Influence of and Root Extracts on Metabolome of .

is an oomycete pathogen that infects a broad range of crops of worldwide economic interest; among them are citrus species. In general, some and the rootstocks of related genera offer considerable resistance against ; therefore, understanding the mechanisms involved in the virulence of this pathogen is crucial. In this work, secondary metabolite production was studied using matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) and ultrahigh-performance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry (UHPLC/ESI-Q-TOF-MS) combined with chemometric tools, and its metabolic profile was evaluated under the influence of (a highly susceptible host) and (a resistant genotype) extracts. The root extracts of had an influence on the growth and hyphae morphology, and the root extracts of had an influence on the zoospore behavior. In parallel, the spatial distribution of several metabolites was revealed in colonies using MALDI-MSI, and the metabolite ion of 246 was identified as the protonated molecule of Arg-Ala. The MALDI-MSI showed variations in the surface metabolite profile of under the influence of the extract. The metabolome analysis using UHPLC-ESI-Q-TOF-MS resulted in the detection of Arg-Gln (/ 303.1775), as well as L-arginine (/ 175.1191) and other unidentified metabolites. Significant variations in this metabolome were detected under the influence of the plant extracts when evaluated using UHPLC-ESI-Q-TOF-MS. Both techniques proved to be complementary, offering valuable insights at the molecular level when used to assess the impact of the plant extracts on microbial physiology in vitro. The metabolites identified in this study may play significant roles in the interaction or virulence of , but their functional characterization remains to be analyzed. Overall, these data confirm our initial hypotheses, demonstrating that has the capabilities of (i) recognizing host signals and altering its reproductive programing and (ii) distinguishing between hosts with varying responses in terms of reproduction and the production of secondary metabolites.