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. 2023 Aug 12;11(8):2077. doi: 10.3390/microorganisms11082077

Figure 1.

Figure 1

The tryptophan and non-tryptophan dependent auxin biosynthesis pathways of microorganisms found in current research. Blue dashed circle: microbial cells; black solid pointed tip: known IAA microbial synthesis pathway; black dashed tip: unknown IAA microbial synthesis pathway; explosive: IAA synthetic precursor; square: IAA synthetic intermediate; hexagonal: IAA; oval shape: IAA synthesis-related enzymes; yellow: TAM pathway; blue: IPA pathway; green: TSO pathway; orange: IAM pathway; grey: IAN pathway; and purple: non-tryptophan-dependent pathway.