Abstract
Pinus greggii has potential for inclusion in temperate zone breeding programs around the world as it is frost resistant and produces high yields for pulp production. This study estimates the genetic parameters for two P. greggii progeny tests established in Telêmaco Borba, Paraná, Brazil. We evaluated diameter at breast height (DBH) and total height (H) at seven and nine years of age. The narrow-sense heritability ( h i 2 ) ranged from 0.225 (H, 7 years) to 0.515 (H, 9 years). The genetic correlation was high for all traits, reaching up to 0.91 between traits and 0.94 between ages. In addition, the results show the presence of Genotype x Environment interaction, and as such, the most productive and stable progeny were identified based on the Harmonic Mean of the Relative Performance of Genetic Values (MHPRVG) values. These population has genetic materials that are superior in terms of both DBH and H compared to the control and to P. greggii materials analyzed internationally. Our results contribute to the literature by providing further genetic information on this species, while also demonstrating the implications of thinning for genetic gains and effective population size.
Highlights
Worldwide, the development of the forestry sector has relied heavily on Pinus L. making it one of the most commonly planted exotic genera
In PGII, diameter at breast height (DBH) at seven years showed significance at 1% probability, while the other traits and ages were significant at 0.1% for progeny effect
The P. greggii progeny tests established in Telêmaco Borba, Paraná, Brazil, showed enough genetic diversity for the development of a breeding program, new genetic material is needed to further increase the genetic variance
Summary
The development of the forestry sector has relied heavily on Pinus L. making it one of the most commonly planted exotic genera. The most frequently used Pinus species for forestry are Pinus taeda L. and Pinus elliotti Engelm. With the rapid expansion of the industrial sector and increasing demand for new materials, there is a need to diversify the species offered and provide alternatives to meet supply demands with better quality feedstock. This diversification must attend to the needs of industry, including offering better quality wood properties, while guaranteeing resistance to pests, disease, and adverse conditions. One species that offers such favorable characteristics and requires further study is Pinus greggii Engelm (Shimizu 2008). The soils where the species occur are deep and slightly
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