Fuente: WIPO "tomato" Antipathogenic polypeptides and related compounds and compositions that display antipathogenic activity, antifungal activity (i.e., act as fungicides), antialgal activity (i.e., act as algaecides), and/or enzymatic activity against chitin (i.e., degrade chitin) and/or polyglucuronic acid (i.e., degrade the polyglucuronic acid) are described. These antipathogenic polypeptides, as well the related compounds and compositions disclosed herein, can be used in protecting/treating products, including but not limited to agricultural products and water bodies (including drinking water), from pathogens, including fungi and algae, as well as generating pathogen-resistant products (particularly fungi-resistant and/or algae-resistant products).