Abstract

RUBIO COVARRUBIAS, Oswaldo Angel; CADENA HINOJOSA, Mateo Armando  and  FLORES LOPEZ, Román. Comparison of vertical and horizontal resistance against late blight of potato in Toluca. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.4, pp.755-766. ISSN 2007-0934.

One of the main problems of potato cultivation in Mexico and worldwide is late blight (Phytophthora infestans). During three years evaluations under field conditions Toluca Valley, the center of origin of P. infestans were to compare 10 genotypes of the population A vertical resistance (combination of higher R genes and minor genes) and 10 genotypes population B with horizontal resistance (no R genes). A population was generated by INIFAP in Mexico and Peru B population by the International Potato Center. The results showed that the population A was significantly higher in the 5 variables that were used to evaluate the resistance [relative area under the curve of infection, slope (slope of the linear regression: time vs. % leaf infection), % of foliar lesions covered by sporangia, number of days after emergence of the plants when the first foliar infection and tuber yield was observed]. These results indicate that minor resistance genes of the population B operate less efficiently than when combined with R genes, as in the population A.

Keywords : Solanum tuberosum; Phytophthora infestans; major and minor genes.

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