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Plant and Cell Physiology, 1986, Vol. 27, No. 3 563-566
© 1986

Short Communication

Effect of Ammonia on Cellular pH of Anabaena cylindrica Determined with 31P NMR Spectroscopy

Masayuki Ohmori1, Tamiko Oh-hama2, Kazuo Furihata2 and Shigetoh Miyachi2

1Ocean Research Institute, University of Tokyo Minamidai 1-15-1, Nakano-ku, Tokyo 164, Japan
2Institute of Applied Microbiology, University of Tokyo Yayoi 1-1-1, Bunkyo-ku, Tokyo 113, Japan

The pH changes in the blue-green alga (cyanobacterium) Anabaena cylindrica caused by addition of ammonia were investigated using 31P NMR spectroscopy. A pH shift of 0.9 or more was observed when 30 nM NH4OH was added to the cell suspension, but no significant cellular pH change was observed with 50 mM NH4CI, a concentration high enough to stimulate dark CO2 fixation of this alga. The change in cellular pH does not seem to cause ammonia-induced stimulation of dark CO2 fixation.

(Received June 22, 1985; Accepted January 10, 1986)
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