Unité de Génie Enzymatique et Cellulaire, UMR CNRS 7025, Sorbonne Universités, Université de Technologie de Compiègne, SFR Condorcet FR CNRS 3417, Compiègne, France.
Unité Résistance Induite et Bioprotection des Plantes, EA 4707, Université de Reims Champagne Ardenne, SFR Condorcet FR CNRS 3417, Reims, France.
Phytopathology. 2020 Apr;110(4):834-842. doi: 10.1094/PHYTO-07-19-0275-R. Epub 2020 Mar 2.
The rapeseed crop () has to cope with fungal diseases that significantly impacts yields. In particular, the fungal pathogen , the causal agent of blackleg disease (also named Phoma stem canker), is a worldwide issue to this crop. Considering environmental concerns, it is essential to propose alternative natural compounds for rapeseed crop protection to reduce chemical fungicide use. Here we report data showing the efficacy of semipurified rhamnolipid (RL) mixes from bacterial origin to protect rapeseed against at early stages of infection in controlled conditions. In addition, we show that RL solutions have excellent adhesion properties when sprayed onto rapeseed leaves, without adding any adjuvant. We demonstrate that RL mixes display direct antimycelial properties against the pathogen and stimulate plant defense responses in rapeseed. Our results validate, a preventive action of low RL concentrations to protect rapeseed against and a curative effect in specific conditions when applied after the inoculation of the pathogen spores. Semipurified RL mixes therefore appear to be real cost-effective compounds that could be used in fields as biocontrol products to fight early infections of rapeseed.
油菜作物（）必须应对真菌病害，这些病害会严重影响产量。特别是真菌病原体，即黑胫病（也称为茎溃疡病）的病原体，是该作物的全球性问题。考虑到环境问题，必须提出替代油菜作物保护的天然化合物，以减少化学杀菌剂的使用。在这里，我们报告的数据显示，细菌来源的半纯化鼠李糖脂（RL）混合物在受控条件下对油菜的早期感染具有保护作用。此外，我们还表明，RL 溶液在喷洒到油菜叶片上时具有极好的附着力，而无需添加任何助剂。我们证明 RL 混合物对病原体具有直接的抗真菌特性，并刺激油菜的植物防御反应。我们的结果验证了 RL 低浓度混合物具有预防作用，可以保护油菜免受 的侵害，并且在特定条件下具有治疗作用，即在接种病原体孢子后应用。因此，半纯化 RL 混合物似乎是一种具有成本效益的化合物，可以在田间用作生物防治产品，以对抗油菜的早期感染。
