Fig. 1

Tomato root early responses to Fol infection at the transcriptomic level. a Schematic diagram illustrating the process of obtaining transcriptomic data at different time points (Fol_D0, Fol_D1, Fol_D2, and Fol_D3) after Fol inoculation. b Biomass of Fol in host roots during the early invasion stage. Total DNA was isolated from tomato roots inoculated with Fol at the indicated times, and PCR was performed. c PCA results of the transcriptomic data. d Heatmap showing the hierarchical clustering of DEGs upon expression of Fol_D0, Fol_D1, Fol_D2, and Fol_D3 in tomato roots. The color scale indicates the Z score. The full lists can be found in Additional file 1: Table S1. e, f KEGG pathway-based enrichment analysis of the significant DEGs detected at 2 days (e) and 3 days (f) after Fol inoculation relative to those of tomato roots prior to Fol inoculation (Fol_D0)