Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: June 20, 2004
Publication Date: August 13, 2004
Citation: Yan, W., Rutger, J.N., Bockelman, H.E., Tai, T. 2004. Development of a core collection from the USDA rice germplasm collection. In: Norman, R.J., Meullenet, J.-F., Moldenhauer, K.A.K., editors. B.R. Wells Rice Research Studies 2003, Arkansas Agricultural Experiment Station Research Series 517. p. 88-96. Available: http://www.uark.edu/depts/agripub/Publications/researchseries/ Technical Abstract: Development of a core collection is a strategy that increases the efficiency of germplasm evaluation and management. The United States Department of Agriculture (USDA) rice core collection is identified in the Germplasm Resources Information Network (GRIN), and was assembled by a stratified random sampling method. This core of 1,801 accessions from 115 countries or sources represents approximately 10% of 17,396 rice accessions in the National Small Grains Collection (NSGC), and is expected to represent over 70% of the total variation in the NSGC collection. China, the Philippines and Japan were ranked the top contributors each with 69 or more sampled entries. From 11 to 30 entries were sampled for 48 countries. Only one entry was sampled from each of 21 countries. Complete or 100% sampling of germplasm in the NSGC collection was made for 38 countries. The cultivated species Oryza sativa is nearly 99% of the core collection, with the remaining accessions representing the other 10 species of Oryza in the NSGC collection. The sampling was made from historical to modern germplasm with a slight emphasis on the modern. A comprehensive evaluation including DNA analysis with molecular markers will be conducted by a joint federal and state effort, and the data will be displayed in GRIN.