Alternaria Pathosystems for Study of Citrus Diseases

摘要

Leaf spot disease of rough lemon and brown spot disease of tangerines caused by distinct pathotypes of Alternaria alternata, and postharvest fruit black rot disease caused by A. citri, are the three major fungal diseases of citrus. The pathogenicity and specificity for the pathogens of Alternaria leaf spot and brown spot diseases are associated with the production of different host-specific toxins designated as ACR- and ACT-toxins. Production of endopolygalacturonase plays a role in causing disease symptoms of Black rot pathogen of A. citri. This review summarizes the recent progress on these citrus pathomodels.