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Plant Growth-Promoting Effects of Proteus mirabilis Isolated from Tomato (Lycopersicon esculentum Mill) Plants

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Abstract

In this study, a total of five plant-associated Proteus mirabilis were isolated from tomato (Lycopersicon esculentum Mill) plant and screened for plant growth-promoting (PGP) and antagonistic traits. The results revealed that all the isolates showed production of siderophore, and none of the isolates showed positive for hydrogen cyanide and lipase. Further, the antagonistic study of all isolates showed significant mycelial inhibition against Fusarium oxysporum. The isolate BETS2 showed best antagonistic activity against all phytopathogens tested in this study. The sequencing of 16S rRNA gene confirmed that all the isolates belong to the genus Proteus. The in vivo effect of BETS2 was demonstrated through tomato and chilli based bioassay under greenhouse conditions. The bacterial inoculation resulted in a significant increase in plant root, stem and plant biomass. The present study demonstrated that P. mirabilis could act as a plant growth-promoting bacterium.

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Acknowledgments

We thank the Director, Central Agricultural Research Institute, Port Blair, for his encouragement and help rendered to carry out this work.

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Authors and Affiliations

  1. C.G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Bardoli, Surat, Gujarat, 394350, India

    Natarajan Amaresan

  2. Crop Protection Division, ICAR-Sugarcane Breeding Institute, Coimbatore, Tamil Nadu, 641 007, India

    Velusamy Jayakumar

  3. Pandit Deendayal Upadhyay College of Horticulture & Forestry, Tirhut College Campus, Dr. Rajendra Prasad Central Agricultural University, Dholi, Muzaffarpur, Bihar, 843121, India

    Krishna Kumar

  4. Department of Microbiology, Bharathidasan University, Tiruchirapalli, Tamil Nadu, 620 024, India

    Nooruddin Thajuddin

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  1. Natarajan Amaresan
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  2. Velusamy Jayakumar
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  3. Krishna Kumar
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  4. Nooruddin Thajuddin
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Correspondence to Natarajan Amaresan.

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Significance Statement In the recent times, the enterobacteriaceae isolated from the plant parts has been reported to have plant beneficial properties. In this study, such bacteria was isolated from the tomato plants and showed plant growth promotion. This is the first report that Proteus spp. could also show plant beneficial properties.

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Amaresan, N., Jayakumar, V., Kumar, K. et al. Plant Growth-Promoting Effects of Proteus mirabilis Isolated from Tomato (Lycopersicon esculentum Mill) Plants. Natl. Acad. Sci. Lett. 44, 453–455 (2021). https://doi.org/10.1007/s40009-020-01038-3

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  • DOI: https://doi.org/10.1007/s40009-020-01038-3

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