Growth and oxidative stress response of aquatic macrophyte Myriophyllum spicatum to sediment anoxia
Growth and oxidative stress response of aquatic macrophyte Myriophyllum spicatum to sediment anoxia
复制标题
水生大型植物狐尾藻对沉积物缺氧的生长和氧化应激反应
DOI：
10.1127/fal/2018/1070
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发表时间：
2018
影响因子：
1
通讯作者：
Md H. Rashid
中科院分区：
文献类型：
--
作者：
KSS. Atapaththu;M.Parveen;T.Asaeda;Md H. Rashid
了解水生植物与环境因子之间的相互作用对水生生态系统管理具有重要意义。关于水生植物与沉积物缺氧之间的相互作用，我们所知的信息很少，而且这些植物对前一种胁迫的反应在很大程度上是未知的。在此，我们研究了底泥缺氧对肉豆蔻藻生长的影响及其生化机制。氧化还原电位(ORP)有三种状态，即。在实验室小宇宙中设置对照组(+280 mV至+350 mV)、还原(+5 mV至-30 mV)和强烈还原(-230 mV至-180 mV)，实验持续14天。在本田荒川河(日本崎玉)进行了一项田间调查，以检测在自然条件下不同ORP制度下的植物反应。在暴露于缺氧条件下的植物中，观察到植物生长减慢，伴随着叶绿素含量的显着下降。暴露在缺氧沉积物中会引起氧化应激。刺状突起，在强烈还原的环境下观察到严重的应激。我们发现抗氧化酶活性和ORP之间存在显著的正相关，在田间样品中，这种关系在植物根中比在地上部分更明显。这些结果表明，沉积物缺氧影响了藻类的生长。通过施加氧化应激和损害光合作用而产生的刺痛。因此，本研究的结果为理解缺氧环境中植物生长的机制和相应的变化提供了基础，这些信息解释了大型植物的栖息地偏好，从而有助于改进有利于生态系统管理的规划策略。
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 ofMyriophyllum spicatumas 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 inM. 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 ofM. spicatumby 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.