Review of the structures and functions of algal photoreceptors to optimize bioproduct production with novel bioreactor designs for strain improvement

Abstract

Microalgae are important renewable feedstock to produce biodiesel and high‐value chemicals. Different wavelengths of light influence the growth and metabolic activities of algae. Recent research has identified the light‐sensing proteins called photoreceptors that respond to blue or red light. Structural elucidations of algal photoreceptors have gained momentum over recent years. These include channelrhodopsins, PHOT proteins, animal‐like cryptochromes, and blue‐light sensors utilizing flavin‐adenine dinucleotide proteins. Pulsing light has also been investigated as a means to optimize energy inputs into bioreactors. This study summarizes the current structural and functional basis of photoreceptor modulation to optimize the growth, production of carotenoids and other high‐value metabolites from microalgae. The review also encompasses novel photobioreactor designs that implement different light regimes including light wavelengths and time to optimize algal growth and desired metabolite profiles for high‐value products.

Enhancing the biochemical growth of Haematococcus pluvialis by mitigation of broad-spectrum light stress in wastewater cultures

“…10,11 Microalgae have emitted adaptable techniques in reaction to a strong light environment. 12 There are many statements on the combined effects of high light intensity on biomass production and biomass composition; thus, it is essential to evaluate the interactive outcome of light on the growth and biochemical composition of microalgae. 13 This study was focused on analysing the growth and metabolic level under different light intensities in H. pluvialis, which is one of the richest sources of pigments and lipids.…”