SOCS2 and infection: We also checked the expression patterns of the predicted barley homologous genes of SSI2, GLI1, and GLY1 in PLEXdb (Plant Expression Database), and found that the expression of HvSSI2 (GenBank: AK353961.1) and HvGLI1 (GenBank: AK252700.1) was induced by various powdery mildew isolates in different barley genotypes, while the expression of the HvGLY1 (Probe Set ID: Contig 23957) gene was down-regulated post-infection (Figures S11–S13; Caldo et al., 2004).