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Plant and Cell Physiology, 1984, Vol. 25, No. 1 125-130
© 1984

Article

Effects of Preillumination on Dark Nitrogen Fixation and Respiration by Anabaena Cylindrica

Masayuki Ohmori

Laboratory of Marine Biochemistry, Ocean Research Institute, University of Tokyo Nakano-ku, Tokyo 164, Japan

In whole filaments of Anabaena cylindrica dark nitrogen-fixing activity (measured as acetylene reduction) and respiration increased with the light intensity of a fixed period of preillumination, saturating at ca. 10,000 lux. With saturating light during preillumination, the amount and duration of dark nitrogen-fixing activity increased with length of preillumination, but respiration declined rapidly in the dark.

At dark respiration rates below 250 nmol O2 uptake mg protein–1·h–1 (State 1) no significant nitrogen-fixing activity is observed. From 250 to 550 nmol O2 uptake·mg protein–1·h–1 (State 2), nitrogen-fixing activity depends on O2 uptake while above 550 nmol O2 uptake·mg protein–1·h–1 (State 3), nitrogen-fixing activity no longer increases with further increase in O2 uptake rate.

(Received June 18, 1983; Accepted November 10, 1983)
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