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• W1569469310 abstract "Previous work has indicated that anatomical and morphological changes (stunting and dichotomy) in roots of various conifers may be influenced by plant-growth-regulating substances secreted by mycorrhizae. Indole-3-acetic acid (IAA) has been tentatively identified as a major auxin produced by some selected ectomycorrhizae. We report the isolation and detection of IAA as a secondary metabolite from Pisolithus tinctorius by thin-layer chromatography, high-performance liquid chromatography (HPLC), enzyme-linked immunosorbent (monoclonal antibody) assay (ELISA), and unequivocal identification by gas chromatography-mass spectrometry (GC-MS). The thin-layer chromatography methods for auxin isolation described here are novel, with the use of heptane-acetone-glacial acetic acid as the migrating solvent and formaldehyde, H 2 SO 4 , and vanadate in detection. The acidic extract of the culture supernatant was methylated with ethereal diazomethane to detect IAA as methyl-3-IAA by HPLC, ELISA, and GC-MS. The quantitative amount of IAA detected ranged from 4 to 5 μmol liter −1 by HPLC and ELISA. Another unidentified metabolite was detected by GC-MS with a typical indole nucleus ( m/z = 130), indicating that it could be an intermediate in auxin metabolism. Plant response ( Pseudotsuga menziesii, Douglas fir) was monitored upon inoculation of P. tinctorius and l -tryptophan. There was a consistent increase in plant height and stem diameter as a result of the two treatments, with statistical differences in dry weights of the shoots and roots." @default.
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• W1569469310 date "1987-12-01" @default.
• W1569469310 modified "2023-10-18" @default.
• W1569469310 title "Biosynthesis of Indole-3-Acetic Acid by the Pine Ectomycorrhizal Fungus <i>Pisolithus tinctorius</i>" @default.
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• W1569469310 doi "https://doi.org/10.1128/aem.53.12.2908-2913.1987" @default.
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