RT-PCR analysis of the expression pattern of rose POMT. 26S rRNA was analyzed as a control. S4, S5, S6, and S7, Petals from flowering stages 4 to 7, respectively; ST, stamina at stage 6; SE, sepals at stage 6; LF, leaves; 10, 15, 20, and 25, number of PCR cycles. cDNAs of POMT (petals in stage 7) and 26S rRNA from stamina were used as templates.