Martins Maria, Soares Cristiano, Figueiredo Inês, Sousa Bruno, Torres Ana Catarina, Sousa-Pinto Isabel, Veiga Puri, Rubal Marcos, Fidalgo Fernanda
GreenUPorto-Sustainable Agrifood Production Research Centre and INOV4AGRO, Biology Department, Faculty of Sciences University of Porto (FCUP), Rua do Campo Alegre, 4149-007 Porto, Portugal.
Biology Department, Faculty of Sciences University of Porto (FCUP), Rua do Campo Alegre, 4149-007 Porto, Portugal.
Plants (Basel). 2021 Sep 14;10(9):1892. doi: 10.3390/plants10091892.
During high tide, macroalgae are submersed, facing adequate environmental conditions, however, at low tide, these species can be exposed to high UV radiation and desiccation, leading to an overproduction of reactive oxygen species, causing oxidative stress. Since intertidal organisms present differential sensitivity to abiotic fluctuations, this study aimed to evaluate the physiological responses [photosynthetic pigments, hydrogen peroxide (HO), lipid peroxidation (LP), and thiols and proline] of three macroalgae, from different intertidal levels, towards tidal regimes. Samples of , , and were collected from beaches located on the southern limit of distribution in periods of potential stress (Summer and Spring), under low and high tide. The photosynthetic pigments of and were generally higher during low tide, and the oxidative damage evidenced by HO and LP increased in the Summer, while showed greater oxidative damage in the Spring. While thiol content did not change, proline levels were species- and tidal-specific among sampling dates. presented higher resilience to unfavorable conditions, while was the most sensitive species. The physiological responses analyzed were species-specific, pointing to the high susceptibility of low intertidal organisms to expected extreme climatic events.
在涨潮时，大型藻类被淹没，面临适宜的环境条件；然而，在退潮时，这些物种可能会暴露在高强度紫外线辐射和干燥环境中，导致活性氧物种过量产生，从而引发氧化应激。由于潮间带生物对非生物波动表现出不同的敏感性，本研究旨在评估来自不同潮间带水平的三种大型藻类对潮汐变化的生理反应[光合色素、过氧化氢（HO）、脂质过氧化（LP）以及硫醇和脯氨酸]。在潜在压力时期（夏季和春季）的低潮和高潮时，从分布区域南部边界的海滩采集了、和的样本。和的光合色素在低潮时通常较高，HO和LP所显示的氧化损伤在夏季增加，而在春季显示出更大的氧化损伤。虽然硫醇含量没有变化，但脯氨酸水平在不同采样日期因物种和潮汐而异。对不利条件具有更高的恢复力，而则是最敏感的物种。所分析的生理反应具有物种特异性，表明潮间带较低区域的生物对预期的极端气候事件高度敏感。
