Hydrogen production properties of Rhodobacter capsulatus with genetically modified redox balancing pathways

► CBB pathway provides redox balancing during photoheterotrophic growth. ► Relationship between redox balancing systems and hydrogen production in R. capsulatus. ► CBB pathway of R. capsulatus strains was inactivated by deleting phosphoribulokinase. ► Total hydrogen production was increased slightly in some CBB deficient mutants.