Data/hora: 10/06/2024 09:25:10

Provedor de dados: 	64	
País: 	Brazil	
Título: 	Sample size for family evaluation in potato breeding programs	
Autores: 	Diniz,Maria Cristina Duarte Rios; Pinto,César Augusto Brasil Pereira; Lambert,Eduardo de Souza.	
Data: 	2006-04-01	
Ano: 	2006	
Palavras-chave: 	Family size; Family selection; Genetic variance; Solanum tuberosum L.	
Resumo: 	Clonal families from a broad genetic base population in the Potato Breeding Program at the Universidade Federal de Lavras (UFLA), Brazil, were used in this trials. Twenty-five families were assessed in a 5 x 5 triple lattice design. Each plot consisted of 30 clones distributed in three rows of ten plants. Tuber yield per plant, percentage of large tubers, mean weight of large tubers, mean medium-sized tuber weight and tuber specific gravity were measured. Three hundred experiments were simulated varying the family sizes from three to 90 clones. The coefficients of experimental variation (CVe), the coefficients of genetic variation (CVg), heritabilities for family mean and the CVg/CVe ratio were estimated. Genetic parameters were stabilized with family sizes as small as six clones, depending on the trait. This indicates that the families can be adequately represented by a small sample of clones. Using the maximum curvature method it is possible to conclude that approximately 30 clones would be sufficient to represent each family, even for traits with the highest CVe. The genetic variance within family was greater than the genetic variance among families for all traits, indicating a favorable potential for within family selection. The correlation coefficients of the family means with the 5%, 10%, 15% and 20% best clones from each family, considering the five traits assessed, were always high, meaning that within the best families generally are the best clones.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542006000200013	
Editor: 	Editora da Universidade Federal de Lavras	
Relação: 	10.1590/S1413-70542006000200013	
Formato: 	text/html	
Fonte: 	Ciência e Agrotecnologia  v.30 n.2 2006	
Fonte: 	info:eu-repo/semantics/openAccess