Evaluación de la respuesta de líneas de cebada frente a Puccinia striiformis f. sp. hordei en la parroquia Licto del cantón Riobamba, provincia de Chimborazo.

Abstract

This investigation aimed to evaluate the response of 15 barley lines against (Puccinia striiformis f sp. hordei). An experimental design of randomized complete blocks (RCBD) was used with 15 treatments of isogenic barley lines and three replications from the University of Saskatchewan (Canada) and National Institute of Agricultural Research (INIAP), it was developed in plots of 1m². For severity, the modified Cobb's diagrammatic scale was used, which presented two values, the actual percentage of rust urediniums and the degree of rust severity with values from 1% to 100%, and evaluated variables were percentage of emergence at 15 days, plant vigor, days to bolting, plant height (cm), characterization of yellow rust in the laboratory, incidence and severity caused by yellow rust, spike size, number of grains per spike, weight and yield. The outstanding results showed significant differences (P<0.05) in the evaluation of the response ofbarley lines for the variables incidence and severity caused by yellow rust, vertical resistance was obtained for the 15 isogenic barley lines. It is concluded that (Bancroft) had the highest susceptibility to stripe rust and (Heils Franken) had the highest resistance. It is recommended to repeat the experiment in other barley growing areas to bring new genetic modifications.