The expression pattern of a selected set of MJ-responsive genes (PpACO1, PG, PL, PpExp1, and LIM) was examined during the 28 d period following treatments in control and in MJ- and PDJ-treated fruit. In control fruit, both PpACO1 and PG transcripts became detectable at first harvest (21 d after treatment), and their amount increased dramatically at second harvest (28 d after treatment, Fig. 4). MJ and PDJ slightly inhibited PpACO1 transcription at first harvest; at second harvest, this inhibition was particularly marked with PDJ. In the case of PG, mRNA levels were dramatically reduced by both JAs only at second harvest. In controls, PL transcript was hardly detectable up to first harvest, and increased 7 d later (Fig. 4); similarly, PpExp1 was weakly expressed until second harvest. LIM transcript accumulation decreased during the considered period. While MJ enhanced PL, PpExp1, and LIM mRNA accumulation throughout, PDJ did so only at first and second harvest.