叶黄素
抗坏血酸
抗氧化剂
光强度
生物
超氧化物歧化酶
过氧化氢酶
紫黄质
硅藻
光防护
食品科学
生物化学
光合作用
植物
谷胱甘肽还原酶
类胡萝卜素
生物物理学
叶黄素
谷胱甘肽过氧化物酶
玉米黄质
光学
物理
作者
Arianna Smerilli,Ida Orefice,Federico Corato,Antonio Gavalás-Olea,Alexander V. Ruban,Christophe Brunet
标识
DOI:10.1111/1462-2920.13545
摘要
Photosynthesis is known to produce reactive oxygen species together with the transformation of light into biochemical energy. To fill the gap of the knowledge on the protective antioxidant network of microalgae, a series of experiments to explore the role of spectral composition and intensity of light in the modulation of the photodefence mechanisms developed by the coastal diatom Skeletonema marinoi were performed. The modulation of the total phenolic content, ascorbic acid and the enzymes glutathione reductase, catalase, ascorbate peroxidase and superoxide dismutase together with xanthophyll cycle and non-photochemical quenching in response to variations in the light environment were analysed. Most of the enzymes' activity was promptly affected by the red light. Yet, the monochromatic high intensity blue light enhanced the synthesis of total phenolic content and ascorbic acid in parallel to the xanthophyll cycle activity. This study reveals the dual effects of spectral composition and intensity of light on the modulation of photoprotective mechanisms. Diatoms developed a complementary and/or alternative tuning processes to cope with the variable light environment they experience in the water column. They also provided valuable insights into light manipulation regimes for diatom cultivation that will help to maximize production of bioactive molecules.
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