Abstract
Tomato (Lycopersicon esculentum) is important widely grown vegetable in India and its productivity is affected by bacterial wilt disease infection caused by Ralstonia solanacearum. To prevent this disease infection a study was conducted to isolate and screen effective plant growth promoting rhizobacteria (PGPR) antagonistic to R. solanacearum. A total 297 antagonistic bacteria were isolated through dual culture inoculation technique, out of which forty-two antagonistic bacteria were found positive for phlD gene by PCR amplification using two primer sets Phl2a:Phl2b and B2BF:BPR4. The genetic diversity of phlD + bacteria was studied by amplified 16S rDNA restriction analysis and demonstrated eleven groups at 65% similarity level. Out of these 42 phlD + antagonistic isolates, twenty exhibited significantly fair plant growth promoting activities like phosphate solubilization (0.92–5.33%), 25 produced indole acetic acid (1.63–7.78 μg ml−1) and few strains show production of antifungal metabolites (HCN and siderophore). The screening of PGPR (phlD +) for suppression of bacterial wilt disease in glass house conditions was showed ten isolated phlD + bacteria were able to suppress infection of bacterial wilt disease in tomato plant (var. Arka vikas) in the presence R. solanacearum. The PGPR (phlD +) isolates s188, s215 and s288 was observed to be effective plant growth promoter as it shows highest dry weight per plant (3.86, 3.85 and 3.69 g plant−1 respectively). The complete absence of wilt disease symptoms in tomato crop plants was observed by these treatments compared to negative control. Therefore inoculation of tomato plant with phlD + isolate s188 and other similar biocontrol agents may prove to be a positive strategy for checking wilt disease and thus improving plant vigor.
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Acknowledgments
We gratefully acknowledge the financial support from Indian Council of Agricultural Research (ICAR) for (project: Fl.No.16-3/2007-Hort.I (GAII-11-2/07-GAII) to conduct research work. We are also thankful to Dr A K Sood, Professor, CSKHPKV, Palampur for providing us the pathogen strain R solanacearum. We thank Dr. Rajendra Singh, supervisor of National Phytotron Facility, IARI, New Delhi for his kind suggestions and support during the research studies. We thank Dr. Annapurna and Dr. Archna Suman, Principal scientists, Division of Microbiology, IARI, New Delhi for their kind support during research studies.
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Ramadasappa, S., Rai, A.K., Jaat, R.S. et al. Isolation and screening of phlD + plant growth promoting rhizobacteria antagonistic to Ralstonia solanacearum . World J Microbiol Biotechnol 28, 1681–1690 (2012). https://doi.org/10.1007/s11274-011-0975-0
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DOI: https://doi.org/10.1007/s11274-011-0975-0