13 Finding the bottleneck: A research strategy for improved biomass production

Bassi, Roberto; Cardol, Pierre; Choquet, Yves; Marchin, Thomas de; Economou, Chloe; Franck, Fabrice; Goldschmidt-Clermont, Michel; Jacobi, Anna; Loizeau, Karen; Mathy, Gregory; Plancke, Charlotte; Posten, Clemens; Purton, Saul; Remacle, Claire; Vejrazka, Carsten; Wei, Lili; Wollman, Françis-André

doi:10.1515/9783110298321.227

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“…Electron transfer to O 2 (most probably Mehlertype) has been found earlier to be very effective in the green microalga Chlamydomonas reinhardtii (Sueltemeyer et al, 1986;Bassi et al, 2012). In Scenedesmus, a significant light-dependent O 2 uptake has been shown to occur (Radmer and Kok, 1976;Radmer and Ollinger, 1980;Flameling and Kromkamp, 1998) although it was not always observed (Heinze et al, 1996).…”

Section: Fluorescence and Oxygen Evolution Measurements On Dark-adaptmentioning

confidence: 91%

“…CO 2 limitation is usually associated with a reduced productivity, with the development of the carbon concentrating mechanism (Moroney et al, 2011) and with a reduced PSII antenna size (Berger et al, 2014). In labscale experiments, electron transfer to O 2 (most probably Mehler-type) has also been found to be very effective in condition of reduced CO 2 availability in Chlamydomonas reinhardtii (Sueltemeyer et al, 1986;Bassi et al, 2012) and in Scenedesmus (Radmer and Kok, 1976;Radmer and Ollinger, 1980;Flameling and Kromkamp, 1998). Among the studies on microalgae mass culture, as far as we know, none directly compared high CO 2 (CO 2 supplemented) and low CO 2 (non CO 2 supplemented) conditions.…”

Section: Introductionmentioning

confidence: 99%

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Photosynthesis of Scenedesmus obliquus in outdoor open thin-layer cascade system in high and low CO2 in Belgium

Marchin

Erpicum

Franck

2015

Journal of Biotechnology

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Two outdoor open thin-layer cascade systems operated as batch cultures with the alga Scenedesmus obliquus were used to compare the productivity and photosynthetic acclimations in control and CO 2 supplemented cultures in relation with the outdoor light irradiance. We found that the culture productivity was limited by CO 2 availability. In the CO 2 supplemented culture, we obtained a productivity of up to 24 g dw.m −2 .day −1 and found a photosynthetic efficiency (value based on the PAR solar radiation energy) of up to 5%. In the CO 2 limited culture, we obtained a productivity of up to 10 g dw.m −2 .day −1 while the photosynthetic efficiency was up to 3.3% and decreased to 2.1% when the integrated daily PAR increased. Fluorescence and oxygen evolution measurements showed that ETR and oxygen evolution light saturation curves, as well as lightdependent O 2 uptake were similar in algal samples from both cultures when the CO 2 limitation was removed. In contrast, we found that CO 2 limitation conducted to a decreased PSII photochemical efficiency and an increased light-induced heat-dissipation in the control culture compared to the CO 2 supplemented culture. These features are in line with a lower light use efficiency and may therefore contribute to the lower productivity observed in absence of CO 2 supplementation in outdoor mass cultures of Scenedesmus obliquus.

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