Transcriptomic and hormonal dynamics in relation to adventitious rooting of two parental Petunia species highlight a coordinated activation of the jasmonate and auxin pathways and an important role of upper-shoot-derived auxin influx

The results reveal excision-triggered coordination of jasmonate and auxin pathways in the stem base, interacting with ERF transcription factors, and indicate an important role for upper shoot-derived auxin influx, potentially regulated by salicylic acid and cytokinins. Higher rooting capacity of P. inflata can be explained by the higher IAA level in the stem base. The results indicate important roles of ERF113/114, ILR-like2 and 6, PIN6, PIN-like 1/3, the PINOID gene A4A49₁0797, ARF11, and several LBD genes in adventitious rooting of Petunia.