Ajay Kumar, Hariom Verma, Akhilesh Yadav, Waquar Akhtar Ansari, Prem Pratap Singh, Sandeep Kumar Singh, P.K. Singh and K.D. Pandey*

Centre of Advance study in Botany, Banaras Hindu University, Varanasi – 221 005, India.

Abstract

In this study,31 bacterial strains were isolated from the rhizospheric soil of Curcuma amada (mango ginger) and theirplant growth promotion potential, salinity tolerance, antibiotic sensitivity, antimicrobial propertieswere evaluated. Eight bacterial strains namely AzotobacterchroococcumKCA1, PseudomonasfluorescensKCA2, Bacillus subtilisKCA3, Bacillus sp. KCA4, Agrobacterium tumifaciensKCA5, Bacillus cereusKCL7,Pseudomonas putidaKCA8 andPaenibacillus sp. KCA9 have been identified on the basis of biochemicals and 16S rRNA gene sequence analysis. All the strains solubilized tri-calcium phosphate and produced IAA, ammonia but only 50% of the strains produced siderophores during PGP traits analysis.Strains KCA8 tolerated maximum NaCl(7%) relative to strain KCA5 (1-2%). The strains were sensitive to the antibiotic chloromphenicol followed by erythromycin and most of these effectively inhibited growth of Escherichia coli, Fusarium solaniand Alterneriaalternata during antimicrobial properties.

Keywords: Curcuma amada,PGPR, PGP traits, Antimicrobial properties, Salinity tolerance.