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| Content Provider | Springer Nature Link |
|---|---|
| Author | Jodłowska, S. Śliwińska, S. |
| Copyright Year | 2014 |
| Abstract | Chrococcoid cyanobacteria of the genus Synechococcus are the important component of marine and freshwater ecosystems. Picocyanobacteria comprise even 80% of total cyanobacterial biomass and contribute to 50% of total primary cyanobacterial bloom production. Chlorophyll (Chl) fluorescence and photosynthetic light response (P-I) curves are commonly used to characterize photoacclimation of Synechococcus strains. Three brackish, picocyanobacterial strains of Synechococcus (BA-132, BA-124, BA-120) were studied. They were grown under 4 irradiances [10, 55, 100, and 145 μmol(photon) m$^{−2}$ s$^{−1}$] and at 3 temperatures (15, 22.5, and 30°C). Photosynthetic rate was measured by Clark oxygen electrode, whereas the Chl fluorescence was measured using Pulse Amplitude Modulation fluorometer. Based on P-I, two mechanisms of photoacclimation were recognized in Synechococcus. The maximum value of maximum rate of photosynthesis (P $_{max}$) expressed per biomass unit at 10 μmol(photon) m$^{−2}$ s$^{−1}$ indicated a change in the number of photosynthetic units (PSU). The constant values of initial slope of photosynthetic light response curve (α) and the maximum value of P $_{max}$ expressed per Chl unit at 145 μmol(photon) m$^{−2}$ s$^{−1}$ indicated another mechanism, i.e. a change in PSU size. These two mechanisms caused changes in photosynthetic rate and its parameters (compensation point, α, saturation irradiance, dark respiration, P $_{max}$) upon the influence of different irradiance and temperature. High irradiance had a negative effect on fluorescence parameters, such as the maximum quantum yield and effective quantum yield of PSII photochemistry (φ$_{PSII}$), but it was higher in case of φ$_{PSII}$. |
| Starting Page | 223 |
| Ending Page | 232 |
| Page Count | 10 |
| File Format | |
| ISSN | 03003604 |
| Journal | Photosynthetica |
| Volume Number | 52 |
| Issue Number | 2 |
| e-ISSN | 15739058 |
| Language | English |
| Publisher | The Institute of Experimental Biology of the Czech Academy of Sciences |
| Publisher Date | 2014-04-12 |
| Publisher Place | Praha |
| Access Restriction | Subscribed |
| Subject Keyword | Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science |
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