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Revista fitotecnia mexicana
versão impressa ISSN 0187-7380
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 (σ2A) and dominant (σ2D) variances. Although higher σ2Aof 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.