LEAF RUST RESISTANCE IN WINTER BARLEY CULTIVARS AND BREEDING LINES

摘要

Leaf rust is economically important disease of barley in many barley growing countries including Poland. A total of 25 winter barley cultivars and breeding lines were tested for leaf rust resistance with eight differential isolates. These isolates originated from IHAR Radzikow collection and were chosen according to their virulence spectra. Among 25 cultivars and breeding lines only 7 (28%) showed resistance reaction after inoculation with at least one isolate of P. hordei. In only one cultivar Kroton it was possible to postulate the presence of specific resistance genes which were Rph2 and Rph6, Eighteen (72%) cultivars and breeding lines showed susceptible reaction after inoculation with all isolates used. Based on results, we can conclude that these cultivars have no resistance' gene to P. hordei or they may have one or combination of three resistance genes (Rphl, RphlO, Rphll). Among tested cultivars and breeding lines the most resistant was breeding line POA 2099. It showed resistance for inoculation with 3 isolates of P. hordei. Only 5.0% of infection types observed on plants of tested cultivars and breeding lines were classified as leaf rust resistance [scores 0 (2%) and 2 (3%)]. None of tested cultivars and breeding lines showed resistancereaction types 0; and 1. Different strategies for control of barley leaf rust were discussed.