Effects of Preillumination on Dark Nitrogen Fixation and Respiration by Anabaena Cylindrica |
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Authors: | Ohmori Masayuki |
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Affiliation: | Laboratory of Marine Biochemistry, Ocean Research Institute, University of Tokyo Nakano-ku, Tokyo 164, Japan |
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Abstract: | In whole filaments of Anabaena cylindrica dark nitrogen-fixingactivity (measured as acetylene reduction) and respiration increasedwith 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 increasedwith length of preillumination, but respiration declined rapidlyin the dark. At dark respiration rates below 250 nmol O2 uptake mg protein1?h1(State 1) no significant nitrogen-fixing activity is observed.From 250 to 550 nmol O2 uptake?mg protein1?h1(State 2), nitrogen-fixing activity depends on O2 uptake whileabove 550 nmol O2 uptake?mg protein1?h1 (State3), nitrogen-fixing activity no longer increases with furtherincrease in O2 uptake rate. (Received June 18, 1983; Accepted November 10, 1983) |
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