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  • Title: Isolation of a novel rhizobacteria having multiple plant growth promoting traits and antifungal activity against certain phytopathogens.
    Author: Goswami M, Deka S.
    Journal: Microbiol Res; 2020 Nov; 240():126516. PubMed ID: 32622988.
    Abstract:
    The present study was conducted to explore the potentialities of a versatile multifarious plant growth promoting rhizobacteria Bacillus altitudinis MS16 (GenBank Accession no. MG066459) and its effectiveness in phytopathogen inhibition. B.altitudinis MS16 was evaluated in vitro and it was found to fix 82.80 ± 0.6 μg N ml-1 of culture media, can produce 40.74 ± 0.7 μg ml-1 of IAA, release 7.72 ± 0.9 μg ml-1 of insoluble phosphorus and can secrete hydrolytic enzymes. Apart from potassium and zinc solubilization, it exhibited robust motility and biofilm forming abilities. The strain exhibits remarkable root colonizing efficiency and act strongly against phytopathogens like Colletotrichum gloeosporioides, Sclerotinia sclerotiorum, Corynespora cassiicola, Fusarium verticillioides and Fusarium oxysporum f.sp. Pisi with maximum inhibition against S. sclerotiorum (83.0 %) under in-vitro conditions. Since the strain showed promising activity against S. sclerotiorum (ITCC 4042), ultramicroscopic studies were undertaken to investigate their interaction pattern. Ultramicroscopic observations involving SEM, CLSM and AFM revealed severely altered morphology of MS16 treated S. sclerotiorum mycelia. Leaf detached bioassay accompanied with in planta studies showed potential bio-control efficiency of MS16 with 95.7 ± 2.5 % inhibition obtained in leaf detached assay, 96.5 ± 1.7 % and 98.32 ± 0.56 % inhibition in stem and leaf inoculation against S. sclerotiorum. Furthermore, root colonization resulted in prominent root architectural changes. Seed bacterization showed increase in plant growth attributes over the control under in-vitro and in planta conditions. Therefore, the overall results demonstrate the beneficial role of MS16 for growth promotion in mustard plants while controlling sclerotinia infection in mustard.
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