Schriften zu Genetischen Ressourcen - Genres

Molecular diversity studies in two large genebank collections of Vicia sativa L.
groups, which could only statistically be circumscribed by differences in frequencies
of dominant alleles in various parts of the area rather than by the presence of areaspecific
alleles. Here, we face the problem that no significant intra-specific grouping
can be done using the association coefficients. Based on Smirnov’s “originality index”
(SMIRNOV 1969, BAEV and PENEV 1995), we suggest a new approach to highlight the
structure of the intra-specific diversity of cultivated species stored ex situ (a more
detailed description is being prepared for publication). This approach estimates the
frequency of alleles in a given area and presumes that accessions originating from
the same area might be characterised by a set of common or rare alleles. Thus, in
each representation of accessions from the same area, the most common, special,
and deviating accessions could be recognised. Based on the Smirnov specifity index,
the genetic structure of the vetch collection of the VIR genebank was characterised.
It can provide a solid base for the optimisation of the genetic diversity of ex situ
collections and can be used to support of the efficiency of breeding programmes.
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