ISOLATION OF AZOTOBACTER FROM DROUGHT PRONE AREA AND STUDY ON ITS PLANT GROWTH PROMOTING ACTIVITIES
Pawar J. S.*, Khambe S. D. and Jadhav J. P.
ABSTRACT
As global warming is increasing, the world is facing the problem of water scarcity. This affects the crop yield. Large area of India is under drought condition so giving low crop yield. Crop yields are more dependent on adequate water supply than any other single environmental factors. The plants found in arid and semiarid area require low water for their growth. Some drought resistant microorganisms may yet established in such region. Isolation of such microorganisms, its mass production and inoculation in drought region may definitely help to increase the crop yield. Such microorganisms may produce plant growth promoting compounds near rhizosphere, which help for growth of plant and crop yield. Plant growth promoting properties of these organisms, like, Nitrogen fixation, production of IAA, gibberline, cytokinins, exopolysaccharide, phosphate solubilization, nitrogen fixation, production of siderophore and antifungal compounds can be studied. Present study is for isolation of free living Azotobacter from drought prone area of Dist. Sangli (MH), and its plant growth promoting activities, phosphate solubilization, IAA production and its media optimization. Isolates obtained show increasing IAA production at pH 9 in presence of arabinose and at tryptophan conc. 400µg/ml.
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