosystems. They can be incorporated into models in the future to improve the prediction of submerged plant species distribution and area.</p>

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Effects of different light intensities on functional traits of the native submerged plant Hydrilla verticillata (Hydrocharitaceae): implication for restoring wetland vegetation

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Shanshan Luo,
  • Chenglu Chen,
  • Geying Lai,
  • Linling Tang,
  • Yun Cao

摘要

Light intensity affects the variation and evolution of functional traits in submerged plants, which in turn act on individual plant and ecosystem functions. A laboratory experiment was conducted to simulate the hydrological light conditions of the main distribution areas of submerged plants in PoySSSang Lake, and to explore the effects of light intensity on the functional traits and adaptive responses of the dominant submerged species Hydrilla verticillata (L.f.) Royle. The results are as follows: (1) The plant height, stem node growth, internode spacing length and asexual propagule growth of H. verticillata were inhibited under low light conditions (5% and 10% natural light); (2) Over the 30-day experimental period, the SOD activity and MDA content of H. verticillata in the 5%, 10%, and CK light groups reached relatively higher levels. Under 5% and 10% natural light conditions, the CAT activity of H. verticillata increased by 5.14 and 3.07 μmol/(g·min), respectively; (3) The membrane structure of H. verticillata was damaged under the conditions of 5%, 10% natural light and full-light conditions; (4) H. verticillata showed different growth strategies in response to different light intensities. The results guide the restoration and sustainable development of wetland aquatic ecosystems. They can be incorporated into models in the future to improve the prediction of submerged plant species distribution and area.