Expresión diferencial durante la interacción Solanum tuberosum - Phytophthora infestans

potato (solanum tuberosum l.) is the fourth most important crop worldwide; also, is the agriculture product with most fungicides, insecticides and chemical fertilizers requirement. worldwide losses caused by phytophthora infestans (mont.) de bary in this crop, amount to 6,7 billion dollars per year and its chemical control increase production costs, harming human health and environment. for these reasons, is necessary constant research for alternative mechanisms to control disease, including development of resistant varieties using cis-genesis from wild genotypes. as a contribution in this way, and the lack of knowledge of what controls and is the difference between compatible and incompatible interaction, in this study we compared gene expression profiles obtained by differential display from resistant and susceptible varieties, during their interaction with p. infestans. the results showed differences in gene expression between resistant and susceptible varieties, at different times post-inoculation as well as exchange expression rate, including the presence and absence of differential bands and increase or decrease in their intensity. after analyzing the sequences of differential expressed fragments, we found that some overexpressed fragments from susceptible varieties had homology with an encoded sequence for a serine-acetyltransferase and for a rna polymerase β subunit. on the other hand, overexpressed fragments from resistant variety, had homology with an encoded sequence for a transmembrane domain.