Abstract
The effects of photoperiod and a number of metabolites (inorganic nitrogenous compounds, amino acids, and growth substances) on reproductive differentiation in the leafy liverwort Cephalozia media Lindb. were studied under axenic conditions. The increase or decrease in the number of branches bearing localized reproductive structures was used to determine the influence of the experimental variables on the regulation of both asexual and sexual phases of reproductivity (production of gemmae and gametangia). Within the context of photoperiodic control, the magnitude of the normal reproductive response was significantly stimulated or inhibited by low concentrations of certain amino acids or kinetin. Certain metabolites (10‐6M concentrations of arginine, cysteine, tryptophan plus kinetin) were able to overcome photoperiodic control of the reproductive response. Generally, organic compounds which stimulated asexual reproductivity under short photoperiod inhibited sexual reproductivity under long photoperiod. Exogenous inorganic nitrogen did not significantly affect the asexual or sexual reproductive response.
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