Light Harvesting and Utilization by Phytoplankton

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In this study we use a model based on target theory to analyze steady-state photosynthesis-irradiance relationships in continuous light. From the average turnover time (τ) of photosynthetic units (PSU_<O_2>), numerical analyses of the model coefficients, and measurements of the light field and cell absorptivity, apparent absorption cross-sections of photosystem II (σ^^-_<PSII>) were determined for three species of marine unicellular algae grown at different irradiance levels. These cross-sections generally, but not always, increased with decreased growth irradiance. Additionally, the ratios of photosystem I/photosystem II reaction centers were calculated from measurements of oxygen flash yields and chlorophyll/P_<700> ratios. From the ratios of the reaction centers, cell absorptivity and the apparent absorption cross-section of photosystem II, the apparent absorption cross-sections of photosystem I (σ^^-_<PSI>) were also calculated. Finally, on the basis of our calculated absorption cross-sections, we estimated the mini-mum quantum requirements for O_2 evolution. Our results suggest that the absorption cross-sections of PS I and PS II vary independently and the minimum quantum requirements for O_2 vary by more than twofold, increasing from 9.1 to 20.6 quanta/O_2, as growth irradiance increases. The increase in quantum requirement corresponds to larger apparent cross-sections for photosystem I and higher carotenoid/chlorophyll ratios.
日本植物生理学会の論文

Light Harvesting and Utilization by Phytoplankton

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