CDKN2A and infection: When leaves of two wheat cultivars with contrasting resistance to rust were infected with Puccinia triticina, distinct expression patterns of five ARF genes (TaARF4/6/12/16/27) demonstrated their opposite roles in incompatible (R-Pathogen) and compatible (S-Pathogen) interactions in response to this pathogen infection (Chandra et al., 2020).