UTILIZATION OF LABELLED SUBSTRATES BY THE MYCELIUM AND UREDOSPORES OF FLAX RUST

Abstract

The uredospores and mycelium of flax rust have been shown to be capable of utilizing external sources of carbohydrates and amino acids in varying degrees. A rate study of the assimilation of uniformly labelled glucose indicated that a metabolic pool consisting of about 8% of the permanent cell carbon probably accounts for a large part of the exogenous respiration, but that a more complex model is required to explain the relatively high activity of the respired carbon dioxide in the early stages of the experiment. It was also found that aureomycin had little effect on the utilization of the various compounds, whereas actidione can markedly reduce respiratory activity.