Abstract
Main conclusion
Proteins involved in membrane transport and trafficking, stress and defense, iron uptake and metabolism, as well as proteolytic enzymes, were remarkably up-regulated in the salinity-tolerant strain of Chlamydomonas reinhardtii.
Excessive concentration of NaCl in the environment can cause adverse effects on plants and microalgae. Successful adaptation of plants to long-term salinity stress requires complex cellular adjustments at different levels from molecular, biochemical and physiological processes. In this study, we developed a salinity-tolerant strain (ST) of the model unicellular green alga, Chlamydomonas reinhardtii, capable of growing in medium containing 300 mM NaCl. Comparative proteomic analyses were performed to assess differential protein expression pattern between the ST and the control progenitor cells. Proteins involved in membrane transport and trafficking, stress and defense, iron uptake and metabolism, as well as protein degradation, were remarkably up-regulated in the ST cells, suggesting the importance of these processes in acclimation mechanisms to salinity stress. Moreover, 2-DE-based proteomic also revealed putative salinity-specific post-translational modifications (PTMs) on several important housekeeping proteins. Discussions were made regarding the roles of these differentially expressed proteins and the putative PTMs in cellular adaptation to long-term salinity stress.
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Acknowledgements
SS was supported by Graduate School, Kasetsart University. This work was conducted with financial support in part by the Kasetsart University Research and Development Institute Grant (Mor-Vor 9.55), Office of the Higher Education Commission and Thailand Research Fund (TRF) Grant No. MRG5580171 to CY. KY thanks TRF and Mahidol University for financial support.
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425_2017_2734_MOESM1_ESM.tif
Supplement Figure 1 Diagram showing the process of generation of salt-adapted strain of C. reinhardtii. CC-503 cells were initially grown in normal TAP medium. At the mid-logarithmic phase, cells were aliquoted into 2 fractions. One fraction was inoculated into normal TAP medium, serving as control while another was inoculated into TAP medium supplemented with 200 mM NaCl. After cells in the TAP + 200 mM NaCl started to regrown for a few generations, they were challenged with higher concentration of NaCl (250 mM). Once the cells were acclimated and able to grow for a few generations, they were challenged again with 300 mM NaCl. Cells acclimated to this 300 mM NaCl is called the “salinity-tolerant” strain or ST. It must be noted that the concentration of 300 mM NaCl was the maximum concentration that allowed consistent growth of the alga. (TIFF 8235 kb)
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Sithtisarn, S., Yokthongwattana, K., Mahong, B. et al. Comparative proteomic analysis of Chlamydomonas reinhardtii control and a salinity-tolerant strain revealed a differential protein expression pattern. Planta 246, 843–856 (2017). https://doi.org/10.1007/s00425-017-2734-4
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DOI: https://doi.org/10.1007/s00425-017-2734-4