Cyanobacteria perform full oxygenic photosynthesis/ carbon fixation using one photosystem instead of two

https://www.eurekalert.org/news-releases/1136224

"combines genetic engineering/ adaptive laboratory evolution, producing modified strains that grow, fix CO2, generate oxygen despite completely lacking photosystem I... organisms compensated for this missing complex by reorganizing photosynthetic electron transport chain, creating steep proton gradient forcing NDH-1 complex to operate in reverse/ generate reducing agent NADPH... reshapes solar energy conversion understanding... bioengineering, highly optimized synthetic crop designs"