Abstract
In photosynthetic organisms including unicellular algae, acclimation to and damage by environmental stresses are readily apparent at the level of the photosynthetic apparatus. Phenotypic manifestations of the stress responses include rapid and dramatic reduction of photosynthetic activity and pigment content aimed at mitigating the risk of photooxidative damage. Although the physiological and molecular mechanisms of these events are well known, the ultrastructural picture of the stress responses is often elusive and frequently controversial. We analyzed an extensive set of transmission electron microscopy images of the microalgal cells obtained across species of Chlorophyta and in a wide range of growth conditions. The results of the analysis allowed us to pinpoint distinct ultrastructural changes typical of normal functioning and emergency reduction of the chloroplast membrane system under high light exposure and/or mineral nutrient starvation. We demonstrate the patterns of the stress-related ultrastructural changes including peculiar thylakoid rearrangements and autophagy-like processes and provide an outlook on their significance for implementation of the stress responses.
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Abbreviations
- AMPT:
-
Appressed membrane pair thickness
- DGDG:
-
Digalactosyldiacylglycerol
- EMS:
-
Epichloroplastic membrane structures
- FAME:
-
Fatty acid methyl esters
- FID:
-
Flame ionization detector
- HLS:
-
Hub-like structures
- MGDG:
-
Monogalactosyldiacylglycerol
- NPQ:
-
Non-photochemical quenching
- OB:
-
Oil bodies
- PLB:
-
Prolamellar bodies
- PSA:
-
Photosynthetic apparatus
- RCB:
-
Rubisco-containing bodies
- S C :
-
Chloroplast area
- S P :
-
Protoplast area
- STM:
-
Stroma with thylakoid membranes of the chloroplast
- S STM :
-
Area of the STM
- TEM:
-
Transmission electron microscopy
- TLC:
-
Thin-layer chromatography
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Acknowledgements
High-pressure freezing and freeze-substitution of microalgal samples was performed in the research resource center “Molecular and cell technologies” of St. Petersburg State University.
Funding
The electron microscopy studies were carried out at the User Facilities Center of M.V. Lomonosov Moscow State University and jointly funded by the Russian Foundation for Basic Research and the Ministry of Science, Technology and Space, Israel (grant 15-54-06004). Cultivation of microalgae was supported by the Ministry of Science and Education of the Russian Federation (the Agreement number 02.a03.21.0008 of 24 June 2016).
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Gorelova, O., Baulina, O., Ismagulova, T. et al. Stress-induced changes in the ultrastructure of the photosynthetic apparatus of green microalgae. Protoplasma 256, 261–277 (2019). https://doi.org/10.1007/s00709-018-1294-1
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DOI: https://doi.org/10.1007/s00709-018-1294-1