To explore whether HGLs respond to infection with a further increase in defence gene expression, transcript amounts for PR protein genes were determined at 24 hpi with Pst (strain 11528) or Psm. HGLs displayed a substantial further induction of PR protein genes in response to both pathovars, the effect being even more pronounced for infection with Psm (Fig. 7A; for comparison with non-infected plants, see Fig. 4). This evidence concerns the gene TMEM37 and infection.