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Abstract <p>In this study, efforts were made to develop a synergistic combination of arbuscular mycorrhizal fungi (AMF) and phosphate solubilising bacteria (PSBs), which would be useful in intensive organic farming for improving the productivity and essential oil content of palmarosa (<i>Cymbopogon martini</i>) in a sustainable manner. Four species of <i>Glomus</i>, <i>viz., G. mosseae</i> (GM), <i>G. aggregatum</i> (GA), <i>G. fasciculatum</i> (GF), <i>G. intraradices</i> (GI) and two Phosphate Solubilizing Bacteria (PSBs) <i>Pseudomonas putida</i> strain MTB1 (PP) and <i>Bacillus subtilis</i> strain MTF14 (BS) were evaluated individually and in combinations in a pot experiment. Various plant growth parameters like biomass, nitrogen (N), phosphorus (P), potassium (K) uptake, mycorrhizal colonization, the bacterial population in the rhizosphere, phosphatase activity, and essential oil content were determined and found to vary with different treatments. Among all the treatments, plants inoculated with PP&#xa0;+ GM performed better than any other treatment under a glass house. The performance of the consortium of PP + GM was further validated in a field experiment on the same parameters. A clear synergistic interaction between PP and GM was observed, as PP enhanced the growth parameters and secondary metabolite content of plants by improving the colonization of GM in plant roots and increasing spore population in the soil. On the other hand, the presence of GM also improved the population of PP in the rhizosphere. The results of this experiment indicate the compatibility and synergy between PP and GM in successful colonization, survival, and function in the plant rhizosphere. It also suggests the use of this microbial consortium for the sustainable cultivation of aromatic plants.</p>

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Microbial Synergy Promotes Palmarosa Plant Development and Essential Oil Content under Organic Field Condition

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • A. Awasthi,
  • S. K. Soni,
  • I. Ahmad,
  • M. Muthukumar

摘要

Abstract

In this study, efforts were made to develop a synergistic combination of arbuscular mycorrhizal fungi (AMF) and phosphate solubilising bacteria (PSBs), which would be useful in intensive organic farming for improving the productivity and essential oil content of palmarosa (Cymbopogon martini) in a sustainable manner. Four species of Glomus, viz., G. mosseae (GM), G. aggregatum (GA), G. fasciculatum (GF), G. intraradices (GI) and two Phosphate Solubilizing Bacteria (PSBs) Pseudomonas putida strain MTB1 (PP) and Bacillus subtilis strain MTF14 (BS) were evaluated individually and in combinations in a pot experiment. Various plant growth parameters like biomass, nitrogen (N), phosphorus (P), potassium (K) uptake, mycorrhizal colonization, the bacterial population in the rhizosphere, phosphatase activity, and essential oil content were determined and found to vary with different treatments. Among all the treatments, plants inoculated with PP + GM performed better than any other treatment under a glass house. The performance of the consortium of PP + GM was further validated in a field experiment on the same parameters. A clear synergistic interaction between PP and GM was observed, as PP enhanced the growth parameters and secondary metabolite content of plants by improving the colonization of GM in plant roots and increasing spore population in the soil. On the other hand, the presence of GM also improved the population of PP in the rhizosphere. The results of this experiment indicate the compatibility and synergy between PP and GM in successful colonization, survival, and function in the plant rhizosphere. It also suggests the use of this microbial consortium for the sustainable cultivation of aromatic plants.