Summary
This in vitro study reports the first characterisation of nematicidal properties in Streptomyces violascens strain AS2, demonstrating significant activity against root-knot nematode reproduction and motility. The aqueous extract showed superior efficacy, achieving complete egg hatching inhibition at 600 µg/mL and 99% J2 immobility at 800 µg/mL within 72 hours, with enzymatic analysis revealing chitinase and protease production capable of degrading nematode eggshells. The authors propose S. violascens as a viable biocontrol agent for integration into sustainable nematode management strategies.
Regional applicability
This laboratory study's findings are potentially transferable to United Kingdom horticultural systems where root-knot nematodes pose problems, particularly in protected cultivation. However, field validation under UK environmental conditions and integration with existing organic and regenerative farming practices would be necessary before practical adoption recommendations can be made.
Key measures
Egg hatching inhibition rates; LC50 values (aqueous extract: 168.38 µg/mL; organic extract: 849.26 µg/mL); second-stage juvenile (J2) immobility percentage at 72 h; chitinase and protease enzyme production
Outcomes reported
The study evaluated the nematicidal efficacy of aqueous and ethyl acetate extracts from Streptomyces violascens against Meloidogyne sp. through in vitro assays measuring egg hatching inhibition, juvenile immobility, and enzymatic profiles.
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