Abstract
A core collection is a subset of a large germplasm collection that contains accessions chosen to represent the genetic variability of the germplasm collection. The purpose of the core collection is to improve management and use of a germplasm collection. Core collections are usually assembled by grouping accessions and selecting from within these groups. The objective of this study was to compare 11 methods of assembling a core collection of the U.S. National collection of annual Medicago species. These methods differed in their use of passport and evaluation data as well as their selection strategy. Another objective was to compare core collections with sample sizes of 5%, 10% and 17% of the germplasm collection. Core collections assembled with evaluation data and cluster analysis better represented the germplasm collection than core collections assembled based solely on passport data and random selection of accessions, The Relative Diversity and the logarithm methods generated better core collections than the proportional method. The 5% and 10% sample size core collection were judged insufficient to represent the germplasm collection.
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References
Brown AHD (1989a) The case for core collections. In: Brown AHD, Frankel OH, Marshall DR, Williams JT (eds) The use of plant genetic resources. Cambridge University Press, Cambridge, pp 136–156
Brown AHD (1989b) Core collection: a practical approach to genetic resources management. Genome 31:818–824
Brown AHD, Grace JP, Speer SS (1987) Designation of a core collection of perennial Glycine. Soybean Genet Newsl 14:59–17
Diwan N, Bauchan GR, McIntosh MS (1994) A core collection for the United States annual Medicago germplasm collection. Crop Sci 34:279–285
Frankel OH (1984) Genetic perspective of germplasm conservation. In: Arber WK, Llimensee K, Peacock WJ, Stalinger P (eds) Genetic manipulation: impact on man and society. Cambridge University Press, Cambridge, pp 161–170
Hamon S, van Sloten DH (1989) Characterization and evaluation of okra. In: Brown AD, Frankel OH, Marshall DR, Williams J (eds) The use of plant genetic resources. Cambridge University Press, Cambridge, pp 173–196
Hodgkin T (1990) The core collection concept. In: van Hintum TJL, Frese L, Perret PM (eds) Crop networks: searching for new concepts for colaborative genetic resources management. International Board for Plant Genetic Resources, Rome, Italy, pp 43–48
Holbrook CC, Annderson WF, Pittman RN (1993) Selection of a core collection from the U.S. germplasm collection of peanuts. Crop Sci 33:859–861
Holden JHW (1984) The second ten years. In: Holden JHW, Williams J (eds) Crop genetic resources: conservation and evaluation. George Allen and Unwin, London, UK, pp 277–285
Jacobs D (1990) SAS/Graph software and numerical taxonomy. In: Proc of 15th Annu SAS Users Group. International Conference, SAS Institute, Cary, N.C. pp 1413–1418
Mackay MC (1986) Ultilizing wheat genetic resources in Australia. In: McLean R (ed) Proc 5th Assembly Wheat Breed Soc Australia. Perth/Merredin, Australia, pp 56–61
Mackay MC (1989) Strategic planning for effective evaluation of plant germplasm. In: Strivastava JP, Damania AB (eds) Wheat Genetic Resources: Meeting Diverse Needs. John Wiley & Sons Ltd. Chichester, England, pp 21–25
SAS Institute (1989) SAS/STAT user's guide version 6, 4th edn. SAS Institute Inc, Cary, N.C.
Schoen DJ, Brown AHD (1994) Conservation of allelic richness in wild crop relatives is aided by assessment of genetic markers. Proc Natl Acad Sci USA 90:10623–10627
US Department of Agriculture (1989) Germplasm resources information network user's manual. Beltsville Agriculture Research Center, Beltsville, M.D.
Williams TJ (1991) Plant genetic resources: some new directions. Advan Agron 45:61–91
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Communicated by P. M. A. Tigerstedt
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Diwan, N., McIntosh, M.S. & Bauchan, G.R. Methods of developing a core collection of annual Medicago species. Theoret. Appl. Genetics 90, 755–761 (1995). https://doi.org/10.1007/BF00222008
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DOI: https://doi.org/10.1007/BF00222008