Resumo

COYAC RODRIGUEZ, J. Luis; MOLINA GALAN, José D.; GARCIA ZAVALA, J. Jesús  e  SERRANO COVARRUBIAS, Luis M.. Mass selection allows yield increments without depleting additive genetic variability in Zacatecas 58 maize variety. Rev. fitotec. mex [online]. 2013, vol.36, n.1, pp.53-62. ISSN 0187-7380.

To estimate the genetic parameters of the maize (Zea mays L.) variety Zacatecas 58 original (Z₀) and its improved version (Z₂₄) obtained through 24 cycles of stratified visual mass selection (SVMS), as well as to estimate the feasibility of continuing the selection process, 35 half-sib (HS) and 35 full-sib (FS) families derived from Z₀ and 40 HS and 40 FS families derived from Z₂₄ were evaluated in four environments for yield per ear per plant (YEP). SVMS increased the yield per plant after 24 cycles (3.65 % per cycle). FS families yielded more (P ≤ 0.05) than HS families, in both populations. Joint evaluation of HS and FS families allowed to estimate genetic additive (σ²_A) and dominant (σ²_D) variances. Although higher σ²_Aof Z₀ than Z₂₄ was expected, this did not occur; however, the additive coefficient of variation (ACV) of Z₀ was higher than Z₂₄, thus indicating it is still possible to further increase yield by SVMS after 24 cycles of selection.

Palavras-chave : Zea mays; families; genetic improvement; mass selection; genetic variances.

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