Variação genética e desempenho de progênies de Pinus caribaea var. hondurensis para produção de madeira e resina

• Ano de defesa: 2014
• Autor(a) principal: Santos, Wanderley dos [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Genetica vegetal; Genetica florestal; Plantas; Melhoramento genetico; Variação (Biologia); Plant-breeding
• Link de acesso: http://hdl.handle.net/11449/126298; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/10-08-2015/000843769.pdf

Pinus caribea var. hondurensis is a species of the genus Pinus which is very important to tropical regions. Its wood and resin are used in various niches of the forest sector. However, the supply of quality genetic seeds are produced by few private companies and public institutions, especially by those in the resin sector. The aim is to contribute to the advances in P. caribaea var. hondurensis breeding cycles. The purpose of this work was to verify the competition effect on the estimates of genetic parameter and gain of a P. caribaea var. hondurensis progeny trial for wood and resin production as well as to verify the correlation between these traits. The experiment was established in lattice design 10 x 10 (triple), 100 treatments (96 progeny of a clonal seed orchard and four commercial control of P. caribaea var. hondurensis), 10 plants by plot, spaced at 3 m x 3 m. At twelve years after planting the test plots was thinning which left six plants per plot. The total height, diameter at breast height and the resin production o fall remaining were measured at 27 years following the planting. Analysis of deviance, genetic parameter estimates, the expected gain in the selection, with and without competition effect, and genetic and phenotypic correlation was based on REML/BLUP procedure. Significant phenotypic differences were observed among and within progeny for all available traits, especially with regards to evaluating the competition effect. The thinning at 12 years after planting contributed positively to the increase of plant diameter at breast height and resin production, with an average of 30.62cm and 4.83kg/tree .-1 /year -1 . The individual narrow sense of heritability ranged from 0.25 to 0.38 for dbh and volume. The correlations between the growing traits were positive and significant. Therefore, different selection methods will be proposed separately for two traits (resin and wood). Despite ...