Photosynthetica 2022, 60(1):10-20 | DOI: 10.32615/ps.2021.054

Differences in susceptibility to photoinhibition do not determinegrowth rate under moderate light in batch or turbidostat - a studywith five green algae

H. MATTILA1, D. VALEV1, K.B. MISHRA2, V. HAVURINNE1, O. VIRTANEN1, M. ANTINLUOMA1, E. TYYSTJÄRVI1
1 Department of Life Technologies/Molecular Plant Biology, University of Turku, 20014 Turku, Finland
2 Global Change Research Institute of the Czech Academy of Sciences, Bìlidla 986, 4a, 603 00 Brno, Czech Republic

To understand growth limitations of photosynthetic microorganisms, and to investigate whether batch growth or certain photosynthesis-related parameters predict a turbidostat (continuous growth at constant biomass concentration) growth rate, five green algal species were grown in a photobioreactor in batch and turbidostat conditions and their susceptibilities to photoinhibition of photosystem II as well as several photosynthetic parameters were measured. Growth rates during batch and turbidostat modes varied independently of each other; thus, a growth rate measured in a batch cannot be used to determine the continuous growth rate. Greatly different photoinhibition susceptibilities in tested algae suggest that different amounts of energy were invested in repair. However, photoinhibition tolerance did not necessarily lead to a fast growth rate at a moderate light intensity. Nevertheless, we report an inverse relationship between photoinhibition tolerance and minimum saturating irradiance, suggesting that fast electron transfer capacity of PSII comes with the price of reduced photoinhibition tolerance.

Additional key words: Chlorococcum novae-angliae; Desmodesmus quadricauda; Ettlia oleoabundans; microalga; photodamage; photoinactivation; rapid light curve; Scenedesmus ecornis; Scenedesmus obliquus.

Received: June 8, 2021; Revised: October 18, 2021; Accepted: November 11, 2021; Prepublished online: December 2, 2021; Published: March 18, 2022  Show citation

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MATTILA, H., VALEV, D., MISHRA, K.B., HAVURINNE, V., VIRTANEN, O., ANTINLUOMA, M., & TYYSTJÄRVI, E. (2022). Differences in susceptibility to photoinhibition do not determinegrowth rate under moderate light in batch or turbidostat - a studywith five green algae. Photosynthetica, 60(SPECIAL ISSUE 2022), 10-20. doi: 10.32615/ps.2021.054
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