Pathogen toxin-indiced electrolyte leakage and phytoalexin accumulation as indices of red-rot (Colletotrichum falcatum Went) resistance in sugarcane

Abstract

A phytotoxin produced by the sugarcane red-rot fungus Colletotrichum falcatum Went was partially
purified. The phytotoxin caused increased electrolyte leakage in susceptible sugarcane varieties and higher levels of
phytoalexins (3-deoxyanthocyanidins) in resistant sugarcane varieties. This relationship between phytotoxin induced
changes and disease reaction could possibly be used as an additional index to rapidly identify red-rot resistant
varieties.