Interactions between nitrogen sources and xylose affecting growth, sporulation, and polyphenoloxidase activity in Bipolaris maydis race T

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Abstract
The effect of 23 organic and 3 inorganic N sources on growth, sporulation and polyphenoloxidase activity was measured in B. maydis race T incubated with or without a xylose supplement. Mycelial dry weight tends to be highest on acidic and other polar amino acids and least on nonpolar ones; organic N sources generally result in greater dry weight than inorganic ones. Changes in N concentration and pH of media influence growth and sporulation, but only pH alters the relative effectiveness of the N sources on these processes. The addition of xylose to the growth media has little effect on growth. However, in the presence of lysine, serine, asparagine, glycine, .gamma.-alanine, alanine and GABA, xylose causes an increase in sporulation and a concomitant decrease in polyphenoloxidase activity. There is no consistent pattern resulting from xylose addition in the presence of the other N sources.
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