Abstract
A naturally occurring growth regulator in extracts of Marchantia polymorpha tissues has been characterized by paper chromatography and bioassay. The endogenous compound is presumed to be indoleacetic acid (IAA) on the basis of its chromatographic behavior in five solvents, its biological activity in the Avena straight-growth test, and the utilization of synthetic IAA by thallus tissues. The endogenous level of IAA in M. polymorpha thalli was estimated. The results from the sufficiently rigorous methods employed establish for the first time the presence of IAA in a bryophyte species.
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