Summary
Principles of duplication within and between genebank collections have been explored, terminology is proposed and the difficulties in identifying probable duplication are discussed.
Identical duplication concerns genetically identical accessions, whereas common duplication refers to accessions derived from the same original population that are mixtures of lines with differing genotype frequencies, or random mating populations with the same alleles but differing allele frequencies. Partial and compound duplication are types of incomplete duplication. An additional type of duplication is the relation between the parents in a cross and their offspring, i.e. parental duplication.
Identifying probable duplication on the basis of passport data is often hindered by their incompleteness or poor quality. The genetic identity of accessions is also subject to changes during maintenance in genebanks. Therefore, probable duplicates will often not be true duplicates.
Examples from the European Barley Database illustrate the problems.
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van Hintum, T.J.L., Knüpffer, H. Duplication within and between germplasm collections. Genet Resour Crop Evol 42, 127–133 (1995). https://doi.org/10.1007/BF02539516
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DOI: https://doi.org/10.1007/BF02539516