Transcription factor that specifically binds AT-rich DNA sequences related to the nuclear matrix attachment regions (MARs) (By similarity). Binds the DNA sequence GNFEI (GA-negative feedback element I) in the GA3OX1 promoter (PubMed:17277098). Negatively regulates plant innate immunity (PTI) to pathogens through the down-regulation of the PAMP-triggered FRK1 expression (PubMed:20738724). The PPC domain mediates interactions between AHL proteins. Overexpression of AHL15 results in a decreased flg22-induced expression of FRK1.