<i><scp>A</scp>a<scp>ORA</scp></i>, a trichomeāspecific <scp>AP</scp>2/<scp>ERF</scp> transcription factor of <i><scp>A</scp>rtemisia annua</i>, is a positive regulator in the artemisinin biosynthetic pathway and in disease resistance to <i><scp>B</scp>otrytis cinerea</i>