Biochemical study of disease resistance molecules in Solanum tarijense.

WOLSKI E. A; CAPEZIO S; HUARTE M; ANDREU A. B

Mar del Plata, Argentina

Congreso; XLIII REUNION ANUAL DE LA SOCIEDAD ARGENTINA DE INVESTIGACIONES EN BIOQUIMICA Y BIOLOGIA MOLECULAR (SAIB).; 2007

SOCIEDAD ARGENTINA DE INVESTIGACIONES EN BIOQUIMICA Y BIOLOGIA MOLECULAR (SAIB).

Horizontal resistance is a valuable tool for potato Late blight control, caused by the oomycete Phytophthora infestans. In Argentina several sources of horizontal resistance were identified and the wild species Solanum tarijense have shown high levels of it. Many studies have demonstrated that the expression of pathogenesis related proteins (PR) differ with the level of disease resistance in potato cultivars. These results suggest that the constitutive or inducible expression of PR proteins may contribute to the resistance against P.infestans. In this study, we measured the enzymatic activity of different PR proteins in the specie S. tarijense. Two potato clones with different levels of resistance were used. Both clones were more resistant to Late blight than Bintje and Pampeana cultivars, used as control. The activity of glucanases, chitinases, peroxidases and poliphenoloxidases were 8, 1.5, 2.5, and 3 times higher respectively, in S. tarijense than in Bintje and Pampeana. The results described and others needed in the future related to horizontal resistance to P.infestans in S. tarijense could lead this species to be introduced in potato breeding programs.