KLK15 and infection: Two (AC169513_37.4 and AC125389_65.5) and three (AC146817_41.4, AC174337_15.4 and AC202309_24.3) putative ACO genes, involved in the final step of ET production, were up regulated upon infection with P. pisi at 6 and 20 hpi, respectively (from 1.5 to 2.9 fold).