Photoacclimation and productivity of Chlamydomonas reinhardtii grown in fluctuating light regimes which simulate outdoor algal culture conditions

Yarnold, Jennifer, Ross, Ian L. and Hankamer, Ben (2016) Photoacclimation and productivity of Chlamydomonas reinhardtii grown in fluctuating light regimes which simulate outdoor algal culture conditions. Algal Research: biology, biomass and biofuels, 13 182-194. doi:10.1016/j.algal.2015.11.001

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Author Yarnold, Jennifer
Ross, Ian L.
Hankamer, Ben
Title Photoacclimation and productivity of Chlamydomonas reinhardtii grown in fluctuating light regimes which simulate outdoor algal culture conditions
Formatted title
Photoacclimation and productivity of Chlamydomonas reinhardtii grown in fluctuating light regimes which simulate outdoor algal culture conditions
Journal name Algal Research: biology, biomass and biofuels   Check publisher's open access policy
ISSN 2211-9264
Publication date 2016-01
Sub-type Article (original research)
DOI 10.1016/j.algal.2015.11.001
Open Access Status File (Author Post-print)
Volume 13
Start page 182
End page 194
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
Outdoor microalgae systems are a promising platform for fuels and chemicals, but are currently limited by relatively low productivities. This study investigated the effects of photoacclimation on the productivity of Chlamydomonas reinhardtii grown under fluctuating light regimes which simulate well-mixed cultures in outdoor reactors. Simulations represented cells cycling between high light and dark zones in high-density (HD Fluc, light fraction (LF)=0.5) and low-density (LD Fluc, LF=0.9) cultures. Each fluctuating treatment was controlled by cultures grown under non-fluctuating light of the same hourly average irradiance (HD Avg and LD Avg) to differentiate between light dosage and regime. The large dark fraction of HD Fluc resulted in a low-light acclimated phenotype displaying up-regulation of light harvesting pigments and low NPQ caused by reduced levels of the dissipative protein LHCSR3. All other treatments led to high-light acclimation phenotypes. HD Fluc showed an estimated three-fold lower biomass yield relative to light absorbed and significant reductions in the quantum yield of PSII compared to HD Avg. This suggests that during high light periods of fluctuating cycles, higher absorption and an inability to safely dissipate excess light, resulted in greater photodamage and respiration required for repair. A framework for including these findings in predictive modelling of mass cultures is presented.
Keyword Microalgae
Chlamydomonas reinhardtii
Photoacclimation
Non-photochemical quenching
Fluctuating light
Mass culture
Lhcsr3
Photosynthesis
Predictive model
Cyclic Electron Flow
Biomass Conversion
Harvesting Protein
Energy-Dissipation
Gene-Expression
Solar-Energy
Green-Alga
Photosynthesis
Microalgae
Model
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Open Access release date January 2018

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Institute for Molecular Bioscience - Publications
 
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