Accumulation of genes for enhancement of incomplete resistance to Puccinia recondita tritici

Abstract

Results of breeding for the resistance altered according to possibilities, mostly connected with choice of the resistant parents (alien species, resistant varieties out of production and fortunately very often widespread varieties). Pyramiding, or accumulating genes for the specific resistance was not successful because of practical reasons: how to select in progenies and to keep all genes from the initial parents? Transmission of genes from alien species, mostly causes expression of negative characteristics controlled by linked genes. Determination and transmission of genes in the interaction until now is most successful from the aspect of durability and long term protection level. Nowadays results suggest the more accurate way: combination of the parents with high level of incomplete resistance to increase that characteristics or to get the complete resistance to the present population of pathogen. It agrees with the most important point in breeding for the resistance: durability. High level of incomplete resistance is sufficient to avoid epidemics development of pathogens specially in semiarid regions.