Effect of salinity on growth characteristics and pigment composition of two strains of dunauella viridisteodoresco: Laboratory and outdoor studies

In this study, the effect of salt concentration on growth characteristics and pigment accumulation of two strains of Dunaliella viridis Teodoresco (Ayvahk and Dalyan) which were cultured both at the laboratory and outdoor conditions were studied. The highest growth was found at 2M NaCI (1.33±0.12 d -1) for outdoor conditions. The highest cell numbers were observed at Ayvahk strain for both laboratory (8.06±0.40 xl0 6cell ml -1) and outdoor conditions (5.83±0.19 x10 6cell ml -1). The minimum cell numbers determined at 3M NaCl cultures for laboratory experiments while it was found at IM NaCl for outdoor cultures. It was measured that the cell volume of laboratory cultures (67.6±14.4 - 198.7±9.8 µm 3) were higher than outdoor cultures (48.7±9.7 - 110.5+4.9 µm 3). The total chlorophyll (a+b) and carotenoid contents were the highest at laboratory cultures for all salinity concentrations (p<0.05). The total chlorophyll and carotenoid concentration increased with salinity increase at outdoor conditions. In this study, growth rates, cell density and pigment content of two strains of D. viridis (Ayvahk and Dalyan) was determined and compared both under controlled laboratory and outdoor conditions with different salinity regimes. The results showed that the growth parameters and the pigment composition of D. viridis Ayvahk and Dalyan strains were strongly dependent on salinity. by psp