Salinity induced oxidative stress alters the physiological responses and improves the biofuel potential of green microalgae Acutodesmus dimorphus. (November 2017)

• Record Type: Journal Article
• Authors: Chokshi, Kaumeel; Pancha, Imran; Ghosh, Arup; Mishra, Sandhya
• Is Part Of: Bioresource technology. Volume 244:Part 2(2017)
• Page Start: 1376
• Page End: 1383
• Publication Date: 2017-11
• Subjects: Microalgae -- Salinity -- Oxidative stress -- Biofuel -- Lipid; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.05.003
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Salinity induced oxidative stress improved the biofuel potential of A. dimorphus. Addition of 200 mM NaCl increased the lipid and carbohydrate accumulations over 50%. Salinity stress of 200 mM for 2 days increased the biomass of A. dimorphus. Oxidative stress biomarkers were the lowest in 2 days stressed culture. 3 days of stress increased lipid accumulation by 43% without affecting the biomass. Abstract: The main aim of the present study was to analyze salinity stress induced physiological and biochemical changes in a freshwater microalgae Acutodesmus dimorphus . During single-stage cultivation, the accumulations of lipids and carbohydrates increased with an increase in an initial salinity of the culture medium. The carbohydrate and lipid accumulations of 53.30 ± 2.76% and 33.40 ± 2.29%, respectively, were observed in 200 mM NaCl added culture. During two-stage cultivation, salinity stress of 200 mM was favorable for the growth up to 2 days, as suggested by higher biomass, lower levels of oxidative stress biomarkers and no significant changes in the biochemical composition of the cells. Extending the stress to 3 days significantly increased the lipid accumulation by 43% without affecting the biomass production. This study, thus, provides the strategy to improve the biofuel potential of A. dimorphus along with presenting the physiological adaptive mechanisms of a cell against salinity stress.