Early selection in open‑pollinated Eucalyptus families based on competition covariates

Authors

  • Bruno Ettore Pavan Universidade Estadual Paulista Júlio de Mesquita Filho (Unesp), Faculdade de Engenharia de Ilha Solteira
  • Rinaldo César de Paula Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Produção Vegetal
  • Dilermando Perecin Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Produção Vegetal
  • Edimar Aparecido Scarpinati Arbogen Tecnologia Florestal
  • Liliam Silvia Candido Universidade Federal da Grande Dourados, Faculdade de Ciências Biológicas e Ambientais

DOI:

https://doi.org/10.1590/S1678-3921.pab2014.v49.18777

Keywords:

Eucalyptus, intergenotypic competition, progeny tests, selection methods

Abstract

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.

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Published

2014-07-25

How to Cite

Pavan, B. E., Paula, R. C. de, Perecin, D., Scarpinati, E. A., & Candido, L. S. (2014). Early selection in open‑pollinated <i>Eucalyptus</i> families based on competition covariates. Pesquisa Agropecuaria Brasileira, 49(6), 483–492. https://doi.org/10.1590/S1678-3921.pab2014.v49.18777

Issue

Section

GENETICS