Estimates of genetic parameters and selection methods for genetic improvement of Pinus oocarpa Schiede

Abstract

This work aimed to study the genetic variability within and between provenances and progenies and to determine the genetic gain related to timber volume, in Pinus oocarpa. The experiment was carried up in Angatuba, São Paulo, Brazil, in a compact family block design, with nine replications and six plant plots. The results of seven provenances showed a production of 0.296 m³ of timber per tree at nine years-old. To establish seedling seed orchard, 189 trees with the greatest genetic gain in diameter at breast height (27 trees per provenance) were selected. The selection of these trees will allow an increase in the current volumetric timber production, reaching 0.327 m³ per tree (individual selection), 0.338 m³ per tree (combined selection) and 0.341 m³ per tree (multi-effect index). To implement a clonal seed orchard, 28 trees with the greatest genetic gain in diameter at breast height (four trees per provenance) were selected. The selection of these trees will allow an increase in the current volumetric timber production, reaching 0.345 m³ per tree (individual selection), 0.355 m³ per tree (combined selection) and 0.356 m³ per tree (multi-effect index).