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<p>This study aimed to identify and characterize native rhizobacteria associated with kiwifruit (<i>Actinidia deliciosa</i>) for their potential as biocontrol agents against <i>Fusarium</i> root rot and as plant growth promoters. A total of 51 bacterial strains were isolated from the rhizospheric and endophytic regions of orchards in Himachal Pradesh, India. The isolates were screened for antagonistic activity against <i>Fusarium oxysporum</i> and multiple plant growth-promoting (PGP) traits. Quantitative assays revealed phosphate solubilization (36.53–206.12&#xa0;µg/mL), siderophore production (33.98–379.30%), and indole-3-acetic acid (IAA) synthesis (22.74–81.91&#xa0;µg/mL), the selection for in vivo evaluation was prioritized based on antagonistic potential. Three strains (KER7, KER19, and KR14), exhibiting maximum mycelial growth inhibition (38.77%–46.79%) alongside multifarious PGP traits, were selected for pot trials. Inoculation with these strains significantly reduced disease incidence and enhanced plant vigor compared to the controls. 16&#xa0;S rRNA gene sequencing identified the most promising isolates as <i>Enterobacter hormaechei</i> (KER7) and <i>Pseudomonas aeruginosa</i> (KER19). Although <i>P. aeruginosa</i> showed high efficacy, biosafety considerations prioritize <i>E. hormaechei</i> as the candidate for sustainable kiwifruit cultivation.</p>

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Biocontrol and plant growth-promoting potential of native rhizobacteria from Actinidia deliciosa against Fusarium root rot

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • Ritika Gupta,
  • Shalini Verma,
  • Sunil Kumar,
  • Manica Tomar,
  • Anjali Chauhan

摘要

This study aimed to identify and characterize native rhizobacteria associated with kiwifruit (Actinidia deliciosa) for their potential as biocontrol agents against Fusarium root rot and as plant growth promoters. A total of 51 bacterial strains were isolated from the rhizospheric and endophytic regions of orchards in Himachal Pradesh, India. The isolates were screened for antagonistic activity against Fusarium oxysporum and multiple plant growth-promoting (PGP) traits. Quantitative assays revealed phosphate solubilization (36.53–206.12 µg/mL), siderophore production (33.98–379.30%), and indole-3-acetic acid (IAA) synthesis (22.74–81.91 µg/mL), the selection for in vivo evaluation was prioritized based on antagonistic potential. Three strains (KER7, KER19, and KR14), exhibiting maximum mycelial growth inhibition (38.77%–46.79%) alongside multifarious PGP traits, were selected for pot trials. Inoculation with these strains significantly reduced disease incidence and enhanced plant vigor compared to the controls. 16 S rRNA gene sequencing identified the most promising isolates as Enterobacter hormaechei (KER7) and Pseudomonas aeruginosa (KER19). Although P. aeruginosa showed high efficacy, biosafety considerations prioritize E. hormaechei as the candidate for sustainable kiwifruit cultivation.