Promotes leaf senescence mediated by abscisic acid (ABA), salicylic acid (SA) and jasmonic acid (MeJA), probably though the induction of expression of senescence-associated genes (SAGs) and defense-related genes. Present in cytoplasmic foci. Age-dependent accumulation in rosette leaves. Impaired abscisic acid- (ABA)-, salicylic acid- (SA)- and jasmonic acid- (MeJA)-induced leaf senescence in detached leaves. Belongs to the LARP family.