Resistance to powdery mildew (Erysiphe polygoni) and yield on afila pea (Pisum sativum L.)

Oscar Checa; Marino Rodríguez

Resistance to powdery mildew (Erysiphe polygoni) and yield on afila pea (Pisum sativum L.)

2015

Oscar Checa | Marino Rodríguez

In the past five years in the department of Nariño, the increase in severity of damage produced by oidio (Erysiphe polygoni) in vetch has been observed, which produces loss of yield crop between 20 and 40%. The improved varieties present susceptibility to the pathogen. This research was conducted in SENA’s Lopez Farm in Pasto - Colombia, in two phases. In the first phase, 90 lines of pea were evaluated (Pisum sativum L.) along with the gen afila for yield and reaction to powdery mildew (Erysiphe polygoni) under natural inoculate conditions. The assessed lines were obtained by simple crosses and backcrosses between the parentals Andina, San Isidro, and Sindamanoy, and the donor genotypes of the afila gen: Dove, ILS3568 and ILS3575. A random augmented blocks design was used. Results showed that 10% of the materials were resistant to powdery mildew, 20% were moderately resistant, 60% were moderately susceptible, and 10% were susceptible. From these materials, 19 resistant and moderately resistant genotypes with the highest yield were selected, which were assessed in the second phase for yield and components. For green pod yield and dry grain, 84% and 68.4% of the tested lines reached similar averages than those in the commercial controls Sindamanoy and Andina. The selected lines with the gen afila recovered 88,42% of the yield and yield components from their parents Andina, San Isidro, and Sindamanoy.

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