Análise comparativa da produtividade de híbridos de mamoneira (Ricinus communis L.) obtidos por meio da hibridação convencional e do método de híbridos crípticos
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Data
2011-07-28
Autores
Toppa, Eder Victor Braganti [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Como conseqüência do melhoramento de populações, novas idéias e métodos surgiram, procurando melhorar a eficiência na obtenção de linhagens e híbridos, bem como diminuir o tempo requerido na sua obtenção. Este é o caso do método dos Híbridos Crípticos, que corresponde essencialmente a um teste precoce de combinação através de cruzamentos entre plantas individuais. Apesar da possibilidade do método dos Híbridos Crípticos representar um ganho de tempo na produção de híbridos, pode ser considerado de uso restrito em programas de melhoramento de espécies alógamas, principalmente em decorrência da excessiva perda de vigor das linhagens femininas com a condução de sucessivas autofecundações. No tocante, supõe-se que em programas de melhoramento de espécies que possuem o sistema reprodutivo do tipo misto, o método possa se configurar como uma ferramenta efetiva em razão de que nestas espécies a depressão endogâmica é desprezível. Ao encontro da necessidade de informações que permitam avaliar o real potencial do método dos Híbridos Crípticos em espécies com sistema reprodutivo do tipo misto, objetivou-se neste trabalho analisar comparativamente o comportamento dos híbridos de mamoneira (Ricinus communis L.) produzidos pelo processo convencional, em que as linhagens são extraídas pelo método “Standard”, com os obtidos pelo método dos Híbridos Crípticos. O estudo relata resultados de produtividade de grãos de 24 híbridos interpopulacionais...
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 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.Experiments to assess the behavior of hybrids were developed in the crop cycles 2006/2007 and 2007/2008, simultaneously in the municipalities Lins and Penápolis, and were all conducted under randomized block design with four replicates. Grain productivity results for castor bean hybrids evidenced that cryptic hybrids are superior to hybrids conventionally... (Complete abstract click electronic access below)
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 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.Experiments to assess the behavior of hybrids were developed in the crop cycles 2006/2007 and 2007/2008, simultaneously in the municipalities Lins and Penápolis, and were all conducted under randomized block design with four replicates. Grain productivity results for castor bean hybrids evidenced that cryptic hybrids are superior to hybrids conventionally... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Mamona, Hibridação vegetal, Linhagens endogâmicas, Inbred lines, Panmitic species
Como citar
TOPPA, Eder Victor Braganti. Análise comparativa da produtividade de híbridos de mamoneira (Ricinus communis L.) obtidos por meio da hibridação convencional e do método de híbridos crípticos. 2011. xi, 86 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas de Botucatu, 2011.