Light dependent accumulation of β-carotene enhances photo-acclimation of Euglena gracilis.

Journal of Photochemistry and Photobiology. B, Biology
Yuri TannoTomoko Shinomura

Abstract

Carotenoids are essential components of photosynthetic organisms including land plants, algae, cyanobacteria, and photosynthetic bacteria. Although the light-mediated regulation of carotenoid biosynthesis, including the light/dark cycle as well as the dependence of carotenoid biosynthesis-related gene translation on light wavelength, has been investigated in land plants, these aspects have not been studied in microalgae. Here, we investigated carotenoid biosynthesis in Euglena gracilis and found that zeaxanthin accumulates in the dark. The major carotenoid species in E. gracilis, namely β-carotene, neoxanthin, diadinoxanthin and diatoxanthin, accumulated corresponding to the duration of light irradiation under the light/dark cycle, although the translation of carotenoid biosynthesis genes hardly changed. Irradiation with either blue or red-light (3 μmol photons m-2 s-1) caused a 1.3-fold increase in β-carotene content compared with the dark control. Blue-light irradiation (300 μmol photons m-2 s-1) caused an increase in the cellular content of both zeaxanthin and all trans-diatoxanthin, and this increase was proportional to blue-light intensity. In addition, pre-irradiation with blue-light of 3 or 30 μmol photons m-2 s-1 enhanc...Continue Reading

Citations

Apr 4, 2021·Marine Drugs·Antia G PereiraMiguel A Prieto
Aug 7, 2021·Frontiers in Bioengineering and Biotechnology·Jiayi HeJiangxin Wang
Aug 14, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Juan S ArcilaGermán Buitrón

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