Fig. 10: Model of local cell-fate decisions arising from the interplay between JA and autophagy during petal abscission.
From: Petal abscission is promoted by jasmonic acid-induced autophagy at Arabidopsis petal bases
Before induction of JA biosynthesis by AG, JAZ repressors accumulate at the base of petals to block MYC activity, leading to lower ROS levels and cell death. JA biosynthesis in stamen filaments induced by AG triggers JAZ degradation at the base of petals, allowing MYC transcription factors to recruit MED25, deposit H3K9ac, and increase chromatin accessibility for key downstream targets, such as ANAC102. Subsequently, ANAC102 accumulates at the base of petals just prior to petal abscission and promotes proper autophagy through transcriptional activation of ATG genes.
