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Comparative growth characterization of frequently used substrains of the model cyanobacterium Synechocystis sp. PCC 6803 under varying culture conditions
Zavřel, Tomáš ; Očenášová, Petra ; Sinětova, M. A. ; Červený, Jan
Cyanobacteria have gained increased attention as ideal candidates for biotechnological applications due to their capacity to produce valuable molecules ranging from therapeutic proteins to biofuels. Their natural phenotypic plasticity in highly dynamic environments enables easy deployment of new biotechnologies as well as opening possibilities for genetic engineering. This contribution presents a new approach to fast and reliable characterization of cyanobacteria growth in a flat panel photobioreactor that enables examination of changing light, temperature, and nutrient availability. The utilization of semi-continuous automatic cultivation with real-time culture growth monitoring provides a strong experimental basis for both characterization and optimization of cyanobacteria cultures in photobioreactors. We first characterized the autotrophic growth of the substrain of Synechocystis sp. PCC 6803 denoted as GT-L. This strain is capable of efficient growth under a wide range of environmental conditions with doubling time as fast as 5 h under favorable conditions. However, differences among Synechocystis sp. PCC 6803 substrains have been identified on both the genotype and phenotype levels. We therefore aimed to utilize the experimental platform to characterize multiple commonly used Synechocystis sp. PCC 6803 substrains. This method will enable us to identify substrains capable of robust growth and high production yields as reliable biotechnological candidates.

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