Identification and combinatorial engineering of indole-3-acetic acid synthetic pathways in Paenibacillus polymyxa.

Background: Paenibacillus polymyxa is a typical plant growth-promoting rhizobacterium (PGPR), and synthesis of indole-3-acetic acid (IAA) is one of the reasons for its growth-promoting capacity. The synthetic pathways of IAA in P. polymyxa must be identified and modified.