Tjl. Vanhintum et H. Knupffer, DUPLICATION WITHIN AND BETWEEN GERMPLASM COLLECTIONS .1. IDENTIFYING DUPLICATION ON THE BASIS OF PASSPORT DATA, Genetic resources and crop evolution, 42(2), 1995, pp. 127-133
Principles of duplication within and between genebank collections have
been explored, terminology is proposed and the difficulties in identi
fying probable duplication are discussed. Identical duplication concer
ns genetically identical accessions, whereas common duplication refers
to accessions derived from the same original population that are mixt
ures of lines with differing genotype frequencies, or random mating po
pulations with the same alleles but differing allele frequencies. Part
ial and compound duplication are types of incomplete duplication. An a
dditional type of duplication is the relation between the parents in a
cross and their offspring, i.e. parental duplication. Identifying pro
bable duplication on the basis of passport data is often hindered by t
heir incompleteness or poor quality. The genetic identity of accession
s is also subject to changes during maintenance in genebanks. Therefor
e, probable duplicates will often not be true duplicates. Examples fro
m the European Barley Database illustrate the problems.