Contribution of non-specific leaf rust resistance In Yugoslav wheat production and breeding

Abstract

The term of the non-specific resistance is based on interactions between different aviable virulences of pathogen and host genotype without significant differences in expression. The genotypes which show the low infection efficiency and longer latent period were crossed (in the Institute of field and vegetable crops) with aim to reach the higher level of the resistance at last complete. It is known that in Yugoslavia only genes Lr 9, 19 and 24 single provide the stable hypersensitive resistance to many isolates in greenhouse and to population in field for many years. They were never widespread in production. Complementary effect of the genes for the resistance is also well-known and used in these region. The further studies were done with aim to distinguish the pleiotropic from one way effects of the genes for different resistances (hypersensitive-specific and partial-nonspecific). The result are varieties with satisfactory level of the resistance to Puccinia recondita tritici (sometimes some of them occupied 20% of in the Yugoslavia by wheat covered area), for eight or more years, without cases of predictable and proved overcoming in particular region.