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 <i>P. inflata</i> can be explained by the higher IAA level in the stem base. The results indicate important roles of <i>ERF113/114</i>, <i>ILR-like2 and 6</i>, <i>PIN6</i>, <i>PIN-like 1/3</i>, the <i>PINOID</i> gene <i>A4A49_10797</i>, <i>ARF11</i>, and several <i>LBD</i> genes in adventitious rooting of <i>Petunia</i>.