Characterization and bioefficacy of green nanosilver particles derived from fungicide-tolerant Tricho-fusant for efficient biocontrol of stem rot (Sclerotium rolfsii Sacc.) in groundnut (Arachis hypogaea L.)

Darshna G. Hirpara; Harsukh P. Gajera; Disha D. Savaliya; Rushita V. Bhadani

doi:10.1007/s12275-021-1344-9

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Characterization and bioefficacy of green nanosilver particles derived from fungicide-tolerant Tricho-fusant for efficient biocontrol of stem rot (Sclerotium rolfsii Sacc.) in groundnut (Arachis hypogaea L.): Darshna G. Hirpara , Harsukh P. Gajera , Disha D. Savaliya , Rushita V. Bhadani; Journal of Microbiology 2021;59(11):1031-1043.
DOI: https://doi.org/10.1007/s12275-021-1344-9
Published online: October 6, 2021

Department of Biotechnology, College of Agriculture, Junagadh Agricultural University, Junagadh 362 001, Gujarat, IndiaDepartment of Biotechnology, College of Agriculture, Junagadh Agricultural University, Junagadh 362 001, Gujarat, India

Corresponding author: Harsukh P. Gajera ,

Received: 28 June 2021 • Revised: 6 September 2021 • Accepted: 7 September 2021

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Abstract

An efficient and eco-friendly bioefficacy of potent Trichofusant (Fu21) and its green nanosilver formulation against stem rot (Sclerotium rolfsii) in groundnut was established. Fu21 demonstrated higher in-vitro growth inhibition of pathogen with better fungicide tolerance than the parental strains. The green nanosilver particles were synthesized from the extracellular metabolites of Fu21 and characterized for shape (spherical, 59.34 nm in scanning electron microscope), purity (3.00 KeV, energy dispersive X-ray analysis), size (54.3 nm in particle size analyzer), and stability (53.7 mv, zeta). The field efficacy study exhibited that the seedling emergence was high in seeds treated with green nanosilver (minimum inhibitory concentration-[MIC] 20 μg Ag/ml), and a low disease severity index of stem rot during the crop growth was followed by the live antagonist (Fu21) in addition to seed treatment with a fungicide mix under pathogen infestation. The seed quality analysis of harvested pods revealed a high oil content with balanced fatty acid composition (3.10 oleic/linoleic acid ratio) in green nanosilver treatment under pathogen infestation. The residual analysis suggested that green nanosilver applied at the MIC level as seed treatment yielded similar effects as the control for silver residue in the harvested groundnut seeds. The green nanosilver at MIC has a high pod-yield under S. rolfsii infestation, demonstrating green chemistry and sustainability of the nanoproduct.

Keywords: Salmonella Typhimurium;pat;protein acetylation;pta

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Characterization and bioefficacy of green nanosilver particles derived from fungicide-tolerant Tricho-fusant for efficient biocontrol of stem rot (Sclerotium rolfsii Sacc.) in groundnut (Arachis hypogaea L.)

J. Microbiol. 2021;59(11):1031-1043. Published online October 6, 2021

DOI: https://doi.org/10.1007/s12275-021-1344-9

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