# Adaptation of Graesiella emersonii Strains to Atmospheric and Enriched CO2: Exploring Growth and Photosynthetic Efficiency

## TL;DR

This study explores how two strains of a microalga adapt to different CO2 levels, showing how each strain performs better under specific conditions.

## Contribution

The study identifies strain-specific adaptations of Graesiella emersonii to atmospheric and enriched CO2 conditions.

## Key findings

- Strain 053 performs better under atmospheric CO2 with superior photosynthetic performance.
- Strain 054 shows increased photosynthetic efficiency under elevated CO2 conditions.
- Both strains benefit from elevated CO2 with enhanced growth.

## Abstract

Graesiella emersonii, an aeroterrestrial green microalga, exhibits high adaptability to extreme environmental conditions, making it of interest for biotechnological applications. Investigating photosynthetic performance is essential to select high-yield strains and optimize the sustainable production of biomass and bio-products. In this study, two strains (053 and 054) were cultured under atmospheric (0.04%) and elevated (2%) CO2 conditions to analyze growth, pigment content, and photosynthesis. Strain 053 showed superior photosynthetic performance and productivity under atmospheric conditions, whereas 2% CO2 enhanced growth in both strains, with a significant increase in photosynthetic efficiency in strain 054. The observed differences highlight strain-specific adaptations to CO2 availability and suggest the potential of each strain depending on the cultivation environment.