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Enhanced Algal Photosynthetic Photon Efficiency by Pulsed Light
Yair Zarmi1, Jeffrey M Gordon2, Amit Mahulkar3
1Department of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 8499000, Israel.
Iscience
|May 21, 2020
Summary
Pulsed light significantly boosts algal photosynthesis photon efficiency by 3-10 times compared to continuous light. This method optimizes the photosynthetic pathway by controlling light-dark cycles for improved bioproductivity.
Area of Science:
- Biotechnology
- Photosynthesis research
- Algal cultivation
Background:
- Continuous illumination can lead to inefficiencies in algal photosynthesis.
- Optimizing light delivery is crucial for enhancing algal bioproductivity.
- Understanding photon utilization is key to improving photosynthetic efficiency.
Purpose of the Study:
- To demonstrate significant increases in photon efficiency for algal photosynthesis using pulsed light.
- To develop a model explaining the enhancement mechanism of pulsed light.
- To identify practical methods for implementing pulsed light in algal photobioreactors.
Main Methods:
- Experimental measurements of algal photosynthetic photon efficiency under pulsed vs. continuous light.
- Development of a bioproductivity model incorporating photon arrival statistics and pulsing timescales.
- Investigation of light-dark cycle optimization for algal cells.
Main Results:
- A 3-10 fold increase in photon efficiency was achieved with pulsed light at practical light intensities.
- The proposed model accurately predicts efficiency enhancements based on light pulsing parameters.
- Effective light-dark cycling prevents photosynthetic pathway "clogging".
Conclusions:
- Pulsed light offers a substantial improvement in algal photosynthetic efficiency over continuous light.
- A simple model explains how pulsed light enhances efficiency by managing photosynthetic pathway dynamics.
- Pulsed light can be practically implemented using specialized sources or turbulent mixing in dense cultures.
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