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Plant and Cell Physiology, 1970, Vol. 11, No. 2 231-239
© 1970

Article

Effects of growth conditions on formation of cytochrome system of a denitrifying bacterium, Pseudomonas stutzeri

TAKAO KODAMA1

Biological Institute, Faculty of Science, Nagoya University Nagoya, Japan

Cytochrome systems in cells of a denitrifying bacterium, Pseudomonas stutzeri (VAN NIEL strain), grown under different atmospheric conditions were compared with reference to the effects of nitrate and nitrite on cytochrome synthesis.

When a culture was sufficiently aerated (aerobic conditions), synthesis of all cytochrome components was repressed, regardless of the presence or absence of nitrate and nitrite. When aerated moderately (semi-aerobic conditions), both soluble and paniculate cytochromes c-552 and cytochrome b-558 contents markedly increased even in the absence of nitrate and nitrite.

Under anaerobic or semi-aerobic conditions, nitrite induced cytochrome a2–c synthesis. This inductive effect of nitrite was counteracted by nitrate. Nitrate also repressed particulate cytochrome c-552 synthesis to some extent but nitrite did not.

1Present address: Department of Biochemistry, Hiroshima University School of Dentistry, Hiroshima, Japan

(Received June 24, 1969; )
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