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Agronomía Colombiana

versão impressa ISSN 0120-9965

Resumo

BALLESTEROS, Diana Carolina et al. Possible presence of a gene R1 in germplasm of Solanum tuberosum Phureja Group. Agron. colomb. [online]. 2010, vol.28, n.2, pp.137-146. ISSN 0120-9965.

Phytophthora infestans causes late blight in potato. This disease is the most destructive worldwide. Developing cultivars resistant to the pathogen is the most important strategy for its control, so identification of resistance genes (Rpi) is fundamental to support breeding programs. Introgression of Rpi from wild or native species within cultivars can be a good way to develop resistant cultivars. S. phureja has important culinary and nutrional traits and has been identified as a source of resistance to late blight. 88 accessions of S. phureja were genotypically characterized with molecular SCAR markers, the resistance gene R1 for P. infestans, the candidate gene StAOS2 and a CAPS marker linked to loci for resistance to P. infestans in Solanum tuberosum. Polymorphism was presented in Prp1 and R1 markers. The R1 marker amplification showed the 1,400 pb allele, which represents the R1 gene allele in 17 S. phureja accessions suggesting that these accessions could possibly have a homologous gene to the R1 gene identified in S. demissum

Palavras-chave : Phytophthora infestans; late blight resistance; molecular characterization; diagnostic markers; Solanum phureja.

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