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Influence of Moderate Hyperosmotic Stress on Ultrastructure and Indicators of Energy Metabolism of Chlorella vulgaris (Chlorophyta)
Inland Water Biology ( IF 0.8 ) Pub Date : 2020-09-01 , DOI: 10.1134/s1995082920030025 A. J. Alyabev , I. N. Andreyeva , A. A. Ponomareva , V. V. Salnikov , M. A. Suslov
中文翻译:
中度高渗胁迫对寻常小球藻超微结构和能量代谢指标的影响
更新日期:2020-09-01
Inland Water Biology ( IF 0.8 ) Pub Date : 2020-09-01 , DOI: 10.1134/s1995082920030025 A. J. Alyabev , I. N. Andreyeva , A. A. Ponomareva , V. V. Salnikov , M. A. Suslov
Abstract
A comparison of the response of freshwater alga Chlorella vulgaris Beijer. on a quantitatively identical change in tonicity of growth medium by different osmotics (NaCl and sucrose) has been studied. Upon an increase in growth-medium osmotic potential (regardless the nature of osmoticum), increased thermogenesis and decreased oxygen absorption by Chlorella is observed first. The difference in the reaction of Chlorella to equiosmotic concentrations of NaCl and sucrose is revealed. Upon an increased salt background, thermogenesis and photosynthetic activity decreases in comparison with the control and the respiration rate is close to the control. In the presence of sucrose, the culture has a higher level of thermogenesis, respiration, and photosynthesis. Sodium chloride does not cause significant changes in ultrastructure of Chlorella and does not lead to significant changes in the diffusional decay of water magnetization in comparison with the control. Under sucrose stress, a change in the cell shape indicating cytorhysis is revealed. The effective water-diffusion coefficient (according to NMR data) decreases, which also indicates the reduction of cell sizes. Sucrose affects Chlorella as a nonpenetrating osmotically active substance. Under moderate hyperosmotic stress, the toxicity of NaCl is a smaller problem for freshwater microalga Chlorella than the partial dehydration caused by sucrose.中文翻译:
中度高渗胁迫对寻常小球藻超微结构和能量代谢指标的影响