Data/hora: 02/06/2024 02:36:51

Provedor de dados: | 86
País: | Brazil
Título: | Early selection in open-pollinated Eucalyptus families based on competition covariates
Autores: | Pavan,Bruno Ettore; Paula,Rinaldo César de; Perecin,Dilermando; Scarpinati,Edimar Aparecido; Candido,Liliam Silvia.
Data: | 2014-06-01
Ano: | 2014
Palavras-chave: | Eucalyptus; Intergenotypic competition; Progeny tests; Selection methods.
Resumo: | The objetive of this work was to evaluate the influence of intergenotypic competition in open-pollinated families of Eucalyptus and its effects on early selection efficiency. Two experiments were carried out, in which the timber volume was evaluated at three ages, in a randomized complete block design. Data from the three years of evaluation (experiment 1, at 2, 4, and 7 years; and experiment 2, at 2, 5, and 7 years) were analyzed using mixed models. The following were estimated: variance components, genetic parameters, selection gains, effective number, early selection efficiency, selection gain per unit time, and coincidence of selection with and without the use of competition covariates. Competition effect was nonsignificant for ages under three years, and adjustment using competition covariates was unnecessary. Early selection for families is effective; families that have a late growth spurt are more vulnerable to competition, which markedly impairs ranking at the end of the cycle. Early selection is efficient according to all adopted criteria, and the age of around three years is the most recommended, given the high efficiency and accuracy rate in the indication of trees and families. The addition of competition covariates at the end of the cycle improves early selection efficiency for almost all studied criteria.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000600483

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2014000600010
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.49 n.6 2014
Fonte: | info:eu-repo/semantics/openAccess