Molecular and functional characterization of Trichoderma harzianum T39 determinants of resistance induction in grapevine

Plasmopara viticola, the causal agent of downy mildew, is one of the most damaging diseases of grapevine (Vitis vitifera) worldwide. In grapevine, Trichoderma harzianum T39 activates a plant-mediated systemic resistance and significantly reduces downy mildew symptoms. Preliminary results suggest an implication of T39 biological status (i.e. grown conditions and ages of conidia) in the biocontrol efficacy. To further understand the mechanisms of T39-induced resistance, we aimed to characterize the fungal features for an efficient self-protection activation in grapevine. By the parallel characterization of fungal and plant genes, the impact and properties of the resistance inducer will be determined. This study will help to understand the role of physiological factors in the efficacy of biocontrol agents, in order to maximize their effect especially during changes of abiotic conditions