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Sixteen tomato [ Solanum lycopersicum  L. (syn.  Lycopersicon esculentum  Mill.)] genotypes (inbred lines or hybrids) were tested against five  Phytophthora infestans  (Mont.) deBary isolates to characterize race specificity of late blight resistance transferred to tomato from  Solanum pimpinellifolium  L. [syn.  Lycopersicon pimpinellifolium  (L.) Mill.] accession L3708. The effects of plant genotype, isolate, genotype × isolate, and isolate × replication interactions were highly significant ( P  = 0.001). Set of four sister lines fixed for late blight resistance (CU-R lines) exhibited full and equal resistance to the five pathogen isolates tested. In contrast, the heterozygous F 1  hybrids, created by crossing the resistant CU-R lines with a susceptible parent, were resistant to US-11; partially resistant to US-17, NC-1, and DR4B; and susceptible to US-7. Differential responses were also observed across pathogen isolates on a set of resistant sister lines (CLN-R lines), which also were bred from L3708. The CLN-R lines were resistant to the DR4B, NC-1, and US-11 isolates, but showed significant disease-affected areas and sporangium numbers following inoculation with either US-7 or US-17. Restriction fragment length polymorphism (RFLP) analysis confirms that both CU-R and CLN-R are homozygous for the  Ph-3  gene derived from L3708. Since progeny tests also confirmed that the CLN-R lines are fixed for their level of resistance, these results suggest that late blight resistance in the CU-R lines is not controlled by  Ph-3  alone, and that at least one additional gene conferring late blight resistance is missing from the CLN-R lines. Results of genetic tests of the (CU-R × CLN-R) F 1  and a (CU-R × CLN-R) F 2  population with the pathogen isolate US-17 strongly support a model in which resistance of the CU-R lines requires genes in addition to  Ph-3 . The implications of this information in breeding for late blight resistance and using of the resulting resistant lines or hybrids are discussed.

journal of the american society for horticultural science

Characterization of Late Blight Resistance Derived from Solanum pimpinellifolium L3708 against Multiple Isolates of the Pathogen Phytophthora infestans