Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 10, 2000
Publication Date: N/A
Technical Abstract: In North America, anthracnose is the most serious ripe fruit disease of tomatoes grown for processing. It is endemic in the midwestern United States and south-central Canada. This fruit rot disease is caused primarily by C. coccodes but can also be elicited by a number of other Colletotrichum species. Rainfall, warm temperatures, and high humidity which occur at harvest favor disease development. If left uncontrolled, serious crop losses and reduced crop quality occur. High levels of resistance have been identified in small-fruited Lycopersicon accessions. Transfer of comparable levels of genetic resistance from these unadapted materials to elite commercial tomato lines has proven difficult. Using segregating populations developed from crosses between anthracnose susceptible processing lines and the resistant L. esculentum Plant Introduction 272636, molecular markers associated with anthracnose resistance were identified. Genetic effects and heritability were also evaluated. Genetic analysis demonstrated that resistance was primarily additive and that resistance was influenced by at least three genetic factors in this cross. Additional RIL analysis and use of these markers in marker assisted breeding will be discussed.