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September 10, 2026European Journal of Plant PathologyOpen Access

Brazilian actinobacteria with antagonistic activity against Rhizoctonia solani and Xanthomonas euvesicatoria pv. perforans in tomato

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Authors

MSMoisés Rodrigues SilvaUniversidade Federal de GoiásMCMarcos Gomes da CunhaUniversidade Federal de GoiásEMEder MarquesUniversidade Federal de Goiás

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Implication

Laboratory and greenhouse testing demonstrates targeted disease suppression by soil actinobacteria in tomato plants, indicating that biocontrol efficacy depends on application methods.

Key Points

  • To evaluate the antagonistic potential and biocontrol efficacy of Brazilian rhizospheric actinobacteria against Rhizoctonia solani and Xanthomonas euvesicatoria pv. perforans in tomato plants.
  • Characterized eight actinobacterial isolates from sugarcane and tomato rhizospheres using morphology and multilocus sequencing of 16S rRNA, atpD, and rpoB genes.
  • Conducted in vitro assays testing mycelial inhibition of R. solani and antibacterial zone formation against X. euvesicatoria pv. perforans.
  • Assessed in vivo disease suppression of collar rot and bacterial spot in greenhouse tomato trials using varied actinobacterial preparations and delivery routes.
  • In vitro, Streptomyces noursei (NPF62) and S. lydicus (NPF59) showed top antifungal activity against R. solani, while S. eurocidicus (NPF57) yielded antibacterial inhibition zones up to 0.43 cm against X. euvesicatoria pv. perforans.
  • Greenhouse treatments failed to significantly decrease collar rot severity caused by R. solani compared with pathogen-inoculated controls.
  • Soil drenching with a spore suspension of Streptomyces aquilus (NPF60) significantly reduced tomato bacterial spot disease intensity relative to controls.

Cite This Study

Silva et al. (2026) studied this question.

synapsesocial.com/papers/6aa27bcf58559d80afc75502https://doi.org/10.1007/s10658-026-03313-3
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