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Pathways of IAA Production from Tryptophan by Plants and by Their Epiphytic Bacteria: A Comparison
Author(s) -
Libbert Eike,
Schröuder Roswitha,
Drawert Anneliese,
Fischer Elfriede
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.tb06418.x
Subject(s) - tryptamine , bacteria , epiphyte , metabolism , biochemistry , biology , tryptophan , botany , chemistry , amino acid , genetics
Metabolites of indoleacetaldehyde (IAAld), indoleethnol (tryptophol, IAAoI), tryptamine (TNH 2 ) and indoleacetamide (IAAm) were investigated using 2 systems; a baeterial (Pea stem homogenates containing the epiphytic bacteria) and a plant system (pea stem sections under sterile conditions). In both systems, indoleacetic acid (IAA), IAAol and indolecarboxylic acid (ICA) are produced from IAAld, and IAA and ICA are produced from IAAol (production of IAAld and ICAld not investigated). In the plant system TNH 2 is converted to IAAld,IAA, IAAol and little ICA and ICAld. In the bacterial system TNH 2 is converted to IAA, IAAol, the unknown substance Xb, and many ICA and ICAld. Xb is produced from IAAm, too. A nonacidie inhibitor extract from pea stems reduces the IAA gain from IAAld, IAAol and TNH 2 , and the IAAol and IAAld gain from TNH 2 ; in the bacterial system it increases the IAAol gain from IAAld and the Xb gain from TNH 2 and IAAm. Metabolic routes connecting Try, TNH 2 and IAA are constructed for the plant tissue and for the epiphytic bacteria, respectively, including 4 sites of inhibitor action.