Song Hanmo, Liu Yan, Gong Qingli, Gao Xu
Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao 266003, China.
Plants (Basel). 2025 May 9;14(10):1419. doi: 10.3390/plants14101419.
Marine heatwaves (MHWs) are spreading across global oceanic regions with unprecedented intensity, frequency, and duration, and are often accompanied by changes in underwater light, thereby imposing multiple stressors on coastal macroalgae. In this study, the effects of MHW intensities (moderate: +3 °C; severe: +6 °C) and light intensities (normal: 90 μmol photons m s; high: 270 μmol photons m s) on cultivated were investigated through an integrated analysis of physiological, transcriptomic, and metabolomic responses. Under moderate MHW conditions, exhibited enhanced growth and photosynthetic performance, with increased pigment content, improved electron transport, and the early activation of antioxidant defenses. Following severe MHW exposure, the partial recovery of some physiological traits was observed, while photosynthetic capacity, membrane integrity, and energy metabolism remained impaired, and oxidative damage was not fully resolved. High light stress further aggravated stress responses under both MHW intensities by disrupting photoprotection and weakening antioxidant defense systems. These results suggest that exhibits adaptive capacity under moderate MHWs and delayed physiological damage and incomplete recovery under severe MHWs. High light stress further exacerbates both responses, ultimately affecting yield and quality.
海洋热浪（MHWs）正以前所未有的强度、频率和持续时间在全球海洋区域蔓延，并且常常伴随着水下光照的变化，从而给沿海大型藻类带来多重压力。在本研究中，通过对生理、转录组和代谢组反应的综合分析，研究了海洋热浪强度（中度：+3℃；重度：+6℃）和光照强度（正常：90微摩尔光子·平方米·秒；高强度：270微摩尔光子·平方米·秒）对养殖[具体藻类名称未给出]的影响。在中度海洋热浪条件下，[具体藻类名称未给出]表现出增强的生长和光合性能，色素含量增加，电子传递改善，抗氧化防御提前激活。在遭受重度海洋热浪后，观察到一些生理特征部分恢复，而光合能力、膜完整性和能量代谢仍然受损，氧化损伤未完全消除。高光胁迫在两种海洋热浪强度下都通过破坏光保护和削弱抗氧化防御系统进一步加剧了胁迫反应。这些结果表明，[具体藻类名称未给出]在中度海洋热浪下表现出适应能力，在重度海洋热浪下生理损伤延迟且恢复不完全。高光胁迫进一步加剧了这两种反应，最终影响产量和质量。
