title: Effect of salinity stress on growth, lipid productivity, fatty acid composition, and biodiesel properties in Acutodesmus obliquus and Chlorella vulgaris.
abstract: Two microalgae strains including Chlorella vulgaris and Acutodesmus obliquus were grown on BG11 medium with salinity stress ranging from 0.06 to 0.4 M NaCl. Highest lipid content in C. vulgaris and A. obliquus was 49 and 43% in BG11 amended with 0.4 M NaCl. The microalgal strains C. vulgaris and A. obliquus grow better at 0.06 M NaCl concentration than control condition. At 0.06 M NaCl, improved dry biomass content in C. vulgaris and A. obliquus was 0.92 and 0.68 gL-1, respectively. Stress biomarkers like reactive oxygen species, antioxidant enzyme catalase, and ascorbate peroxidase were also lowest at 0.06 M NaCl concentration revealing that both the microalgal strains are well acclimatized at 0.06 M NaCl concentration. The fatty acid composition of the investigated microalgal strains was also improved by increased NaCl concentration. At 0.4 M NaCl, palmitic acid (37%), oleic acid (15.5%), and linoleic acid (20%) were the dominant fatty acids in C. vulgaris while palmitic acid (54%) and stearic acid (26.6%) were major fatty acids found in A. obliquus. Fatty acid profiling of C. vulgaris and A. obliquus significantly varied with salinity concentration. Therefore, the study showed that salt stress is an effective stress that could increase not only the lipid content but also improved the fatty acid composition which could make C. vulgaris and A. obliquus potential strains for biodiesel production.
authors.affiliation: School of Environment and Sustainable Development, Central university of Gujarat, Gandhinagar, Gujarat, India.
authors.forename: Priti Raj
authors.initials: PR
authors.lastname: Pandit
authors.affiliation: School of Environment and Sustainable Development, Central university of Gujarat, Gandhinagar, Gujarat, India. mhfulekar@yahoo.com.
authors.forename: Madhusudan H
authors.initials: MH
authors.lastname: Fulekar
authors.affiliation: Centre for Lipid Research Division, Indian Institutes of Chemical Technology, Tarnaka, Hyderabad, India.
authors.forename: Mallampalli Sri Lakshmi
authors.initials: MSL
authors.lastname: Karuna
mesh_terms: D056804:Biofuels; D018533:Biomass; D048408:Chlorella vulgaris; D005227:Fatty Acids; D058086:Microalgae; D054712:Salinity
chemical_list: D056804:Biofuels; D005227:Fatty Acids
keywords: Acutodesmus obliquus; Biomass productivity and biodiesel; Chlorella vulgaris; Fatty acid composition; Lipid; Salinity