8th INTERNATIONAL WHEAT CONFERENCE

esistance genes, such as Lr16+ (141/00i-1), Lr10, Lr26, Lr44++ (149/00i), Lr1+, Lr25+,
Lr44+ (122/00i-2), the resistance in such genotypes was probably determined by additional
unidentified genes.
The regularity was established of the frequency of some Lr genes inferred from the donor
species. The presence of effective Lr9 and Lr24 genes in the samples of collection are connected
with genetic material of T. kiharae, Lr19 gene with Ae. speltoides species. The genes
Lr39 and Lr46 were revealed more frequently in samples with genetic material of Ae. triuncialis.
The rare Lr50 gene in wheat was revealed in a sample having complex pedigree
and containing genetic material of wheat, Ae. speltoides and S. cereale (100/1-06).
A number of regularities were fixed that determine resistance of wheat samples with alien
genetic material to leaf rust, such as:
Polygenic control of resistance;
Presence of lr9, lr24, lr27+31, lr35, lr37, lr50, lr46 genes, effective for the non-chernozem
zone;
Combination of juvenile genes of resistance with the genes of adult plants and slow
rusting gene (lr46);
Rare combination of lr genes.
The ear productivity, weight of 1000 seeds and grain quality characteristics of the accessions
(sedimentation level, protein and gluten content in grain, falling number) exceeded
those of cv. Rodina, which served as a reference for “Arsenal” collection, or were at the
same level with them. Concentration of leaf rust resistance genes including the effective
ones in the donor genotypes, rare gene combinations and high level of economically valuable
features determine the possibility of their wide use in immunity breeding programs
in the following directions:
In breeding programs for immunity in regions when identified genes are effective;
For resuscitation of highly productive cultivars that had served their time due to loss
of resistance to leaf rust;
For pyramiding genes of resistance in genotype of elite cultivars;
In alternative breeding programs for the development of new cultivars.
This work was supported by the International Science and Technology Center (Project
no. 3352).
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