The cells of Chlorella vulgaris exhibited NaCl (0–400 mM) induced decrease in the growth, protein, chlorophyll, carbohydrate and total organic carbon, whereas total lipid and proline content increased with rising level of NaCl. Addition of NaHCO3 (20 mM) exhibited antagonistic effect against the adverse effect of salinity on the growth, level of macromolecules except proline. The SEM–EDS analysis of NaCl treated cells exhibited morphological variations as well as reduced accumulation of Na and Cl due to the presence of NaHCO3. The results on chlorophyll fluorescence induction kinetics revealed NaCl induced decline in the photosynthetic performance and quantum yield, while non-photochemical quenching of chlorophyll was enhanced, particularly at lower concentrations of NaCl. Addition of NaHCO3 to NaCl treated cells exhibited further increase in the non-photochemical quenching values. Thus, these results demonstrated that adverse impact of NaCl on the C. vulgaris cells was significantly mitigated in the presence of bicarbonate.
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Energy dependent quenching
Photosynthetic performance index
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We would like to express our gratitude to the Head, Department of Environmental Science, B.B. Ambedkar University, Lucknow (UP), for providing required laboratory facilities. We also acknowledge the help of Director, USIC, for providing SEM-EDS facility. Ms. Nisha Yadav is also grateful to BBAU for providing non-Net UGC fellowship during the course of this work.
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Yadav, N., Gupta, N. & Singh, D.P. Ameliorating Effect of Bicarbonate on Salinity Induced Changes in the Growth, Nutrient Status, Cell Constituents and Photosynthetic Attributes of Microalga Chlorella vulgaris. Bull Environ Contam Toxicol (2021). https://doi.org/10.1007/s00128-021-03135-5
- Cell constituents
- Fast chlorophyll fluorescence induction kinetics
- Photosynthetic performance
- Salinity stress
- Sodium bicarbonate