Resumen

MEZA, Zurel N.; GARCIA, Luis F.  y  GARCIA, Patricia V.. Inheritance of lethal gene ‘luteus-Pa’ from cacao progenies obtained by self and cross-fertilization. Rev. Fac. Nac. Agron. Medellín [online]. 2017, vol.70, n.2, pp.8123-8128. ISSN 0304-2847.  https://doi.org/10.15446/rfna.v70n2.64502.

With the aim to study the inheritance of lethal gene ‘luteus-Pa’ in three derivated progenies from self and cross-fertilization of cacao (Theobroma cacao L) varieties, a study was carried out during january to september, 2013. As genetic material C-25, S-5 y Pa-150 varieties were utilized and this one were self and cross pollinated and their progenies were divided in two replicates with 100 seeds each and sowed in plastic recipients containing a substrate 2:1(soil: sand). In order to contrast the observed segregation with its expected homologous 3:1 (monogenic inheritance), the Chi-square (X2) test was utilized. The results shown that only one from self-fertilized progeny of C-25 variety exhibited the mendelian segregation 3:1 in both replicates, so that it lead to infer this one is carrier of lethal gene ‘luteus-Pa’ in heterozigote condition whereas that the progenie from Pa-150 x C-25 cross no found none lethal seedling and submitted to Chi-square (X2) test it could be to infer this one no segregate in the proportion 3:1 therefore, the Pa-150 variety is no carrier of this lethal gene. A better comprehension on photobiological origin, supported by molecular markers and the functional genomics of this mutant can help to identify and understand the factors involve in the photosynthetic mechanisms.

Palabras clave : Cacao; Self-cross pollination; Lethal factor; Mendelian segregation; Chi-square (X²) test.

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