In the context of the mutants, polyembryony in maize (PEm) has agronomic potential; therefore, the inclusion of the PEm in new varieties may be useful when considering the ascending demand for food. The objective of this study was to develop new genotypes with high productivity potential, superior to in local area, and useful for family and extensive agriculture. In this work, single crosses were carried out between three pure lines and the high frequency polyembryonic populations. The resulting F1 were advanced to the third generation (G3) and the genotypes obtained from this last generation were used as progenitors of a mating plan, according to the Griffing method 4. The resulting crosses were evaluated in a yield test measuring common characteristics of economic importance (Days to Male Flowering (MF), Plant Height (PH), Cob Height (CH), Fusarium Rotten cobs, Cobs (CFUS), Yield (YLD), and analyzed with the computer routine DIALLEL-SAS05. The results allowed to indicate that both the source of variation Genotypes as additive effects (GCA) presented significance for all variables, while non-additive (SCA) were significant only in the variables of cob sanity (p≤0.01) and productivity (p≤0.05). In this regard, most of the variables showed a greater contribution of the effects of General Combining Ability (GCA) compared to Specific Combining Ability (SCA). In addition, it was observed that the crosses were superior in all the variables evaluated with respect to BAP and NAP, and statistically similar in some cases with respect to hybrids. This means that this type of segregant polyembryony crosses can compete with other materials evaluated in the region. The estimation of GCA and SCA generated information on the potential of the studied parents and their crosses and are worthy of being taken into account in the formation of varieties.
Uno de los problemas fitosanitarios limitantes de la producción del cultivo de tomate (Solanum licopersicum L.) a nivel mundial y nacional es el marchitamiento vascular ocasionado por Fusarium oxysporum f. sp. lycopersici (Fol), ocasionando grandes pérdidas económicas. El objetivo de este estudio fue determinar la variabilidad en la virulencia de cepas de Fusarium aisladas de plantas de tomate con síntomas típicos de marchitez vascular en parcelas productoras de tomate en el estado de Hidalgo y evaluar la incidencia y severidad de Fol raza 3 en siete genotipos de tomate. Para la identificación de razas se realizaron pruebas de patogenicidad en materiales diferenciales, además un índice de enfermedad se usó para calcular el área bajo la curva de progreso de la enfermedad (ABCPE), que permitió identificar genotipos con tolerancia a Fol. Se identificaron las razas 2 y 3 de Fol en una proporción de 33 y 67%, respectivamente, además se proporciona información sobre el comportamiento de siete genotipos de tomate, de los cuales Y53 y D3 presentaron la menor incidencia de Fol, lo cual resalta la importancia de usarse en trabajos futuros sobre resistencia a este patógeno.
Objective: To analyze the genetic diversity (agronomic attributes, forage yield, and fiber content) of 100 maize inbred lines and to identify genotypes with potential for the breeding of plants with the said traits. Design/methodology/approach: One-hundred maize inbred lines were evaluated in two environments, in a 10 x 10 complete block experimental design, with two repetitions. Days to male flowering, days to female flowering, ear height, plant height, stem diameter, green forage yield, neutral detergent fiber, and acid detergent fiber data were recorded. Results: Significant differences were observed in the environmental sources of variation and genotypes for all the traits evaluated. The first four components account for 81% of the total variation observed and the first two account for 66% of the variation. The variables which have the highest absolute value and which strongly influence the dispersion of the genotypes, as well as the formation of groups, were: plant height, forage yield, and acid detergent fiber (component one) and days to female flowering and days to male flowering (component two). Consequently, the genotypes were dispersed in four groups. Study limitations/implications: It was not possible to conduct genetic diversity studies using molecular markers. Findings/conclusions: The grouping pattern of inbred lines shows the genetic diversity present; this can be an important tool in genetic improvement programs aimed at obtaining hybrids with specific characteristics.
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