增强珊瑚光合作用：海藻酸锰凝胶的力量

IF 3.6 3区医学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY

Journal of Trace Elements in Medicine and Biology Pub Date : 2025-05-24 DOI:10.1016/j.jtemb.2025.127675

Gabriel Rodrigues Martins Moreira , João Manoel De Lima Júnior , Cassiana Seimi Nomura , Jany Hellen Ferreira De Jesus , Emmanuelle Uher , Aurélie Dufour , Maria-Isabelle Marcus Do Noscimiento , Renaud Grover , Christophe Migon , Christine Ferrier-Pagès , Breno Pannia Espósito

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引用次数: 0

摘要

硬核珊瑚依靠与共生藻科（一种海洋鞭毛藻）的共生关系，产生光合产物，维持它们在营养贫乏的环境中生长。锰（Mn）是光合作用的关键元素，是光合作用机制中氧气进化复合体的重要辅助因子。此外，锰是一种必需的金属，参与抗氧化机制，维持热应激珊瑚的正常细胞功能。目的：研究热胁迫下不同锰种类对雌蕊柱头珊瑚光合效率的影响。为此研制了一种海藻酸锰控制补锰装置。方法：珊瑚棒暴露于以下Mn物种：锰（II）氯化锰（MnCl₂），锰（II）乙二胺-N，N ' -二磺酸（MnEDDS），锰（II）去铁胺（MnDFO）和锰（III）柠檬酸盐（MnCIT）。采用荧光法测定光合参数。制备海藻酸锰凝胶培养皿进行控释，并在26°C和31°C条件下评估其对珊瑚健康指标的影响，包括光合效率、产氧量和共生密度。结果：游离Mn(II) （MnCl2）和MnEDDS显著提高了光合效率。海藻酸锰有效地以可控的爆发方式输送锰。在热胁迫下，补锰提高了光合活性，有利于共生体密度。锰藻酸盐培养皿在海水中稳定，具有生物相容性，在高温下释放锰的效果最佳。结论：锰藻酸盐凝胶培养皿是一种有效、安全的方法，可以提高珊瑚的光合作用，减轻热胁迫影响，支持气候变化下的珊瑚礁保护工作。

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Enhancing coral photosynthesis: The power of manganese-alginate gels

Introduction

Scleractinian corals rely on symbiosis with Symbiodiniaceae, a family of marine dinoflagellates, for photosynthetic products, which sustains their growth in nutrient-poor environments. Manganese (Mn) is a critical element for photosynthesis as an essential cofactor for the oxygen-evolving complex of the photosynthetic machinery. Also, Mn is an essential metal involved in antioxidant mechanisms that maintain normal cellular function in heat stressed corals. Objectives: This study aims to investigate the effects of different Mn species on photosynthetic efficiency in the coral Stylophora pistillata under thermal stress. A Mn-alginate device for controlled Mn supplementation was developed for this purpose. Methods: Coral nubbins were exposed to the following Mn species: manganese(II) chloride (MnCl₂), manganese(II) ethylenediamine-N,N′-disuccinate (MnEDDS), manganese(II) desferrioxamine (MnDFO), and manganese(III) citrate (MnCIT). Photosynthetic parameters were measured using fluorometry. Mn-alginate gel dishes were prepared for controlled release, and their impacts on coral health indicators were evaluated at 26 °C and 31 °C, including photosynthetic efficiency, oxygen production, and symbiont density. Results: Free Mn(II) (MnCl₂) and MnEDDS significantly enhanced photosynthetic efficiency. Mn-alginate effectively delivered Mn in controlled bursts. Under thermal stress, Mn supplementation improved photosynthetic activity and favored symbiont density. Mn-alginate dishes were stable in seawater and biocompatible, releasing Mn optimally at elevated temperatures. Conclusion: Mn-alginate gel dishes are an efficient and safe method for improving coral photosynthesis and mitigating thermal stress impacts, supporting reef conservation efforts in a changing climate.

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来源期刊

Journal of Trace Elements in Medicine and Biology 医学-内分泌学与代谢

CiteScore

6.60

自引率

2.90%

发文量

202

审稿时长

85 days

期刊介绍： The journal provides the reader with a thorough description of theoretical and applied aspects of trace elements in medicine and biology and is devoted to the advancement of scientific knowledge about trace elements and trace element species. Trace elements play essential roles in the maintenance of physiological processes. During the last decades there has been a great deal of scientific investigation about the function and binding of trace elements. The Journal of Trace Elements in Medicine and Biology focuses on the description and dissemination of scientific results concerning the role of trace elements with respect to their mode of action in health and disease and nutritional importance. Progress in the knowledge of the biological role of trace elements depends, however, on advances in trace elements chemistry. Thus the Journal of Trace Elements in Medicine and Biology will include only those papers that base their results on proven analytical methods. Also, we only publish those articles in which the quality assurance regarding the execution of experiments and achievement of results is guaranteed.