Purple non‐sulphur bacteria (PNSB) are phototrophic microorganisms, which increasingly
gain attention in plant production due to their ability to produce and accumulate high‐value
compounds that are beneficial for plant growth. Remarkable features of PNSB include the
accumulation of polyphosphate, the production of pigments and vitamins and the production
of plant growth‐promoting substances (PGPS s). Scattered case studies on the application
of PNSB for plant cultivation have been reported for decades, yet a comprehensive overview …