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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References
Arias, G., L. Reiner, A. Penger & A. Mangst, 1983. Directory of Barley Cultivars and Lines. E. Ulmer, Stuttgart.
Breese, E.L., 1989. Regeneration and multiplication of germplasm resources in seed genebanks:the scientific background. International Board for Plant Genetic Resources, Rome, Italy, 69p.
FAO, 1993. Data from the FAO world Information and Early Warning System on Plant Genetic Resources.
Frese, L. & Th. J. L. van Hintum, 1989. The International Data Base for Beta. In: International Crop Networks Series. 3. Report of an International Workshop on Beta Genetic Resources, IBPGR, Rome. pp. 17–45.
Hintum, Th. J. L. van, 1989. GENIS: A fourth generation information system for the database management of genebanks. Plant Genetic Resources Newsletter 75/76: 13–15.
Hintum, Th. J. L. van & D. L. Visser, 1994. Duplication within and between germplasm collections. II Duplication in fourEuropean barley collections. Genetic Resources and Crop Evolution 42: 135–145.
IBPGR, 1992. Descriptors for white clover (Trifolium repens L.). International Board for Plant Genetic Resources, Rome, Italy.
Kniipffer, H., 1988. The European Barley Database of the ECP/GR: an introduction. Kulturpflanze 36: 135–162.
Knüpffer, H., 1989. Identification of duplicates in the European Barley Database. In: Report of a Working Group on Barley (Third Meeting). IBPGR, Rome. pp. 22–43.
Lyman, J. M., 1984. Progress and planning for germplasm conservation of major food crops. FAO/IBPGR Plant Genetic Resources Newsletter 60: 3–21.
Nielsen, G. & H. Bay Johansen, 1986. Proposal for the identification of barley varieties based on the genotypes for 2 hordein and 39 isoenzyme loci of 47 reference varieties. Euphytica 35: 717–728.
Plucknett, D.L., N. J. H. Smith, J. T. Williams & N. Murthi Anishetty, 1987. Genebanks and the world's food. Princeton University Press, Princeton, New Jersey.
Sahu, R. K., 1989. Screening for duplicates in the germplasm collection. International Rice Research Newsletter 14: 4.
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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