U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Dale Bumpers National Rice Research Center: Stuttgart, AR
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Southeast Area Stuttgart, Arkansas Dale Bumpers National Rice Research Center Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Yan, Wenguiitem
                                            Rutger, Jitem
                                            Bockelman, Harolditem
                                            Tai, Thomas
  Submitted to: Meeting Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 3/5/2005
                                    Publication  Date: 4/25/2005
                                    Citation: Yan, W., Rutger, J.N., Bockelman, H.E., Tai, T. 2005. Usda rice core collection and its genetic assessment. In: Proceedings of International Symposium on Genetic-based Plant Germplasm Research, April 25-28, 2005, Beijing, China. p. 9-17.Interpretive Summary:
                                Technical Abstract: Working with 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 1,794 accessions from 114 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 20 countries. Complete or 100% sampling of germplasm in the NSGC collection was made for 37 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. Comprehensive evaluations, including phenotyping 28 descriptors and genotyping with 183 markers, are being conducted by a joint effort of federal and state institutions in the United States, and Chinese cooperators. All the results from both phenotyping and genotyping will be displayed in GRIN for the public.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov