Divergência genética entre acessos de abóbora para estabelecimento de coleção nuclear e pré-melhoramento para óleo funcional

• Autor(a) principal: Sobreira, Fábio Moreira
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1367
• topic: Cucurbita moschata; Análise multivariada; Germoplasma; Recursos genéticos vegetais; Coleção nuclear; Cucurbita moschata; Multivariate analysis; Germplasm; Plant genetic resources; Core collection; CNPQ::CIENCIAS BIOLOGICAS::GENETICA::GENETICA VEGETAL

This study aimed to evaluate the genetic diversity and establishing core collection of access Cucurbita moschata belonging BGH/UFV based on biochemical and morphological characteristics of seed oil, and to identify promising accesses for breeding programs of functional oil of pumpkin seeds. For establishment of core collection were evaluated three sampling intensities of accesses (20%, 30% and 40%). Sampling was conducted from Tocher group reversed, based on sum similarity matrix and from the similarity matrix Gower. The validation of collection was performed by use of index matching of amplitude for each group of characteristics (quantitative or qualitative). To identify promising accesses for breeding programs of functional oil of pumpkin seeds was considered the genetic diversity of biochemical and morphoagronomic quantitative characters of oil seeds. Genetic divergence among accessions was estimated based on Euclidean distance matrix standardized average, with subsequent application of the method of Tocher. In the establishment of core collection has been found that inferences on diversity based in a group of agronomic characteristics (quantitative or qualitative), can not be extrapolated to other and that the Gower algorithm and the algebraic sum of matrices were equivalent, as measure of distance, only in the sampling intensities of 30 and 40%. In relation to oil from the seeds, the average concentration in accessions was 41.68% and the major fatty acids were linoleic acid (54,46%), oleic (21,15%), palmitic (15,07%), stearic (9,09%) and linolenic (0,21%). For both diversity analysis performed was observed significant genetic variation among accessions of BGH/UFV for morphoagronomic and biochemical characteristics of the oil of pumpkin seeds. The core collection will be established by accessions from the Gower or Soma collection under sampling intensity of 20%. The accessions BGH-7765, BGH-4615 and BGH-7319 are promising for breeding programs of functional oil of pumpkin seeds.