Tjl. Vanhintum et Dl. Visser, DUPLICATION WITHIN AND BETWEEN GERMPLASM COLLECTIONS .2. DUPLICATION IN 4 EUROPEAN BARLEY COLLECTIONS, Genetic resources and crop evolution, 42(2), 1995, pp. 135-145
The extent of duplication within and between barley genebank collectio
ns has been determined from a comparative analysis of four European ba
rley collections. These collections were those of the Centre for Genet
ic Resources, the Netherlands, the Institute of Plant Genetics and Cro
p Plant Research and the Braunschweig Genetic Resources Centre, both i
n Germany, and finally that of the John Innes Institute in the United
Kingdom. These collections comprise over thirty thousand accessions. A
random set of 100 accessions from the CGN barley collections was matc
hed with all four collections to identify probable duplication, result
ing in 61% of the accessions being matched. Passport data were used to
identify probable duplicates. This was hindered by the low quality of
these data; simple perfect matches were rare. The probable duplicatio
n, excluding parental duplication, involved 144 other accessions. Usin
g seed traits, field observations and electrophoretic markers, it coul
d be shown that more than three quarters of the matched accessions in
the random set, excluding parental duplication, were completely duplic
ated in the others and one fifth were more or less duplicated in other
matched accessions. If individual comparisons between accessions from
the random set and the matched accessions were made, about one fifth
of the probable duplicates were shown not to be duplicates at all. One
half were identical duplicates, and the rest were common or partial d
uplicates.