Estimation of genetic parameters using spatial analysis of Pinus elliottii Engelm. var. elliottii second-generation progeny trials in Argentina

Authors
Belaber, Ector C.; Gauchat, Maria Elena; Rodriguez, Gustavo Hernan; Borralho, Nuno M.; Cappa, Eduardo Pablo
Publication Year
2018
Language
English
Format
article
Status
Published version
Description
Non-spatial and spatial analyses were carried out to estimate genetic parameters for growth and stem straightness traits between ages 4 and 7 in two series of eight progeny trials of Pinus elliottii Engelm. var. elliottii (PEE) established in 2004 and 2008, comprising 429 open-pollinated families from Instituto Nacional de Tecnología Agropecuaria (INTA) tree breeding population in Argentina. A first-order autoregressive spatial mixed model was found to significantly improve the fit of the model, compared with the standard non-spatial mixed model approach, due to substantial spatial heterogeneity within sites. The average individual-tree narrow-sense heritability estimates based on this spatial analysis were 0.49 for diameter at breast height, 0.36 for total height, and 0.48 for volume, with stem straightness being low to moderate (average = 0.11). The additive genetic correlation estimates between growth traits were positive (0.51 ≤  r^a  ≤ 0.99) and statistically significant from zero. In contrast, the genetic correlations between growth traits and stem straightness although in general also positive were not significantly different from zero (− 0.22 ≤  r^a  ≤ 0.59). Age-to-age genetic correlations were consistently higher for growth traits ( r^a  ≥ 0.81) than for stem straightness ( r^a  ≥ 0.33). The average additive genetic correlation estimated between sites within test series was high for all traits evaluated (average > 0.72). In contrast, average additive genetic correlation estimated between sites across series was slightly lower (average < 0.63). Implications of all these parameter estimates for genetic improvement of PEE in Argentina are discussed.
EEA Montecarlo
Fil: Belaber, Ector C. INTA. Estación Experimental Agropecuaria Montecarlo; Argentina
Fil: Gauchat, Maria Elena. INTA. Estación Experimental Agropecuaria Montecarlo; Argentina
Fil: Rodriguez, Gustavo Hernan. INTA. Estación Experimental Agropecuaria Montecarlo; Argentina
Fil: Borralho, Nuno M. Cartaxo; Portugal. Universidade Técnica de Lisboa. Instituto Superior de Agronomia. Centro de Estudos Florestais; Portugal
Fil: Cappa, Eduardo Pablo. INTA. Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Source
New Forests : 1–23 (September 2018)
Subject
Pinus elliottii
Parámetros Genéticos
Pruebas de Descendencia
Distribución Espacial
Fitomejoramiento
Genetic Parameters
Progeny Testing
Spatial Distribution
Plant Breeding
Argentina
Access level
Restricted access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/3307