Phenotypic and genotypic characterization to authenticate and trace a high-quality yellow tomato ecotype through the processing chain

•High-quality Giagiù products aroused a growing interest in consumers and chefs.•Morphological description revealed two distinctive traits of Giagiù yellow ecotype.•Genotypic analysis evidenced three E40 private mutations on three chromosomes.•Three CAPS marker identified to authenticate and trace Giagiù food products.