Seleção de progênies de Myracrodruon urundeuva (F.F. & M.F. Allemão) baseada em caracteres fenológicos e de crescimento para reconstituição de áreas de reserva legal

• Ano de defesa: 2015
• Autor(a) principal: Bertonha, Laerte João [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Plantas - Melhoramento genetico; Áreas protegidas; Reflorestamento; Sustentabilidade; Plant-breeding
• Link de acesso: http://hdl.handle.net/11449/124454; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/19-06-2015/000835170.pdf

Reforestation with native tree species of legal reserve areas is a way to attend the legal requirement. This activity can be combined with the use of genetically improved native species, increasing the sustainable use of the property and, consequently, encouraging rural landowners to recovery such areas. This paper discusses some methodologies of recovery of degraded areas with Myracrodruon urundeuva, with guidelines on how to obtain seeds with certain stage of genetic improvement. The aim is to convert two planting systems of the species, conserved ex situ, in seed orchards. Therefore, we evaluated the sex ratio, genetic variation of traits diameter at breast height (DBH), total height (TH), canopy insertion height (CI), canopy height (CH), average canopy diameter (ACD), canopy volume (CV) and the production of diaspores in two tests of progenies (planting systems) with 16.5 years-old, planted in the Teaching, Research and Extention Farm (TREF), of the Faculty of Ilha Solteira - UNESP, in Selvíria (MS). We estimated genetic parameters such as heritability and gains in selection for the traits using the linear mixed model with REML/BLUP. The evaluation of diaspores production was done in eight female plants of intercalated planting system, with correlation between CV and the production of diaspores represented by the regression equation y = 0,0199x + 0.0496. In both planting systems of Myracrodruon urundeuva, the sex ratio of males and females was approximately 5:1. In the two planting systems we selected the best 45 male plants and the best nine female plants, for DAP character, with genetic gain of 11.1% in the homogenous planting system and 24.3% in the intercalated planting system. The results validate the proposed improvement of this species and any of the selected planting system can be successfully used in the production of seeds for recomposition of legal reserve. The method can also be adapted to other species