Overexpression of TaSTP13 resulted in increased Arabidopsis susceptibility to powdery mildew. a Representative images of Arabidopsis leaves of indicated genotypes infected with tobacco powdery mildew at 12 dpi. Note, TaSTP13 overexpression lines were more susceptible than Col-0. b Quantification of spore production in the indicated genotypes at 12 dpi normalized to leaf fresh weight (FW). Data represent the mean ± SD of three samples (n = 3, four leaves each) from one experiment, which was repeated three times with similar results. c Representative microscopic images of single colonies of powdery mildew on leaves of indicated genotypes at 5 dpi. Fungal structures were stained by trypan blue. Bars, 200 μm. d Total number of conidiophores per colony on leaves of indicated genotypes at 5 dpi. The bar-chart shows combined data from three independent experiments (at least 50 colonies were counted for each genotype per experiment). e Glucose concentrations in TaSTP13 overexpression (OE) lines and wild-type leaves. Values are the mean ± SD of three independent biological replicates. Double asterisks indicate a significant difference (P < 0.01) according to the Student’s t-test and one-way ANOVA in comparison with WT.