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Lycopersicon pennellii  accession LA 1277 was crossed to tomato ( L. esculentum ) and the F 1  was backcrossed to tomato. Self-pollinated seed was saved from backcross plants and seedlings derived were inoculated with  Fusarium oxysporum  Schlecht f.sp.  radicus-lycopersici  Jarvis and Shoemaker, the causal agent of Fusarium crown and root rot (FCRR). Seed was saved from resistant plants that were self-pollinated and screened until homozygous resistance was verified five generations after the backcross. Three homozygous lines were crossed to Fla. 7547, a tomato breeding line susceptible to FCRR but resistant to Fusarium wilt races 1, 2, and 3. Subsequently, backcrosses were made to each parent and F 2  seed were obtained. The three homozygous FCRR-resistant lines were also crossed to Ohio 89-1, which has a dominant gene for FCRR resistance presently being used in breeding programs. F 2  seed were obtained from these crosses. These generations were inoculated with the FCRR pathogen. The resistant parents, F 1 , and backcross to the resistant parents were all healthy. The backcross to the susceptible parent and the F 2  segregated healthy to susceptible plants in 1:1 and 3:1 ratios, respectively. Thus, the resistance from LA 1277 was inherited as a single dominant gene. This gene was different than the gene from Ohio 89-1 because susceptible segregants were detected in the F 2  generation derived from the two resistant sources.

hortscience

Inheritance of Resistance to Fusarium oxysporum f. sp. radicus-lycopersici, Causal Organism of Fusarium Crown and Root Rot in Tomato from Lycopersicon pennellii LA 1277