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Revista fitotecnia mexicana
versão impressa ISSN 0187-7380
Resumo
MARQUEZ-SANCHEZ, Fidel. Inbreeding in maize submitted to recurrent selection for combining ability. Rev. fitotec. mex [online]. 2014, vol.37, n.4, pp.315-317. ISSN 0187-7380.
In the three types of recurrent selection for combining ability in maize (Zea mays L.), S1 lines are used as selection units. The selection criteria are the top crosses made among S1 lines and their respective testers: an open-pollinated variety; a highly homogeneous line; and variety B for the S1 lines from variety A, and variety A for S1 lines from variety B. Generated inbreeding occurs because of crossing among selected S1 lines in the three types of recurrent selection, though selected S1 lines are not the same in the three types of selection. In this paper, considering 20 lines S1 y 20 plants per line, inbreeding in cycle ten reached a very high value (0.59). Reduction of inbreeding to 0.20 can be achieved by making only two or three selection cycles.
Palavras-chave : Zea mays; inbreeding; recurrent selection; combining ability.