Genetic parameters of growth and survival in Acacia saligna shrubs

Abstract

F. Mora, S. Perret, C.A. Scapim, and E. Arnhold. 2010. Genetic parameters for growth and survival in Acacia saligna shrubs. Cien. Inv. Agr. 37(2):5-14. Acacia species have valuable agronomic characteristics, such as the tolerance to unfavorable environmental conditions. In this study, genetic parameters and selection response in Acacia saligna shrubs were investigated in two arid environments of northern Chile: Cuz-Cuz and El Tangue. The quantitative traits were assessed in 5 year-old shrubs. A Bayesian approach, implemented using Gibbs sampling algorithm, was used in the data analysis. The tree survival was 87.3% and 81.8% in CuzCuz and El Tangue, respectively, confirming the potential of A. saligna in northern Chile. The estimates of posterior mode of the heritability ranged from h2=0.13 (survival) to h2=0.25 (shrub crown diameter). Estimated genetic gain (individual tree selection) ranged from 6 to 14% (selection intensity of 20%). Bayesian credible intervals (p=95%) for genotype-environment correlations included zero, indicating a significant interaction for survival, crown diameter and height. Shrub selection in multipurpose planting will depend on optimizing economical traits by selecting genotypes that perform well on a particular environment.

Supervivencia y crecimiento inicial de subespecies y procedencias de Acacia saligna (Labill.) H.L. Wendl en el secano de la Región del Maule, Chile

“…La evidencia de interacción genotipo ambiente es coincidente con lo indicado por Mora et al (2010), quienes en una evaluación cuantitativa específica efectuada a los cinco años de edad en dos ensayos de progenie-procedencia de A. saligna establecidos en el norte chico, concluyen la existencia de una significativa interacción para las características de supervivencia, diámetro de copa y altura.…”

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

“…and are the additive variances for each environment. An r value close to 1 indicates a negligible genotype-environment interaction, whereas a low r value (not significantly different from zero) indicates the significant presence of a genotype-environment interaction, and the ranking can be different in each site (Sykes et al, 2006;Mora et al, 2010).…”