Involved in modulation of redox homeostasis to regulate leaf senescence mediated by age and stress factors during plant development. Its function is dependent of EIN2, a central factor of ethylene signaling. Expressed in leaves (PubMed:12650614). Expressed in 7-day-old seedlings, roots, rosette leaves, cauline leaves and flower buds (PubMed:21940719). Up-regulated during leaf senescence. Induced by abscisic acid (ABA), salicylate (SA), methyl jasmonate (MeJA) and ethylene. Delayed age-dependent and darkness-induced senescence. Increased resistance to oxidative stress. Plants overexpressing AAF exhibit increased root growth, elevated level of cellular reactive oxygen species (ROS), enhanced sensitivity to oxidative stress, and early leaf senescence induced by continuous darkness and by age-dependent signaling. Belongs to the ATA15/OSA15 family.