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Pathways of IAA Production from Tryptophan by Plants and by Their Epiphytic Bacteria: A Comparison
Author(s) -
Libbert Eike,
Fischer Elfriede,
Drawert Anneliese,
Schröuder Roswitha
Publication year - 1970
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1970.tb06417.x
Subject(s) - tryptamine , bacteria , tryptophan , epiphyte , biochemistry , chemistry , biology , botany , biosynthesis , amino acid , enzyme , genetics
Metabolites of tryptophan were investigated using 2 systems: a bacterial (Peastem homogenates containing the epiphytic bacteria) and a plant system (pea stem sections under sterile conditions). The plant system produces: indolepyruvic acid (IPyA), indoleacetaldehyde (IAAld) indoleacetic acid (IAA), indoleethanol (tryptophol, IAAol), indolecarboxylie acid (ICA), indolecarboxaldehyde (ICAld). Bacteria produce additionally: indoleactic acid (ILA), tryptamine (TNH 2 ) and the unknown Xb and Yb, but IAAld was not detected. A nonacidic inhibitor extract from pea stems decreases the gain of IAA, IPyA, ILA, Yb. It increases the gain of IAAld, IAAol, TNH 2 , Xb, and (only in the bacterial system) ICA and ICAld. Three sites of inhibitor action are suggested, namely the steps Try → IPyA, TNH 2 → IAAld, IAAld → IAA.