Data/hora: 09/06/2024 09:34:40

Provedor de dados: 	75	
País: 	Brazil	
Título: 	Genetic parameter and correlation estimates of processing traits in half-sib progenies of tropical-adapted carrot germplasm	
Autores: 	Vieira,Jairo V; Silva,Giovani Olegario da; Boiteux,Leonardo S.	
Data: 	2012-03-01	
Ano: 	2012	
Palavras-chave: 	Daucus carota; Heritability; Genetic correlation; Path analysis; Root length.	
Resumo: 	The estimate of the genetic parameters associated with processing (fresh-cut) traits, including root length (RL), is crucial for carrot breeding programs in tropical areas. The cultivar Alvorada is an important germplasm due to its resistance to nematodes, leaf blight, heat-tolerance, and high carotenoid content. Seventy-four 'Alvorada' half-sib progenies were evaluated during the summer of 2005 in the Federal District, Brazil, in a randomized complete block design with three replications. Thirteen competitive plants in each block were randomly selected and evaluated and/or classified for RL and for number of leaves (NL), leaf length (LL), root tip type (RT), root mass (RW), crown shape (CS), root diameter (RD), and xylem diameter (XD). The Pearson's correlation coefficients and the heritability values were estimated for all traits. The path analysis was also used considering the RL trait as dependent variable. The heritability for RL ranged from 12 to 44%. For the other traits, the values ranged from 3% (RD) to 79% (LL). Phenotypic and genotypic correlations among all traits were low to intermediate. Path analysis indicated positive direct relationship between RL and RW, whereas RD and XD displayed negative direct effect on RL. Longer roots had narrow diameter and narrow XD. Recurrent selection based upon either half-sib or S1 families would be more effective than mass phenotypic recurrent selection in increasing RL and to develop populations expressing multiple desirable processing traits in tropical-adapted carrot germplasm.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000100002	
Editor: 	Associação Brasileira de Horticultura	
Relação: 	10.1590/S0102-05362012000100002	
Formato: 	text/html	
Fonte: 	Horticultura Brasileira  v.30 n.1 2012	
Fonte: 	info:eu-repo/semantics/openAccess