Table of Contents
Antioxidants, Volume 8, Issue 5 (May 2019) – 38 articles
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Cover Story (view full-size image) The halotolerant photoautotrophic marine microalga Dunaliella salina is one of the richest sources [...] Read more. The halotolerant photoautotrophic marine microalga Dunaliella salina is one of the richest sources of natural carotenoids, especially 9-cis β-carotene. High-intensity red light, applied under conditions of nutrient sufficiency, supported growth and enhanced the production of carotenoids, mostly β-carotene, by upregulating the entire biosynthetic pathway of carotenoids. The data support chlorophyll absorption of red light photons coupled to oxygen reduction and phytoene desaturation with a plastoquinol:oxygen oxidoreductase; partitioning of electrons between photosynthesis and carotenoid biosynthesis would depend on photon flux intensity and on the upregulation of phytoene synthase by the red light photoreceptor, phytochrome, which may also control β-carotene isomerase to increase the rate of conversion of extant all-trans β-carotene to 9-cis β-carotene. View this paper.