Ganho genético com base no tamanho efetivo populacional de progênies de seringueira
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Data
2010-12-01
Autores
Arantes, Flávio Cese [UNESP]
Gonçalves, Paulo de Souza
Scaloppi Junior, Erivaldo José
Moraes, Mario Luiz Teixeira de [UNESP]
Resende, Marcos Deon Vilela de
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Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Resumo
O objetivo deste trabalho foi estimar os ganhos genéticos de um teste de progênies de seringueira para a produção de borracha seca e, com base no maior tamanho efetivo populacional e maior ganho genético, obter os melhores indivíduos. Foram utilizadas 30 progênies de meios-irmãos, provenientes de sementes de polinização mista - alogamia e autogamia - de testes clonais no Estado de São Paulo. Utilizou-se o delineamento experimental de blocos ao acaso, com 30 tratamentos (progênies), 3 repetições e parcelas lineares de 10 plantas, em um espaçamento de 3x3 m, o que totalizou 900 plantas úteis. Aos três anos, o perímetro, a 50 cm do solo (PA50), e a produção de borracha seca (PBS) foram avaliadas por meio do teste precoce de produção Hamaker Morris-Mann (HMM). As variáveis foram analisadas pelo método de modelo linear misto, via procedimento REML/BLUP, em progênies com sistema reprodutivo misto e taxa de autofecundação de 22%. A identificação dos 20 melhores indivíduos quanto à PBS e ao PA50 proporcionou ganho genético de 67,96 e 16,48%, respectivamente, e um coeficiente de endogamia de aproximadamente 2,82%. O teste de progênies proporciona produção de sementes com melhor valor genético, grande variabilidade e baixa endogamia
The objective of this work was to evaluate genetic gains of a rubber tree progeny test for dry rubber yield and, based in the largest effective size and largest genetic gain, to get the best individuals. Thirty progenies of half-sib from seeds of mixed pollination - autogamy and outcrossing - clone tests from state of São Paulo were used. An experimental design in randomized block was used with 30 treatments (progenies), three replications, and plots of 10 plants, spaced 3x3 m, comprising a total of 900 useful plants. At three years old, girth growth at 50 cm of the ground (PA50) and dry rubber yield (PBS) were evaluated using the test Hamaker-Mann Morris (HMM). The variables were analyzed through the method of linear mixed model REML/BLUP in progenies that showed mixed mating system and self-pollination rate of 22%. The identification of the 20 best individuals for PBS and PA50 provided a genetic gain of 67.96 and 16.48%, respectively, and an inbreeding coefficient of approximately 2.82%. The progeny test provides seed production with better breeding value, high genetic variability and low inbreeding
The objective of this work was to evaluate genetic gains of a rubber tree progeny test for dry rubber yield and, based in the largest effective size and largest genetic gain, to get the best individuals. Thirty progenies of half-sib from seeds of mixed pollination - autogamy and outcrossing - clone tests from state of São Paulo were used. An experimental design in randomized block was used with 30 treatments (progenies), three replications, and plots of 10 plants, spaced 3x3 m, comprising a total of 900 useful plants. At three years old, girth growth at 50 cm of the ground (PA50) and dry rubber yield (PBS) were evaluated using the test Hamaker-Mann Morris (HMM). The variables were analyzed through the method of linear mixed model REML/BLUP in progenies that showed mixed mating system and self-pollination rate of 22%. The identification of the 20 best individuals for PBS and PA50 provided a genetic gain of 67.96 and 16.48%, respectively, and an inbreeding coefficient of approximately 2.82%. The progeny test provides seed production with better breeding value, high genetic variability and low inbreeding
Descrição
Palavras-chave
Hevea brasiliensis, índice multiefeitos, REML/BLUP, teste precoce HMM, Hevea brasiliensis, multi-effects index, REML/BLUP, HMM test
Como citar
Pesquisa Agropecuária Brasileira. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Informação TecnológicaPesquisa Agropecuária Brasileira, v. 45, n. 12, p. 1419-1424, 2010.