We found that the expression levels of the upstream genes ICSI, EDS1, and PAD4 were higher at 0 (without inoculation) and 12 hpi, whereas their expression was significantly reduced in CsUGT87E7-silenced plants when compared with the controls 24 h after infection (Figure  6, B), indicating that silencing of CsUGT87E7 affects SA biosynthesis in infected leaves of tea plants during pathogen infection. This evidence concerns the gene PADI4 and infection.