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Abstract

ISOLATION AND CHARACTERIZATION OF BACTERIA FROM RHIZOSPHERIC SOILS OF CURCUMA LONGA FOR DIFFERENT PLANT GROWTH PROMOTION (PGPR) ACTIVITIES

*N. Meenatchi Sundaram and S. R. Murali

ABSTRACT

Plant growth promoting rhizobacteria (PGPR) are a group of bacteria that can be found in the rhizosphere, in association with roots which can enhance the growth of plant directly or indirectly. A large number of bacteria including species of Pseudomonas, Azospirillum, Azotobacter, Klebsiella, Enterobacter, Alcaligenes, Arthrobacter, Burkholderia, Bacillus, Rhizobium and Serratia have reported to enhance plant growth. In the present study, six Crcuma Longa (Turmeric) soil samples were collected from different location of Tamil Nadu (Erode, Perundurai, Salem, Nammakkal, Alnganallur, Batlagundu, Gobi). A total thirty bacteria were isolated and in-vitro screening was done for different plant growth promotion activities i.e. phosphate solublization, IAA production, ammonia production, ACC deaminase activity, and catalase. In the present work twelve bacterial isolates were positive for phosphate solublization. IAA production was shown by almost all the bacterial isolates. Three isolates were positive for ammonia production. ACC deaminase activity was shown by nine isolates. Two isolates were positive for HCN production and all the isolates were found to be catalase positive. Seven isolates were showing maximum plant growth promotion activities and further identified on the basis of colony morphology, Gram staining and biochemical tests. These isolates were identified as Acinetobacter sp., Bacillus sp., Enterobacter sp., Micrococcus sp., and Pseudomonas sp. As PGPR are environmental friendly and offer sustainable approach to increase production of crops and health. Therefore, these isolates can be utilized for biofertilizer formulation under local agro-climatic conditions of Tamil Nadu.

Keywords: Rhizobacteria, PGPR, Biofertilizers.


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