summary: The haem requirement for growth of the rumen chytridiomycete H8 was satisfied by haem, haemin, haematin, mesoporphyrin IX, coproporphyrins I and III, uroporphyrins I and III, but not deuteroporphyrin IX. Porphyrin degradation products and precursors of porphyrin synthesis did not support growth. Protoporphyrin IX and haemato-porphyrin IX supported growth, indicating that the organism contains ferrochetalase, but was unable to synthesize the porphyrin ring. Haem could be provided by catalase and peroxidase, but not by cytochrome . Zoosporogenesis was induced in H8 in rumen fluid principally by haem, haemin and haematin, and to a smaller extent by catalase, peroxidase and protoporphyrin IX. Haem precursors and degradation products were ineffective. Chlorophylls and and their ruminai degradation products, plant fraction 1 protein and chelated iron neither stimulated growth nor induced zoosporogenesis. Haem induced partial zoosporogenesis in haem-limited cultures and suspensions of sporangia grown .


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