Response of short-term heat shock on photosynthetic activity of soil crust cyanobacteria
Language English Country Austria Media print-electronic
Document type Journal Article
Grant support
RVO 67985939
Institutional long-term research development project (IBOT)
LM2015078
Czech Polar2 - Czech Polar Research Infrastructure
MŠMT- 42310/2012-640
MSMT,Government of Czech Republic and UGC, INDIA
PubMed
31359224
DOI
10.1007/s00709-019-01418-7
PII: 10.1007/s00709-019-01418-7
Knihovny.cz E-resources
- Keywords
- Cyanobacteria, Heat stress, OJIP transient, Photosynthesis,
- MeSH
- Bacterial Proteins metabolism MeSH
- Time Factors MeSH
- Chlorophyll A metabolism MeSH
- Fluorescence MeSH
- Photosynthetic Reaction Center Complex Proteins metabolism MeSH
- Photosynthesis physiology MeSH
- Quantum Theory MeSH
- Probability MeSH
- Soil Microbiology * MeSH
- Heat-Shock Response * MeSH
- Cyanobacteria physiology MeSH
- Electron Transport MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Bacterial Proteins MeSH
- Chlorophyll A MeSH
- Photosynthetic Reaction Center Complex Proteins MeSH
Short-term heat exposure in tropical regions can generate severe stress in the photosynthetic activity of soil crust cyanobacteria. We investigated the responses of two filamentous cyanobacteria, Scytonema tolypothrichoides and Tolypothrix bouteillei, to 1hr exposure at 35, 45, and 55 °C using variable chlorophyll fluorescence. Protocols for maximum quantum yield (FV/FM) and dark recovery of chlorophyll a fluorescence (OJIP) transient were applied. Heat exposure caused damage to the donor side of PSII, indicated by a decrease in FV/FM and a rapid increase in F0. After heat stress, photochemical energy utilization (φPo, φETo, and φRE1o) declined and energy dissipation (φDIo) increased. At 45 °C, the photosynthetic apparatus was reversibly damaged, since full recovery was observed after 7 days of relaxation. S. tolypothrichoides was more resistant to heat stress than T. bouteillei, confirming better adaptation to higher temperatures as observed in growth experiments.
Institute of Botany Academy of the Sciences of Czech Republic Třeboň 135 Czech Republic
School of Life Sciences University of Hyderabad Gachibowli Hyderabad 500046 India
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