8th INTERNATIONAL WHEAT CONFERENCE

Studying of genetic basis of a variety with the help of construction of a genealogical profile
– set of original ancestors making a top of pedigree tree. The contributions of original
ancestors are estimated by summation of Wright’s path coefficients for every possible
ways connecting a considered variety with an ancestor.
Calculation of matrix of parentage coefficients for the given accession set. It enables
quantitatively to estimate genetic similarity of varieties and to measure genetic diversity
within and between groups of varieties. The cluster analysis of a matrix of coefficients of
parentage or indexes of similarity of genealogical profiles allows to form the specialized
core collections for major economic traits which combine quite sufficiently wide genetic
diversity with a limited size of collection.
Calculation of matrix of genealogical profiles for the given accession set. For each accession
and all given set the Shannon diversity indexes are calculated. With the help of
genealogical profiles it is possible to carry out the retrospective analysis of the breeding
programs, to investigate temporal and spatial dynamics of diversity for a cultivar set.
Search for the offspring of a given cultivar or several given cultivars in any lineages of the
pedigree.
Tracing of transmission of gene alleles or traits of resistance/susceptibility to various
stressors from the ancestors to descendants permits to find the sources of resistance in a
particular variety and in some cases to postulate resistance genes.
Construction and analysis of contingency tables – statistical estimation of independence
of qualitative attributes by the χ 2 –test and calculation of coefficients of association between
genes and/or qualitative attributes. It allows to investigate the connected genetic
diversity, for example, with the purpose of study of regularities of geographical distribution
of genes and to select most valuable alleles and their combinations for the particular
agroclimatic zone.
Thus, the passport database in the aggregate with the program of data processing in the
Information and Analytical System GRIS4.0 expands the accessible information about
initial material for breeding and genetic studying on wheat.
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