Qualitative and Quantitative Resistance against Early Blight Introgressed in Potato.

Early blight is a disease of potato that is caused by species, notably . The disease is usually controlled with fungicides. However, is developing resistance against fungicides, and potato cultivars with genetic resistance to early blight are currently not available.

Broad spectrum late blight resistance in potato differential set plants MaR8 and MaR9 is conferred by multiple stacked R genes.

Phytophthora infestans is the causal agent of late blight in potato. The Mexican species Solanum demissum is well known as a good resistance source. Among the 11 R gene differentials, which were introgressed from S.

SolRgene: an online database to explore disease resistance genes in tuber-bearing Solanum species.

Background: The cultivated potato (Solanum tuberosum L.) is an important food crop, but highly susceptible to many pathogens. The major threat to potato production is the Irish famine pathogen Phytophthora infestans, which causes the devastating late blight disease.

Differential recognition of Phytophthora infestans races in potato R4 breeding lines.

Introgression breeding has resulted in several potato lines that are resistant to late blight, a devastating plant disease caused by the oomycete Phytophthora infestans. The traditional differential set consists of potato lines with 11 late blight resistance specificities, referred to as R1 to R11. With the exception of the R4 locus, all the resistance loci in these lines have been genetically mapped or positioned in resistance (R) gene clusters.