The results of transcriptome sequencing showed that the expression of key genes in the JA, salicylic acid (SA), and ethylene (ET) biosynthetic and signaling pathways, such as key genes for lipoxygenases (LOXs), 12-oxophytodienoate reductases (OPRs), MYC2 transcription factors, ACC oxidase (ACO), ethylene-responsive factors (ERFs), phenylpropane lyase (PAL), and PBS3 (a GH3 acyl adenylase family enzyme), were significantly upregulated during infection of tea leaves by C. camelliae (Supplementary Data Table S5, Supplementary Data Fig. S6). Here, KLK15 is linked to infection.