مرکز منطقه ای اطلاع رساني علوم و فناوري - Nitrogen Fixation Ability of Some Cyanobacteria Isolated of Maize Field (Case Study Iran).

Arabic abstract :

Nitrogen is generally considered one of the major limiting nutrients in plant growth. The biological process responsible for reduction of molecular nitrogen into ammonia is referred to as nitrogen fixation. Recently, cyanobacteria with nitrogen fixation ability were used as biofertilizer and for soil remediation. Thus, determination of their habitat, distribution and taxonomical uses would be very beneficial. The aim of the present work was a study of isolation and purification of nitrogen fixing cyanobacteria from Gorgan, Golestan province, maize fields. 20 Surface and rizosferic samples collected at 0-5 and 5-10cm depths .After isolation and purification by using BG11 media, totally 11cyanobacteria were isolated and evaluated for nitrogen fixation ability. 1 of them grow on medium without N source. All of isolate could growth on medium with insoluble phosphate. And one of the isolate indicate considerable ability to produce hydrogen cyanid. Overall results showed that cyanobacteria isolated from maize soils could be used as biofertilizer for increasing growth and yield of crops after isolation and purification. The MR7 seems to be an ideal choice for the preparation of microbial inoculant because of its ability to grow well and fix atmospheric nitrogen in the absence of combined nitrogen and soluble phosphates and produce hydrogen cyanide.