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Malic enzyme was found in both bean rust and cat stem rust uredospores. In bean rust uredospores it was shown to catalyze the formation of pyruvic acid from l-malic acid and to synthesize malic acid from pyruvic acid and CO(2). The malic enzyme from bean rust uredospores was specific for NADP and dependent on manganous ions for activity. The specific activity of the bean rust malic enzyme in crude extracts of ungerminated uredospores was approximately 6 times greater than that found in crude extracts obtained from germinated uredospores. The malic enzyme was also found in extracts obtained from healthy and rust-infected bean leaves. The specific activity of the enzyme was approximately 2 to 5 times greater in partially purified extracts obtained from the infected bean tissue at 6 days after inoculation. The specific activity of the malic enzyme in crude extracts obtained from oat stem rust uredospores was 2 times greater than the specific activity of this enzyme in crude extracts obtained from bean rust uredospores. Phosphoenolpyruvate carboxylase activity could not be demonstrated in crude extracts obtained from the ungerminated uredospores of the bean rust fungus.

Fixation of Carbon Dioxide in the Dark by the Malic Enzyme of Bean and Oat Stem Rust Uredospores