Genetic gain based on effective population size of rubber tree progenies

• Autor(a) principal: Arantes, Flávio Cese
• Data de Publicação: 2011
• Outros Autores: Gonçalves, Paulo de Souza, Junior, Erivaldo José Scaloppi, Moraes, Mario Luiz Teixeira de, Resende, Marcos Deon Vilela de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/9089
• topic: Hevea brasiliensis; multi-effects index; REML/BLUP; HMM test.; Hevea brasiliensis; índice multiefeitos; REML/BLUP; teste precoce HMM.

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.