Plant growth-promoting traits of biocontrol potential bacteria isolated from rice rhizosphere

Gopalakrishnan, S and Upadhyaya, H D and Vadlamudi, S and Humayun, P and Vidya, M. S. and Alekhya, G and Singh, A and Vijayabharathi, R and Bhimineni, R K and Seema, M and Rathore, A and Rupela, Om (2012) Plant growth-promoting traits of biocontrol potential bacteria isolated from rice rhizosphere. SpringerPlus, 102 (17). pp. 1-13.

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Seven isolates of bacteria (SRI-156, SRI-158, SRI-178, SRI-211, SRI-229, SRI-305 and SRI-360) were earlier reported by us as having potential for biocontrol of charcoal rot of sorghum and plant growth promotion (PGP) of the plant. In the present study, the seven isolates were characterized for their physiological traits (tolerance to salinity, pH, temperature and resistance to antibiotics and fungicides) and further evaluated in the field for their PGP of rice. All the seven isolates were able to grow at pH values between 5 and 13, in NaCl concentrations of up to 8% (except SRI-156 and SRI-360), temperatures between 20 and 40?C and were resistant to ampicillin (>100 ppm; except SRI-158 and SRI-178) but sensitive (<10 ppm) to chloramphenicol, kanamycin, nalidixic acid, streptomycin (except SRI-156 and SRI-211) and tetracycline. They were tolerant to fungicides benlate and captan, except SRI-158 and SRI-178, bavistin and sensitive to thiram (except SRI-156 and SRI-211) at field application level. In the field, four of the seven isolates (SRI-158, SRI-211, SRI-229 and SRI-360) significantly enhanced the tiller numbers, stover and grain yields, total dry matter, root length, volume and dry weight over the un-inoculated control. In the rhizosphere soil at harvest, all the isolates significantly enhanced microbial biomass carbon (except SRI-156), microbial biomass nitrogen and dehydrogenase activity (up to 33%, 36% and 39%, respectively) and total N, available P and% organic carbon (up to 10%, 38% and 10%, respectively) compared to the control. This investigation further confirms that the SRI isolates have PGP properties.

Item Type: Article
Subjects: Others > Genetics and Genomics
Others > Agriculture-Farming, Production, Technology, Economics
Others > Entomology
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 31 Jan 2013 11:23
Last Modified: 31 Jan 2013 11:23
Official URL:
Funders: Government of India - Department of Science and Technology
Acknowledgement: We thank the Department of Biotechnology, Ministry of Science and Technology, Government of India and the National Bureau of Agriculturally Important Microorganisms for providing financial support. We also thank all the staff of the Biocontrol Unit of ICRISAT including M/s PVS Prasad, P Manohar, B Nagappa, D Barath, A Jabbar and S Rohini for their significant inputs in the laboratory and field studies.
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