Avaliação da influência do caráter lignotúber sobre características silviculturais em testes de progênies de Eucalyptus spp

• Ano de defesa: 2015
• Autor(a) principal: Arneiro, Lidia Carolina Meira [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Eucalipto - Crescimento; Melhoramento genetico; Tuberculo (Botanica); Sistemas silviculturais; Crescimento (Plantas); Tubers; Breeding
• Link de acesso: http://hdl.handle.net/11449/139340; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/13-05-2016/000863925.pdf

Brazil stands out in the forest sector by the development and production of species with economic interests. In partnership with forestry companies, the University of Sao Paulo State (UNESP- Botucatu) has been developing studies to identifying traits related to abiotic stress in Eucalyptus. The presence of lignotuber is a character that gives to these species tolerance to different levels of stress. Our aim was to understand the relationship of lignotuber with stress and silvicultural characteristics by estimating the genetic parameters and phenotypic correlations. Experiments were conducted with two eucalyptus species and their hybrids in two contrasting environments as the edaphoclimatic aspects. We evaluated two characters of growth: height (ALT), circumference at breast height (CAP) and presence of lignotuber. The estimation of the genetic parameters did not detect heterosis and epistasis in these materials. Joint analysis of the experiments indicated significance for the treatments, as for the presence of lignotubercle. Thus, the phenotypic correlation was significant, indicating that in the presence of biotic/abiotic stress, exist association between silvicultural traits and the presence of lignotuber. Plants with this structure showed less vegetative growth. These results show that the lignotuber is an important structure in plants and an important factor to be considered in choosing genotypes for regions where stress is high