Resumo

MARQUEZ-SANCHEZ, Fidel. Inbreeding in a maize synthetic of selfed-sib families (S₁ lines). Rev. fitotec. mex [online]. 2013, vol.36, n.3, pp.259-261. ISSN 0187-7380.

Synthetics are genetically improved populations for farmers that cannot buy hybrid seed. In this paper, inbreeding is calculated for a maize synthetic (Zea mays L.) created with selfed-sib families (AH) or S₁ lines. The synthetic is obtained from the first generation by open pollination of a balanced composite made with the families. Inbreeding in the first generation is calculated through an equation that includes several generations: F(AH)₁ = (1/4nm) [(2m + 1) + 4 m(n - 1)F₁ + 2(m - 1)F₀ + F₁], where n is the number of families, m the number of plants per family, and F is the inbreeding coefficient which sub-indexes are the generation numbers. After elimination of the terms with zero inbreeding in the recurrent equation , inbreeding in an F₁ synthetic with 10 families and 10 plants per family is equal to 0.0526. The number of families affects more the synthetic inbreeding than the number of plants per family.

Palavras-chave : Zea mays; inbreeding; selfed-sib families; synthetic variety.

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