Celis-Plá Paula S M, Bouzon Zenilda L, Hall-Spencer Jason M, Schmidt Eder C, Korbee Nathalie, Figueroa Félix L
Departamento de Ecología, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain; Laboratorio de Botánica, Facultad de Farmacia, Universidad de Barcelona, Joan XXIII s/n, 08028 Barcelona, Spain.
Plant Cell Biology Laboratory, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, 88049-900, CP 476 Florianópolis, SC, Brazil.
Mar Environ Res. 2016 Apr;115:89-97. doi: 10.1016/j.marenvres.2015.11.014. Epub 2015 Dec 2.
Seasonal changes in the biochemistry and photophysiology of the brown macroalga Cystoseira tamariscifolia was analyzed in southern Spain. Total carbon and nitrogen contents, phenolic compounds, antioxidant and photosynthetic activities were seasonally determined over two years. Carbon, nitrogen and photoprotective phenolic contents were higher in winter and spring than in summer and autumn. Antioxidant levels were highest in spring and we found a positive correlation between phenolic content and antioxidant activity (EC50). Photosynthetic capacity (ETRmax) and photosynthetic efficiency (αETR) were also highest in spring, and there was a positive correlation between ETRmax and the amount of phenols present. Increased irradiance in spring enhanced algal productivity, antioxidant activity and the production of photoprotective compounds but in summer nutrient depletion due to thermal stratification of coastal waters reduced photosynthetic activity and the photoprotective capacity of C. tamariscifolia. Electron microscopy showed that phenols occurred in the cytoplasm of cortical cells inside physodes. Spring would be the best period to harvest C. tamariscifolia to extract photoprotectors and antioxidants for potential commercial uses, although the environmental impacts would need to be carefully assessed.
在西班牙南部分析了褐藻（Cystoseira tamariscifolia）生物化学和光生理学的季节性变化。在两年时间里，对总碳和氮含量、酚类化合物、抗氧化和光合活性进行了季节性测定。冬季和春季的碳、氮和光保护酚含量高于夏季和秋季。抗氧化水平在春季最高，并且我们发现酚含量与抗氧化活性（EC50）之间存在正相关。光合能力（ETRmax）和光合效率（αETR）在春季也最高，并且ETRmax与酚类物质含量之间存在正相关。春季光照增强提高了藻类生产力、抗氧化活性和光保护化合物的产生，但在夏季，由于沿海水域的热分层导致营养物质耗尽，降低了C. tamariscifolia的光合活性和光保护能力。电子显微镜显示酚类物质存在于液泡内皮层细胞的细胞质中。春季将是收获C. tamariscifolia以提取光保护剂和抗氧化剂用于潜在商业用途的最佳时期，尽管需要仔细评估其对环境的影响。
