Abstract
Summary Tryptophan synthase, indole-3-acetic acid oxidase and peroxidase activity could be detected and partly characterised in Marchantia polymorpha . Maximum activity of tryptophan synthase was achieved at pH 7.8 with a protein fraction precipitated between 0-35% ammonium sulfate. Km for L-serine was 3.2 mM. By extraction at various pH-values and by different concentrations of ammonium sulfate we achieved partial fractionation of indole-3-acetic acid oxidase (pH 6.3/35-65%(NH 4 ) 2 SO 4 ) and peroxidase (pH 7.0/35-70%(NH 4 ) 2 SO 4 ). The role of the enzymes in controlling the development of the liverwort is discussed on the basis of their different distribution in the thallus with and without gemma receptacles and the erected fertile branches (antheridiophores and archegoniophores).
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