Accordingly, reduced accumulation of RT-derived Bc-sRNAs in bcrdr1 ko mutants resulted in increased mRNA levels of BcGypsy3 (S7C Fig) and upregulation of BcGypsy mRNAs during tomato infection was only measured with B. cinerea WT, but not with bcrdr1 ko mutants (S7D–S7E Fig), suggesting a potential role of BcRDR1 in post-transcriptional silencing of RTs. Here, KRT8 is linked to infection.