Abstract:The nitrogen-fixing activity of blue-green algae Anabaena 7120 treated by low temperature was markedly declined with increase of NaCl concentration in medium under NaCl stress. When the preincubation of the algae cells was done in dark before experiment for 24 hours or in presence of photosynthetic inhibitors, such as DNP and CCCP, a synergetic great inhibition of nitrogen-fixing activity of Anabaena treated by low temperature under NaCl stress was observed. Nitrogen-fixing activity of Anabaena influenced b...