Plant Growth Regulation

, Volume 43, Issue 1, pp 93–96

Indole-3-acetic acid production by pink-pigmented facultative methylotrophic bacteria


    • Plant Pathology and Biocontrol Unit
  • R. Tombolini
    • Plant Pathology and Biocontrol Unit
  • A. Broberg
    • Department of ChemistrySLU
  • B. Gerhardson
    • Plant Pathology and Biocontrol Unit

DOI: 10.1023/

Cite this article as:
Omer, Z., Tombolini, R., Broberg, A. et al. Plant Growth Regulation (2004) 43: 93. doi:10.1023/


In examining the presence of indole-3-acetic acid (IAA) in supernatants of pink-pigmented facultativemethylotrophic (PPFMs) bacterial cultures, three out of the 16 isolates tested showed a positive reaction ina colorimetric assay. The presence was further unambiguously con?rmed by high-performance liquidchromatography in combination with NMR. The IAA production was signi?cantly stimulated byL-tryptophan. These results prove that PPFM bacteria are able to produce the plant hormone IAA.


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© Kluwer Academic Publishers 2004