How Does Seagrass Cope with Eutrophication? From Stress Responses to Molecular Adaptive Mechanisms

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Songlin Liu, Yuying Huang, Hongxue Luo, Yuzheng Ren, Zhijian Jiang, Yunchao Wu, Xia Zhang, Xiaoping Huang
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引用次数: 0

Abstract

Purpose of Review

Seagrass meadows, essential yet vulnerable marine ecosystems, display complex dual responses to eutrophication. These impacts are especially concerning in seagrass meadows due to the higher frequency and intensity of eutrophication. This review was aimed at summarizing stress responses and adaptive mechanisms of seagrass from the view of eutrophication.

Recent Findings

Moderate nitrogen and phosphorus inputs initially enhance photosynthesis and biomass accumulation in nutrient-poor environments by increasing chlorophyll synthesis and photosynthetic efficiency. However, prolonged exposure leads to detrimental effects, including light attenuation from algal blooms, ammonium toxicity impairing electron transport rates, and competitive exclusion by fast-growing algae. Species-specific tolerance varies significantly: resilient seagrasses like Halodule wrightii upregulate antioxidant enzymes (e.g., superoxide dismutase and catalase) and accumulate non-enzymatic flavonoids to mitigate oxidative stress, while sensitive species such as Syringodium filiforme suffer metabolic imbalances and biomass loss. Adaptive mechanisms span multiple scales. At the molecular level, stress-responsive transcription factors (e.g., WRKY transcription factor gene and MYB proto-oncogene transcription factor gene) regulate antioxidant and carbon metabolism genes in Posidonia oceanica under nutrient excess. Physiologically, seagrasses reallocate carbon to belowground tissues under shading and suppress algal competitors via allelochemicals. Ecologically, herbivory-mediated algal control indirectly reduces oxidative stress. Despite these adaptations, chronic eutrophication degrades ecosystem services and destabilizes fishery habitats.

Summary

This review summarized the stress responses and adaptive mechanisms of seagrass under eutrophication. Future research must address climate–eutrophication synergies and leverage omics technologies to decode epigenetic resilience mechanisms. Such interdisciplinary efforts are critical to preserving seagrass meadows as blue carbon hubs and biodiversity refuges in rapidly changing coastal ecosystems.

海草如何应对富营养化?从应激反应到分子适应机制
海草草甸是重要而脆弱的海洋生态系统,对富营养化表现出复杂的双重响应。由于富营养化的频率和强度更高,这些影响在海草草甸尤其令人担忧。本文从富营养化的角度综述了海草的胁迫响应及其适应机制。最近的发现适度的氮和磷输入最初通过增加叶绿素合成和光合效率来促进营养贫乏环境下的光合作用和生物量积累。然而,长时间暴露会导致有害影响,包括藻华的光衰减,铵毒性损害电子传递速率,以及快速生长的藻类的竞争排斥。物种特异性耐受性差异显著:弹性海草如Halodule wrightii上调抗氧化酶(如超氧化物歧化酶和过氧化氢酶)并积累非酶类黄酮类物质以减轻氧化应激,而敏感海草如Syringodium filiforme则遭受代谢失衡和生物量损失。自适应机制跨越多个尺度。在分子水平上,应激反应性转录因子(如WRKY转录因子基因和MYB原癌基因转录因子基因)在营养过剩的情况下调控大洋Posidonia的抗氧化和碳代谢基因。生理上,海草通过化感化学物质将碳重新分配到遮荫下的地下组织中,抑制藻类的竞争。从生态学上讲,草食介导的藻类控制间接地减少了氧化应激。尽管有这些适应,但慢性富营养化会降低生态系统服务并破坏渔业栖息地的稳定。综述了富营养化条件下海草的胁迫响应及适应机制。未来的研究必须解决气候富营养化的协同作用,并利用组学技术来解码表观遗传恢复机制。这种跨学科的努力对于在快速变化的沿海生态系统中保护作为蓝碳中心和生物多样性避难所的海草草甸至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Current Pollution Reports
Current Pollution Reports Environmental Science-Water Science and Technology
CiteScore
12.10
自引率
1.40%
发文量
31
期刊介绍: Current Pollution Reports provides in-depth review articles contributed by international experts on the most significant developments in the field of environmental pollution.By presenting clear, insightful, balanced reviews that emphasize recently published papers of major importance, the journal elucidates current and emerging approaches to identification, characterization, treatment, management of pollutants and much more.
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