Journal
LIFE-BASEL
Volume 13, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/life13020313
Keywords
light-salt stress; microalgae; Dunaliella salina; Cylindrotheca closterium; Phormidium versicolor; PSII; photosynthetic activity; antioxidative enzyme activity
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The growth of Dunaliella salina and Phormidium versicolor was inhibited by high salinity, while Cylindrotheca closterium was strongly affected. The photosynthetic and antioxidant enzyme activities varied among the species under different light levels and salinity concentrations. P. versicolor and C. closterium strains could be potential sources of extremolytes under high temperature and high salinity conditions.
Dunaliella salina (Chlorophyceae), Phormidium versicolor (Cyanophyceae), and Cylindrotheca closterium (Bacillariophyceae) were isolated from three ponds in the solar saltern of Sfax (Tunisia). Growth, pigment contents, and photosynthetic and antioxidant enzyme activities were measured under controlled conditions of three light levels (300, 500, and 1000 mu mol photons m(-2) s(-1)) and three NaCl concentrations (40, 80, and 140 g L-1). The highest salinity reduced the growth of D. salina and P. versicolor NCC466 and strongly inhibited that of C. closterium. According to phi PSII values, the photosynthetic apparatus of P. versicolor was stimulated by increasing salinity, whereas that of D. salina and C. closterium was decreased by irradiance rise. The production of carotenoids in D. salina and P. versicolor was stimulated when salinity and irradiance increased, whereas it decreased in the diatom. Catalase (CAT), Superoxide dismutase (SOD), and Ascorbate peroxidase (APX) activities were only detected when the three species were cultivated under E1000. The antioxidant activity of carotenoids could compensate for the low antioxidant enzyme activity measured in D. salina. Salinity and irradiation levels interact with the physiology of three species that have mechanisms of more or less effective stress resistance, hence different resistance to environmental stresses according to the species. Under these stress-controlled conditions, P. versicolor and C. closterium strains could provide promising sources of extremolyte for several purposes.
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