Abstract
Background: The selection of superior genotypes and adapted to the edaphoclimatic conditions of the region of the introduction produces gains in productivity for forest stands. The objective of this study was to select progenies of Pinus spp. planted in Lavras, Minas Gerais (MG), Brazil. Methods: The experimental site was located on dystrophic Haplic Cambisol. The progeny test was designed as a randomised complete block with 30 replicates and single plot. The treatments corresponded to one progeny of Pinus massoniana, three Pinus caribaea var. bahamensis and 33 Pinus caribaea var. hondurensis arranged with a 3x3 m spacing. The traits height (H), diameter at breast height (DBH) and crown projection area (CPA) were measured at 36 months of age. Results: The results showed that heritability in the narrow sense was 0.24 for DBH, 0.27 for H and 0.50 for CPA. The DBH and H traits showed a high-magnitude positive correlation. The P7, P15, P27, P31 and P33 progenies showed better performance than the other progenies for the evaluated traits. Direct and indirect selection showed similar gains, which favors the use of indirect selection; i.e., when selecting progenies for DBH, progenies with better performance in H are also selected. Additionally, DBH may be used at advanced ages given the difficulty of measuring height. The progeny of Pinus caribaea var. hondurensis showed superior performance compared with Pinus caribaea var. bahamensis and Pinus massoniana for the region of Lavras, MG. Conclusions: This study suggests the possibility of expanding the production of Pinus caribaea var. hondurensis in the region of Lavras with progenies P7, P15, P27, P31 and P33, because in the initial assessments they showed greater adaptability to the edaphoclimatic conditions. Nevertheless, performing a future selection with the aim of evaluating resin production is recommended.
Highlights
The demand for timber products in Brazil and worldwide tends to increase with increasing population growth
This study suggests the possibility of expanding the production of Pinus caribaea var. hondurensis in the region of Lavras with progenies P7, P15, P27, P31 and P33, because in the initial assessments they showed greater adaptability to the edaphoclimatic conditions
The test consisted of 37 progenies, including 33 progenies of Pinus caribaea var. hondurensis (P1–P33), three progenies of Pinus caribaea var. bahamensis (FT1– FT3) and one progeny of Pinus massoniana (Fec) obtained from open-pollinated and phenotypically selected maternal trees located in commercial plantations of Resineves Agroflorestal Ltda., Itapeva, São Paulo, Brazil
Summary
The demand for timber products in Brazil and worldwide tends to increase with increasing population growth. The genus Pinus includes Pinus caribaea, a fastgrowing species that is tropical in origin and is used for wood production and, in particular, for resin extraction This species is among those most frequently used for homogeneous reforestation in various parts of the world due to its adaptability to diverse climates and the broad application/destination of its products, which have undergone genetic improvement over recent decades. These improvements include an increase in volumetric yield and in the yield of trees with straight trunks, fewer whorls and thicker branches, which maximise the industrial usefulness of the wood (Missio et al 2004, Shimizu 2008, Silva et al 2011). The objective of this study was to select progenies of Pinus spp. planted in Lavras, Minas Gerais (MG), Brazil
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