Confers resistance to the necrotrophic fungus Alternaria brassicicola. Possesses lipase and antimicrobial activities that directly disrupt fungal spore integrity. Triggers systemic resistance, mostly by the ethylene-dependent pathway. Secreted upon salicylic acid treatment. By ethylene. In the resistant cv. Columbia (glip1-1 and glip1-2), confers susceptibility to A.brassicicola. Belongs to the 'GDSL' lipolytic enzyme family.