Híbridos de mamoneira (Ricinus communis L.) obtidos por meio da hibridação convencional e do método de híbridos crípticos

• Ano de defesa: 2015
• Autor(a) principal: Toppa, Eder Victor Braganti [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Mamona; Plantas - Melhoramento genetico; Hibridação vegetal; Plant-breeding
• Link de acesso: http://hdl.handle.net/11449/123375; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/30-04-2015/000829290.pdf

As a consequence of population breeding, new ideas and methods have arisen in order to improve the efficiency in obtaining lines and hybrids, as well as to decrease the time required for their production. This is the case of the Cryptic Hybrids method, which corresponds essentially to an early combination test through breeding between individual plants. Although the Cryptic Hybrids method may represent time gain in hybrid production, it can be considered of restrict use in breeding programs of allogamous species, mainly due to excessive vigor loss in female lines with the conduction of successive self-pollinations. In breeding programs of species with mixed reproductive system, the method is supposed to be an effective tool since endogamic depression is negligible in these species. Based on the need of information that allow assessing the real potential of the Cryptic Hybrids method in mixed reproductive system, this study aimed to comparatively analyze the behavior of castor bean (Ricinus communis L.) hybrids produced through the conventional process, in which the lines are extracted by the Standard method, relative to those obtained by the Cryptic Hybrids method. The study reports grain productivity, oil content, oil productivity and plant height results for 24 interpopulational hybrids, of which 12 were conventionally produced and the other 12 were produced by the Cryptic Hybrids method; all of them were synthesized at the Department of Plant Production of the School of Agronomical Sciences.