Comparative Metabolomic Analysis of Four Fabaceae and Relationship to In Vitro Nematicidal Activity against .

The grapevine fanleaf virus (GFLV), responsible for fanleaf degeneration, is spread in vineyards by the soil nematode . Nematicide molecules were used to limit the spread of the disease until they were banned due to negative environmental impacts. Therefore, there is a growing interest in alternative methods, including plant-derived products with antagonistic effects to . In this work, we evaluated the nematicidal potential of the aerial parts and roots of four : sainfoin (, birdsfoot trefoil (, sweet clover (, and red clover (, as well as that of sainfoin-based commercial pellets. For all tested plants, either aerial or root parts, or both of them, exhibited a nematicidal effect on in vitro, pellets being as effective as freshly harvested plants. Comparative metabolomic analyses did not reveal molecules or molecule families specifically associated with antagonistic properties toward , suggesting that the nematicidal effect is the result of a combination of different molecules rather than associated with a single compound. Finally, scanning electron microscope observations did not reveal the visible impact of extract on cuticle, suggesting that alteration of the cuticle may not be the primary cause of their nematicidal effect.