Mechanisms of Photoprotection in Cyanobacteria

Pathak, Jainendra; Ahmed, Haseen; Singh, Prashant; Singh, Shailendra P.; Häder, Donat‐P.; Sinha, Rajeshwar P.

doi:10.1016/b978-0-12-814667-5.00007-6

Cited by 35 publications

(36 citation statements)

References 258 publications

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“…Photosynthesis is not only a biochemical process achieved by photosynthetic apparatuses, it also contains a biophysical process [5,9,35]. As shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The largest amount of exciton binding energy is transferred to the photochemical reaction centres (e.g., P 680 and P 700 ), where charge separation occurs and produces electrons (e − ) and accompanied by the splitting of water into P 680 *. Other energy is transformed into fluorescence and heat [5,17,23,24,27]. Chl* conducts de-excitation by photochemistry, non-radiation heat dissipation, and chlorophyll fluorescence is then able to accept new photons, yet the process depends on the lifetime of Chl in the excited state [35,36].…”

Section: Discussionmentioning

confidence: 99%

“…However, the analytic solution of I c cannot be directly obtained by Eq. (5). To obtain I c , the Kok effect must be ignored here, and then I c can be calculated as:…”

Section: Modelmentioning

confidence: 99%

“…Irradiance acts as a driving force in photosynthesis. The level of irradiance affects the growth, CO 2 fixation efficiency, carbon metabolism, and cell composition of photosynthetic organisms [4][5][6][7][8]. High irradiance causes photoinhibition by the production of reactive oxygen species (ROS) and damages the function of the most light-sensitive complex PSII [5].…”

Section: Introductionmentioning

confidence: 99%

“…The level of irradiance affects the growth, CO 2 fixation efficiency, carbon metabolism, and cell composition of photosynthetic organisms [4][5][6][7][8]. High irradiance causes photoinhibition by the production of reactive oxygen species (ROS) and damages the function of the most light-sensitive complex PSII [5]. While extensive studies have been carried out and many insights have enriched the basis of phytoplankton physiology in recent decades [9][10][11], the relationship remains poorly understood for phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying photosynthetic performance of phytoplankton based on photosynthesis–irradiance response models

et al. 2020

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Background: Clarifying the relationship between photosynthesis and irradiance and accurately quantifying photosynthetic performance are of importance to calculate the productivity of phytoplankton, whether in aquatic ecosystems modelling or obtaining more economical production. Results:The photosynthetic performance of seven phytoplankton species was characterized by four typical photosynthesis-irradiance (P-I) response models. However, the differences were found between the returned values to photosynthetic characteristics by different P-I models. The saturation irradiance (I sat ) was distinctly underestimated by model 1, and the maximum net photosynthetic rate (P nmax ) was quite distinct from its measured values, due to the asymptotic function of the model. Models 2 and 3 lost some foundation to photosynthetic mechanisms, that the returned I sat showed significant differences with the measured data. Model 4 for higher plants could reproduce the irradiance response trends of photosynthesis well for all phytoplankton species and obtained close values to the measured data, but the fitting curves exhibited some slight deviations under the low intensity of irradiance. Different phytoplankton species showed differences in photosynthetic productivity and characteristics. Platymonas subcordiformis showed larger intrinsic quantum yield (α) and lower I sat and light compensation point (I c ) than Dunaliella salina or Isochrysis galbana. Microcystis sp., especially M. aeruginosa with the largest P nmax and α among freshwater phytoplankton strains, exhibited more efficient light use efficiency than two species of green algae. Conclusions:The present work will be useful both to describe the behavior of different phytoplankton in a quantitative way as well as to evaluate the flexibility and reusability of P-I models. Meanwhile we believe this research could provide important insight into the structure changes of phytoplankton communities in the aquatic ecosystems. Publisher's NoteSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Photosynthesis is not only a biochemical process achieved by photosynthetic apparatuses, it also contains a biophysical process [5,9,35]. As shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…However, the analytic solution of I c cannot be directly obtained by Eq. (5). To obtain I c , the Kok effect must be ignored here, and then I c can be calculated as:…”

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantifying photosynthetic performance of phytoplankton based on photosynthesis–irradiance response models

et al. 2020

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Potential Biological Activities Associated with Algal Derived Compounds

Yuan¹

2021

Recent Advances in Micro and Macroalgal Processing

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Outdoor scale‐up of Leptolyngbya sp.: Effect of light intensity and inoculum volume on photoinhibition and ‐oxidation

Schipper

Das

Muraikhi

et al. 2021

Biotech & Bioengineering

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The effect of light intensity and inoculum volume on the occurrence of photooxidation for Leptolyngbya sp. QUCCCM 56 was investigated, to facilitate the transition from small-scale laboratory experiments to large-scale outdoor cultivation. Indoor, the strain was capable of growing at light intensities of up to 5600 µmol photons/m 2 /s, at inoculation densities as low as 0.1 g/L (10% inoculation volume vol/vol). Levels of chlorophyll and phycocyanin showed a significant decrease within the first 24 h, indicating some level of photooxidation, however, both were able to recover within 72 h. When cultivated under outdoor conditions in Qatar during summer, with average peak light intensities 1981 ± 41 μmol photons/m 2 /s, the strain had difficulties growing. The culture recovered after an initial adaptation period, and clear morphological differences were observed, such as an increase in trichome length, as well as coiling of multiple trichomes in tightly packed strands. It was hypothesized that the morphological changes were induced by UV-radiation as an adaptation mechanism for increased self-shading. Furthermore, the presence of contaminating ciliates could have also affected the outdoor culture. Both UV and contaminants are generally not simulated under laboratory environments, causing a mismatch between indoor optimizations and outdoor realizations.

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Mechanisms of Photoprotection in Cyanobacteria

Cited by 35 publications

References 258 publications

Quantifying photosynthetic performance of phytoplankton based on photosynthesis–irradiance response models

Quantifying photosynthetic performance of phytoplankton based on photosynthesis–irradiance response models

Potential Biological Activities Associated with Algal Derived Compounds

Outdoor scale‐up of Leptolyngbya sp.: Effect of light intensity and inoculum volume on photoinhibition and ‐oxidation

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