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Title:   Author  item
                                            YAN, WENGUI - 6225-05-00item
                                            Rutger, Jitem
                                            Bockelman, Harolditem
                                            Tai, Thomas
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/31/2002
                                    Publication  Date: 10/28/2002
                                    Citation: Yan, W., Rutger, J.N., Bockelman, H.E., Tai, T. 2002. Establishing a core collection for comprehensive evaluation of US rice germplasm. ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 10-14, 2002. Indianapolis, IN: pg. 237.Interpretive Summary: jj
                                Technical Abstract: The core subset strategy should increase efficiency in germplasm evaluation and management.  A rice core subset was established by the stratified random sampling method: 1) recording the number of accessions from each country of origin; 2) calculating the logarithm (log) of the number of accessions from each country; 3) randomly choosing the accessions within each country based on the relative log number, with a minimum of one accession per country; and 4) removing duplications.  This core collection has 1,687 accessions coming from 106 countries, and is about 10% of the whole U.S. rice collection of 17,359 accessions.  Theoretically, the core subset should represent over 70% of the genetic diversity in the collection.  Seed stocks of the core are being prepared for comprehensive evaluation of characters for agronomic performance, morphology, grain quality, disease and insect resistance, stress tolerance, and DNA patterns for molecular marker analysis.  An information network containing all the data from the evaluation will be a subset in the GRIN for rice research nationally and internationally.


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