The number of genes controlling resistance to Pyrenophora teres Drechs. strains in barley

摘要

Using a new procedure for inoculation of F2 plants with various Pyrenophora teres strains (from Europe, United States, Canada, and Australia), the genetic control of resistance in 12 barley genotypes of different origin was studied. Segregation forresistance in the F2 from crosses between these genotypes and susceptible cultivars showed that, in each genotype, one or two genes determined resistance to most strains; however, some additional genes were only effective against particular strains. In each genotype, 2-5 genes conferred resistance to different P. teres strains. This indicates the occurrence of balanced polymorphism of host resistance and pathogen virulence.