Moreover, an up-regulation of AGO2 expression after infection was reported in Arabidopsis after infection by the biotrophic bacteria P. syringae, in the oil crop B. napus infected by the fungal necrotrophic Sclerotinia sclerotiorum, and in the cowpea Vigna unguiculata infected by CPSMV [20,82,84]. This evidence concerns the gene AGO2 and infection.