Impact of green and blue ‐green light on the growth, pigment concentration, and fatty acid unsaturation in the microalga Monoraphidium braunii

In this study, the impact of white light (400 –700 nm), blue light (400–550 nm), green light (450–600 nm), and red light (580–700 nm) on the microalgaMonoraphidium braunii was investigated. The results demonstrate that light quality is an important factor for the metabolism and growth of microalgae. Specifically, the blue-green waveband (450 –550 nm) appears to be involved in the fatty acid and pigment metabolism ofM.  braunii. AbstractThe spectral composition of light is an important factor for the metabolism of photosynthetic organisms. Several blue light-regulated metabolic processes have already been identified in the industrially relevant microalgaMonoraphidium braunii. However, little is known about the spectral impact on this species' growth, fatty acid (FA), and pigment composition. In this study,M.  braunii was cultivated under different light spectra (white light: 400 –700 nm, blue light: 400–550 nm, green light: 450–600 nm, and red light: 580–700 nm) at 25°C for 96 h. The growth was monitored daily. Additionally, the FA composition, and pigment concentration was analyzed after 96 h. The highest biomass production was observed upon white ligh t and red light irradiation. However, green light also led to comparably high biomass production, fueling the scientific debate about the contribution of weakly absorbed light wavelengths to microalgal biomass production. All light spectra (white, blue, and green) that comprised blue...

Source: Photochemistry and Photobiology - October 26, 2023 Category: Science Authors: Mark Helamieh, Marco Reich, Philipp Rohne, Ulf Riebesell, Martin Kerner, Klaus K ümmerer Tags: RESEARCH ARTICLE Source Type: research