GENETIC VARIABILITY IN GROWTH OF SELECTED PROGENIES OF Pinus radiata
DOI:
https://doi.org/10.5902/198050981921Keywords:
Pinus radiata, intra-class genetic correlation, heritability, cuttings.Abstract
Narrow sense heritability (h2), intra-class genetic correlations (G2IC) and variance components for height, diameter at breast height and stem volume of seven-year-old trees were investigated. Two progeny trials of Pinus radiata were planted in southern Chile and growth data obtained to estimate genetic variability. These trials included trees from vegetative and generative propagation. Generative propagated trees were used to estimate the heritability, which indicated the following values: height, 0.08-0.13; stem diameter, 0-0.13; stem volume, 0-0.09. Estimates of intra-class genetic correlations among groups of trees from vegetative propagation were moderate to low (G2IC at 7 years of age: height, 0.1-0.11; stem diameter, 0.01-0.05; stem volume, 0.03-0.06). The relatively limited variation between trees groups was expected, reflecting the strong selection applied. In general, trees from cuttings displayed a tendency to have a smaller intra-genotypic variation, and a greater among groups variances (s2g) than family variances (s2f), in four out of six traits evaluated. This indicated a tendency for a greater homogeneity in growth, as is common in vegetatively propagated plants.
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