L'acide indolyl-3-lactique et son métabolisme chez Rhizobium |
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Authors: | Jean Rigaud |
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Institution: | (1) Faculté des Sciences, Laboratoire de Biologie végétale, Nice, France;(2) Laboratoire de Physiologie végétale, Université de Nice, 28, Avenue Valrose, F-06 Nice |
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Abstract: | Summary Among the indole compounds formed when tryptophan 2-14C is metabolized by Rhizobium, indole-3-lactic acid (ILA) is specially studied. In the course of experiments carried out in the culture medium of growing Rhizobium and in suspensions of washed bacterial cells the amount of ILA formed is compared with that of indole-3-acetic acid (IAA) occurring simulataneously. The formation of ILA and that of IAA directly depend on a transamination reaction. A large quantity of ILA is present in suspensions of washed bacterial cells.When ILA alone, as precursor, is incubated with Rhizobium, several products are identified: IAA, indole-3-acetaldehyde and tryptophol. Tryptophan is also detected in the aqueous fraction and is labelled when ILA 2-14C is used. The pathway of this metabolism are discussed and a general scheme is suggested. |
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