Abiotic stresses as tools for metabolites in microalgae

Area of Science:

• Biotechnology
• Phycology
• Metabolic Engineering

Background:

• Microalgae are increasingly recognized as sustainable sources for nutraceuticals, including pigments and omega-3 polyunsaturated fatty acids (PUFAs).
• Environmental stresses significantly influence microalgal cellular mechanisms and the accumulation of stress metabolites.
• Current challenges include inadequate biomass generation, hindering the economic viability of microalgal-based production.

Purpose of the Study:

• To review cellular-level changes in microalgae under various stress conditions.
• To explore the impact of stress on the biosynthesis of lipids (including omega-3 PUFAs), pigments, and polymers.
• To provide insights into optimizing microalgal metabolism for enhanced nutraceutical production.

Main Methods:

• Literature review focusing on stress responses in microalgae and cyanobacteria.
• Analysis of metabolic pathway alterations under abiotic stresses (temperature, salinity, UV radiation, nutrient deprivation).
• Examination of stress-induced regulation of carotenoids in green algae and phycobiliproteins in cyanobacteria.

Main Results:

• Environmental stresses trigger significant changes in microalgal metabolic pathways.
• Stress responses lead to the accumulation of specific metabolites, impacting lipid, pigment, and polymer content.
• Different stresses differentially affect the biosynthesis of key compounds like carotenoids and phycobiliproteins.

Conclusions:

• Cellular stress responses in microalgae are complex and directly influence the production of valuable compounds.
• Further research into stress metabolism is crucial for overcoming biomass limitations and enhancing nutraceutical yields.
• Optimizing stress conditions presents a viable strategy for improving the economic feasibility of microalgal biotechnology.