infestans resistance genes from this species should be straightforward, requiring few backcrosses to incorporate resistance into elite tomato cultivars. VI030462 is particularly interesting because it is an important source of whitefly resistance and transfer of P. habrochaites either failed or no major quantitative trail loci (QTLs) were detected. However, the pathogen is highly diverse and aggressive isolates such as Pi411 from Taiwan overcome resistance genes Ph-1, Ph-2, Ph-3 and Ph-4.įortunately, WorldVeg identified resistance to Pi411 in several accessions of tomato wild relatives S. habrochaites and S. The World Vegetable Center (WorldVeg) and other tomato breeders have developed late blight-resistant lines with Ph-3 or combined with Ph-2. So far six late blight resistance genes/genomic regions ( Ph-1, Ph-2, Ph-3, Ph-4, Ph-5-1 and Ph-5-2) have been identified from the wild relative S. Late blight of tomato, caused by the heterothallic oomycete Phytophthora infestans (Mont.) de Bary, is one of the most destructive diseases of tomato, especially in cool and wet environments. Host resistance has the potential to be a key component in managing late blight of tomato and enable farmers to reduce fungicide use.
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