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Colonization and endophytic establishment of diazotrophic Lysinibacillus sphaericus in Oryza sativa and its efficacy in plant growth promotion
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Colonization and endophytic establishment of diazotrophic Lysinibacillus sphaericus in Oryza sativa and its efficacy in plant growth promotion
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Journal Article
Colonization and endophytic establishment of diazotrophic Lysinibacillus sphaericus in Oryza sativa and its efficacy in plant growth promotion
2025
Overview
Lysinibacillus sphaericus, an endophytic diazotroph from rice (Oryza sativa), was investigated for colonization and growth-promoting effects. Seed bacterization introduced the endophyte, confirmed through re-isolation of antibiotic media, microscopy, and molecular identification. L. sphaericus showed efficient colonization in rice tissues, maintaining stable populations across plant parts. Light and scanning electron microscopy revealed intracellular colonization in roots of inoculated plants. The endophyte enhanced plant growth, nutrient uptake, and nitrogen fixation compared with uninoculated controls and Pseudomonas fluorescens-treated plants. Increased production of phytohormones, including indole-3-acetic acid, gibberellic acid, and cytokinins, was observed in L. sphaericus-inoculated plants, correlating with improved root and shoot development. The endophyte demonstrated biocontrol activity against rice sheath blight pathogen Rhizoctonia solani, with plants showing reduced disease severity. L. sphaericus populations remained stable in host tissues following pathogen challenge. These findings highlight L. sphaericus's potential as an endophytic diazotroph for sustainable rice cultivation, growth promotion, nutrient acquisition, and disease suppression.
Publisher
Taylor & Francis Group
