ARTÍCULO
TITULO

Combining genetic gain and diversity under an individual selection method in a selected provenance of Eucalyptus cladocalyx.

Freddy Mora    
Javier Saavedra    

Resumen

Flowering traits are becoming important breeding objectives in Eucalyptus cladocalyx. Previous studies have confirmed that the trees from Cowell, Australia, respond well for early flowering under the arid conditions in the Southern Atacama Desert, Chile. This selected population was evaluated for flowering intensity at the end of the flowering season of 2009/2010 (February 2010). A Bayesian threshold tree model via Gibbs sampling was used in the data analyses. The model included the genotype-environment interaction (two sites) using a bi-character threshold model. The posterior mean of the genetic correlation between the sites was positive and high (r=0.8) and, according to the 95% credible interval (0.44?0.96), it was significantly different from zero, indicating a non-significant interaction. The intensity of selection should be close to 11% to balance the gain and diversity after the individual tree selection in this breeding population. Los componentes de florecimiento representan un importante criterio de selección en Eucalyptus cladocalyx. Estudios previos han confirmado que los árboles procedentes de Cowell, Australia, florecen precozmente bajo condiciones áridas del sur del Desierto de Atacama, Chile. Esta población seleccionada se evaluó en función de intensidad de florecimiento al final de la estación de florecimiento 2009/2010 (Febrero de 2010). Los datos se analizaron mediante un modelo umbral bayesiano vía algoritmo de Gibbs. El modelo incluyó la interacción genotipoambiente (en dos sitios) mediante un modelo umbral bi-caracter. La media a posteriori de la correlación genética entre sitios fue positiva y alta (r=0,8) y de acuerdo al del intervalo de credibilidad (0,44?0,96), 95% de probabilidad, ésta fue significativamente distinta de cero, indicando una interacción no significativa. La intensidad de selección debiese ser cercana al 11% para balancear ganancia y diversidad genética, que se obtiene posterior a la selección de árboles individuales en esta población de mejoramiento.

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