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Title:   Author  item
                                            Yan, Wenguiitem
                                            Rutger, Jitem
                                            Bockelman, Harolditem
                                            Tai, Thomas
  Submitted to: American Society of Agronomy Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/28/2003
                                    Publication  Date: 11/2/2003
                                    Citation: Yan, W., Rutger, J.N., Bockelman, H.E., Tai, T. 2003. Comparison of agronomic traits between the USDA-ARS rice collection and a core subset [abstract]. Annual Meeting Abstracts 2003. American Society of Agronomy. p. 229.Interpretive Summary: Abstract only - interpretive summary not required.
                                Technical Abstract: To be useful a core subset must contain most of the genetic diversity of the whole collection. A core collection of 1,687 accessions, about 10% of the USDA-ARS 17,359 accessions, was constructed. Data on the core from 2002 field evaluations and the whole from GRIN (Germplasm Resources Information Network) were analyzed for similarity. Days from emergence to heading ranged from 38 to 182 and averaged 97 ± 19 days in the core, while the whole ranged from 37 to183, with an average of 103 ± 20 days. Plant height ranged from 61 to 212 and averaged 126 ± 25 cm in the core, while the whole ranged from 41 to 208, with an average of 118 ± 26 cm. The core was 81% awnless, 5% short and part awns, 5% long and part awns, and 9% long and full awns, while the whole was 62%, 26%, 5%, and 7%, respectively. There were 41% erect plant type, 35% intermediate, 21% open and 3% spreading in the core, and 14%, 32%, 49% and 5%, respectively in the whole collection. Panicle type of the core collection was 1% erect, 97% open and 2% spreading, while in the whole collection, 3% were erect, 89% open and 8% spreading. It was concluded that this core subset contained most of the genetic diversity in the whole collection in terms of agronomic traits


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