Submitted to: Journal of American Society of Horticulture Science
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1997
Publication Date: N/A
Technical Abstract: Anthracnose is a serious tomato fruit rot disease. Transfer of resistance from resistant breeding lines or Plant Introductions (PI) to elite materials has proven difficult. Populations were developed from a cross between a large fruited susceptible and resistant breeding line (88B147) with resistance derived from Lycopersicon esculentum var. cerasiforme PI 272636. Analysis of anthracnose resistance in puncture inoculated fruit indicated small, but significant, additive effects for resistance. Additional populations developed from crosses of a susceptible processing tomato cultivar with: 1) the resistant PI 272636, 2) an unadapted small fruited resistant line developed from PI 272636, and 3) the breeding line 88B147, also with resistance derived from PI 272636. Small additive effects identified in large fruited material, in comparison to the resistant PI, suggests that resistance loci have been lost during germplasm development. This is consistent with the relatively larger lesions observed in large fruited lines derived from PI 272636. Positive correlations were noted between small fruit size and high levels of anthracnose resistance. Identification of molecular markers linked to resistance genes will be discussed.