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Cloning and expression analysis of two different LhcSR genes involved in stress adaptation in an Antarctic microalga, Chlamydomonas sp. ICE-L.
- Source :
-
Extremophiles : life under extreme conditions [Extremophiles] 2012 Mar; Vol. 16 (2), pp. 193-203. Date of Electronic Publication: 2012 Jan 03. - Publication Year :
- 2012
-
Abstract
- Light-harvesting complexes (LHCs) play essential roles in light capture and photoprotection. Although the functional diversity of individual LHCs in many plants has been well described, knowledge regarding the extent of this family in the majority of green algal groups is still limited. In this study, two different LhcSR genes, LhcSR1 and LhcSR2 from Chlamydomonas sp. ICE-L, were cloned from the total cDNA and characterized in response to high light (HL), low light (LL), UV-B radiation and high salinity. The lower F (v)/F (m) as well as the associated induction of non-photochemical quenching (NPQ), observed under those conditions, indicated that Chlamydomonas sp. ICE-L was under stress. Under HL stress, the expression of LhcSR1 and LhcSR2 increased rapidly from 0.5 h HL and reached a maximum after 3 h. In LL, LhcSR2 expression was up-regulated during the first 0.5 h after which it decreased, while the expression of LhcSR1 decreased gradually from the beginning of the experiment. In addition, the transcript levels of LhcSR1 and LhcSR2 increased under UV-B radiation and high salinity. These results showed that both genes were inducible and up-regulated under stress conditions. A higher NPQ was accompanied by the up-regulated LhcSR genes, suggesting that LhcSR plays a role in thermal energy dissipation. Overall, the results presented here suggest that LhcSR1 and LhcSR2 play a primary role in photoprotection in Chlamydomonas sp. ICE-L under stress conditions and provide an important basis for investigation of the adaptation mechanism of LhcSR in Antarctic green algae.
- Subjects :
- Algal Proteins biosynthesis
Amino Acid Sequence
Antarctic Regions
Chlorophyll chemistry
Cloning, Molecular
Computational Biology methods
DNA Primers genetics
DNA, Complementary metabolism
Hot Temperature
Light
Light-Harvesting Protein Complexes biosynthesis
Microscopy, Fluorescence methods
Molecular Sequence Data
Photochemistry methods
Phylogeny
Sequence Homology, Amino Acid
Temperature
Time Factors
Ultraviolet Rays
Up-Regulation
Algal Proteins genetics
Chlamydomonas genetics
Chlamydomonas metabolism
Gene Expression Profiling
Gene Expression Regulation
Light-Harvesting Protein Complexes genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1433-4909
- Volume :
- 16
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Extremophiles : life under extreme conditions
- Publication Type :
- Academic Journal
- Accession number :
- 22212653
- Full Text :
- https://doi.org/10.1007/s00792-011-0419-7