Antagonistic Efficacy of Symbiotic Bacterium sp. SCG against spp.

The inhabitation and parasitism of root-knot nematodes (RKNs) can be difficult to control, as its symptoms can be easily confused with other plant diseases; hence, identifying and controlling the occurrence of RKNs in plants remains an ongoing challenge. Moreover, there are only a few biological agents for controlling these harmful nematodes. In this study, sp. SCG isolated from entomopathogenic nematodes of genus was evaluated for nematicidal effects under in vitro and greenhouse conditions. The cell-free filtrates of strain SCG showed nematicidal activity against species J2s, with mortalities of > 88% at a final concentration of 10%, as well as significant nematicidal activity against the three other genera of plant-parasitic nematodes in a dose-dependent manner. Thymine was isolated as active compounds by assay-guided fractionation and showed high nematicidal activity against . Greenhouse experiments suggested that cell-free filtrates of strain SCG efficiently controlled the nematode population in -infested tomatoes ( L., cv. Rutgers). In addition, a significant increase in host plant growth was observed after 45 days of treatment. To our knowledge, this is the first to demonstrate the nematicidal activity spectrum of isolated species and their application to L., cv. Rutgers under greenhouse conditions. sp. SCG could be a promising biological nematicidal agent with plant growth-enhancing properties.