Data/hora: 07/06/2024 11:42:23

Biblioteca(s): 	Embrapa Agropecuária Oeste.	
Data corrente: 	30/07/2004	
Data da última atualização: 	30/07/2004	
Autoria: 	CARTER JUNIOR, T. E.; GIZLICE, Z.; BURTON, J. W.	
Título: 	Coefficient-of-parantage and genetic-similarity estimates for 258 North American soybean cultivars released by public agencies during 1945-88.	
Ano de publicação: 	1993	
Fonte/Imprenta: 	[S.l.]: USDA-ARS, 1993.	
Páginas: 	169 p.	
Série: 	(USDA-ARS.Technical Bulletin, 1814).	
Idioma: 	Inglês	
Conteúdo: 	This report is a catalog of genetic relations among 258 soybean cultivars released by public agencies during 1945-88. Its purpose is to provide soybean breeders with a practical guide for the selection of good parental material and for the preservation of genetic diversity in their breeding programs. To develop this guide, we used pedigree analysis, a common technique in plant breeding. Based on the concept of allelic identity by descent, this approach uses the familial relationships among cultivars to quantify the probability of two cultivars having identical genes at a random locus. This probability is known as the coefficient of parentage. The calculation of coefficient of parentage requires some assumptions regarding relations among the ancestors of modern soybean cultivars. Because these assumptions have some potential for altering the interpretation of our results, we present two estimates of genetic relatedness of soybean cultivars, using different assumptions for calculation in each analysis. In the first analysis, we make the convertional assumption that the original plant introductions used in North American soybean breeding (those for which pedigrees are unknown) are all equally unrelated. In the secon, which we refer to as a genetic similarity analysis, we assume that patterns of relatedness do exist in this original founding stock. Gizlice (1991) compared phenotypes of 14 plant introductions that constitute 70% of the genetic material use in U.S. soybean breeding and also described patterns of diversity within this group. We superimposed this information on the conventional pedigree analysis to obtain genetic-similarity estimates for the 258 cultivars. As an additional measure of diversity in soybean, we also present the coefficient of parentage between the cultivars mentioned and 50 major ancestors of the modern soybean. Our results summarize the complicated pedigrees in a simple way so that breeders can easily determine the genetic diversity of the material in their program.	
Palavras-Chave: 	América do Norte; Cultivar; Diversidade genética; EUA.	
Thesagro: 	Glycine Max; Melhoramento; Soja.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agropecuária Oeste (CPAO)	
Exemplares: 	CPAO - (22022-1) - ADP - LV - -- - 633.343 - C323c - 93.00145 - DIS