Aplanospore formation in a strain ofTrebouxiaisolated from the lichenCladonia cristatellawas found to be influenced by the phytochrome system. The effect of several concentrations of indoleacetic acid (IAA) and various phenolic compounds was tested, and their interaction noted. Coumarate was found to act non-competitively in inhibiting the effect of both chlorogenate and ferulate.
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