%0 Journal Article
%T Characterization of nitrogen-fixing moderate halophilic cyanobacteria isolated from saline soils of Songnen Plain in China<br>
%A Wei Zhang
%A Yujie Feng
%A <br>
%J 自然科学进展
%D 2008
%I 
%X Twenty out of 200 isolates of cyanobacteria mainly from saline soils of Songnen Plain of China were successfully grown on BG11 N-free medium. The nitrogen-fixing activity was then demonstrated for the twenty isolates in modified BG11 medium using the acetylene reduction assay. All of them possessed appreciable nitrogenase activity (acetylene reduction) under non-saline conditions; however, at 5 % NaCl only 60 % of the isolates exhibited a high rate of this activity and 25 % were completely negative under these conditions. The cyanobacteria isolates grew well in BG11 medium; nevertheless, growth of the majority of isolates was reduced by about 25%-85% in the same medium containing 5% NaCl. Cellulolytic activity was detected in 50% of the twenty strains, amylolytic in 45%, and pectinolytic in 10% of the isolates. The cyanobacteria isolates showed also enzymeatic activity under saline conditions (6%). The preliminary identification indicated that seven isolates were Nostoc, two were Microcystis, four were Oscillatoria, six were Anabaena, and one isolate was Synechococcus.
%K Songnen Plain of China
%K Nitrogenase activity
%K Salt tolerance
%K Filamentous and globular cyanobacteria<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=504AF8C1E5476CA7C4EC9DF6FEAC14AC&aid=1568E0DD37F06D41E364257C6FC1D636&yid=67289AFF6305E306&vid=13553B2D12F347E8&iid=B31275AF3241DB2D&sid=CA122BD5B2FF2137&eid=1F7317C17A9AF4FA&journal_id=1002-008X&journal_name=自然科学进展&referenced_num=0&reference_num=0