Fuente: WIPO "tomato" The present disclosure relates to an in vitro or ex vivo use of ALDH3A2 downstream noncoding variant, wherein said ALDH3A2 downstream noncoding variant is a sequence identical to a sequence selected from the list consisting of SEQ. ID 2, SEQ. ID 3, SEQ. ID 4, as a biomarker for determining the color phenotype of a Psittaciforme species.