Celis-Plá Paula S M, Navarrete Camilo E, Trabal Andrés, Castro-Varela Pablo A, Figueroa Félix L, Troncoso Macarena, Sáez Claudio A
Laboratory of Aquatic Environmental Research (LACER), HUB-Ambiental UPLA, University of Playa Ancha, Valparaíso 2360004, Chile.
Departamento de Ciencias y Geografía, Facultad de Ciencias Naturales y Exactas, University of Playa Ancha, Valparaíso 2360004, Chile.
Plants (Basel). 2025 Jun 12;14(12):1810. doi: 10.3390/plants14121810.
Light variability is a key environmental stressor influencing the physiology and productivity of marine macroalgae. This study examined the ecophysiological and biochemical responses of (Ochrophyta) during a natural light deprivation event caused by a solar eclipse. We measured the in vivo chlorophyll (Chl) fluorescence, photoinhibition, and photosynthetic capacity, along with the pigment content, phenolic compound accumulation, and antioxidant capacity, to evaluate short-term photosynthetic adjustments. Dark-adapted conditions during the eclipse peak led to reduced photosynthetic and biochemical activity, while post-eclipse recovery involved the increased accumulation of photosynthetic pigments and photoprotective compounds. Carotenoids showed high antioxidant potential under eclipse exposure, contrasting with declines in chlorophyll content and productivity under pre-eclipse high irradiance. This study provides valuable insights into the rapid acclimation mechanisms of to transient light stress, highlighting its sensitivity and resilience to sudden shifts in solar irradiance. These findings contribute to the broader field of marine macroalgal photobiology and stress physiology, enhancing our understanding of how intertidal brown algae adapt to dynamic environmental conditions.
光照变化是影响海洋大型藻类生理和生产力的关键环境压力源。本研究考察了在日食导致的自然光剥夺事件期间，褐藻（褐藻门）的生态生理和生化反应。我们测量了体内叶绿素（Chl）荧光、光抑制和光合能力，以及色素含量、酚类化合物积累和抗氧化能力，以评估短期光合调整。日食高峰期的暗适应条件导致光合和生化活性降低，而日食后的恢复涉及光合色素和光保护化合物积累的增加。类胡萝卜素在日食暴露下显示出高抗氧化潜力，这与日食前高辐照度下叶绿素含量和生产力的下降形成对比。本研究为褐藻对短暂光胁迫的快速适应机制提供了有价值的见解，突出了其对太阳辐照度突然变化的敏感性和恢复力。这些发现有助于海洋大型藻类光生物学和胁迫生理学这一更广泛的领域，增进我们对潮间带褐藻如何适应动态环境条件的理解。
