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Plant and Cell Physiology, 1992, Vol. 33, No. 2 205-208
© 1992

Short Communication

High Concentrations of Ammonium Ions at Low pH Decrease the Number of Cyanobionts in Apical Portions of Azolla

Eiji Uheda and Shunji Kitoh

Research Institute of Advanced Science and Technology, University of Osaka Prefecture Shinke-cho, Sakai, Osaka, 593 Japan

When Azolla plants (Azolla filiculoides vax.japonica) were grown in media with high concentrations of ammonium ions at pH 3.5, numbers of cyanobionts in apical portions were very much reduced. Microscopic observations revealed that cyanobionts in these plants were preferentially damaged, with resultant death and lysis.

(Received August 2, 1991; Accepted December 27, 1991)
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