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Revista mexicana de ciencias agrícolas
Print version ISSN 2007-0934
Rev. Mex. Cienc. Agríc vol.14 n.2 Texcoco Feb./Mar. 2023 Epub June 19, 2023
https://doi.org/10.29312/remexca.v14i2.2990
Articles
Combining ability and reciprocal effects of earliness in native corn populations of Tamaulipas
1División de Estudios de Posgrado e Investigación-Facultad de Ingeniería y Ciencias-Universidad Autónoma de Tamaulipas. Centro Universitario Adolfo López Mateos, Ciudad Victoria, Tamaulipas, México. CP. 87000. Tel. 834 3181721, ext. 2146. (resendizmorelos.mod4@gmail.com; antonyya-17@hotmail.com; benestrada@docentes.uat.edu.mx; jmcoronado@docentes.uat.edu.mx).
2Misión Biológica de Galicia-Consejo Superior de Investigaciones Científicas. A Carballeira 8, Salcedo, Pontevedra, España. CP. 36143. Tel. +34 986 854800. (rmalvar@mbg.csic.es).
The earliness and adaptation of native corn of Tamaulipas in restrictive environments allows considering it a source of variability for genetic improvement programs, so it is necessary to know the genetic effects that control its variation. The objective was to determine the gene action that controls the variation of the earliness of native corn populations of Tamaulipas and the relationship of earliness with grain yield. In Güémez, Tamaulipas, in the agricultural cycles of autumn-winter 2019-2020 and spring-summer 2020 with application and non-application of insecticide to combat S. frugiperda, the genetic effects of days to male and female flowering of six corn populations, their direct and reciprocal crosses were evaluated, through a diallel analysis with the Griffing method, the correlation between flowering and grain yield was analyzed. For male and female flowering, there were no effects of general combining ability and there were effects of specific combining ability, reciprocal and maternal: the variation between cultivars was explained in 53% for male flowering and 45% for female flowering by effects of specific combining ability, for male flowering 38% of the variation between cultivars and 43% for female flowering was due to reciprocal effects. The variation between cultivars depended on non-additive effects and there was cytoplasmic inheritance involved in their expression. Earliness was positively correlated with grain yield in the spring-summer cycle without insecticide application. With high specific combining ability, TML3S3×VHA and Cam×VHA stood out, to take advantage of the reciprocal effects in Cam×VHA, the order of the parents must be considered.
Keywords: S. frugiperda; Zea mays; maternal effects
La precocidad y adaptación del maíz nativo de Tamaulipas en ambientes restrictivos, permite considerarlo fuente de variabilidad para programas de mejoramiento genético, por ello es necesario conocer los efectos genéticos que controlan su variación. El objetivo fue determinar la acción génica que controla la variación de la precocidad de poblaciones de maíz nativo de Tamaulipas y la relación de la precocidad con el rendimiento de grano. En Güémez, Tamaulipas, en otoño-invierno 2019-2020 y primavera-verano 2020 con aplicación y no aplicación de insecticida para combatir S. frugiperda, se evaluaron los efectos genéticos de días a floración masculina y femenina de seis poblaciones de maíz, sus cruzas directas y reciprocas, mediante un análisis dialélico con el método de Griffing, se analizó la correlación entre la floración y el rendimiento de grano. Para floración masculina y femenina no existieron efectos de aptitud combinatoria general y existieron efectos de aptitud combinatoria especifica, recíprocos y maternos: la variación entre cultivares se explicó en 53% para floración masculina y 45% para femenina por efectos de aptitud combinatoria especifica, para floración masculina 38% de la variación entre cultivares y 43% para femenina fue debida a efectos recíprocos. La variación entre cultivares, dependió de efectos no aditivos y existió herencia citoplasmática involucrada en su expresión. La precocidad se correlacionó positivamente con el rendimiento de grano en el ciclo primavera-verano sin aplicación de insecticida. Con aptitud combinatoria especifica alta sobresalieron TML3S3×VHA y Cam×VHA, para aprovechar los efectos recíprocos en Cam×VHA hay que considerar el orden de los progenitores.
Palabras clave: S. frugiperda; Zea mays; efectos maternos
Introduction
Corn is a grass of economic importance and wide genetic and morphological variability; it is produced in all agroecological regions of Mexico. This favors that this crop is attacked by a wide diversity of pest insects in tropical and subtropical regions, such as northeastern Mexico, where Spodoptera frugiperda (J. E. Smith) or fall armyworm stand out (Fernández et al., 2013; Yáñez et al., 2019). This insect, in the larval stage, mainly consumes developing leaf tissue, which decreases the photosynthetic area of the plant and consequently the grain yield (Neves et al., 2020; Obok et al., 2021).
Due to the above, synthetic insecticides are mainly used for its control (Burtet et al., 2017), which can lead to resistance in the insect, elimination of non-target species (Neves et al., 2020) and environmental pollution (Guo et al., 2020). An alternative to reduce these risks is the use of cultivars tolerant to leaf damage caused by S. frugiperda (Smith and Clement, 2011). To obtain these cultivars through genetic improvement, it is necessary to identify and have base germplasm with adaptation to specific agroecological conditions (Fuentes et al., 1998).
Corn-growing agricultural regions in Tamaulipas, as in much of the world, due to climate change (Yujie et al., 2021), present humidity restriction, extreme temperatures and a period of dog days, where the temperature exceeds 40 °C (Castro et al., 2013). This causes a decrease in the growth cycle in the crop (Luna et al., 2005), generating the need to use cultivars with high earliness (Pecina-Martínez et al., 2009), between 50 and 70 days to flowering, spring-summer (SS) and autumn-winter (AW), respectively.
Earliness in corn is mainly estimated by the days from sowing to male and female flowering (García et al., 2020). This is related to high photosynthetic efficiency, adequate distribution of assimilates, lower plant height (Dos Santos et al., 2019) and high harvest index (Coutiño-Estrada et al., 2014). Therefore, within a genetic improvement program for the tolerance of corn to S. fruigperda damage in the dry tropics, it is desirable to use earliness as a complementary criterion for selection and evaluation (Preciado et al., 2002).
However, it is considered that early cultivars have lower yields than late ones, therefore, it is necessary to characterize, in the base germplasm, the specific relationships between earliness and grain yield, and to know the genetic effects that control the expression of variation in earliness (Dzib-Aguilar et al., 2011). The native populations of central and southern Tamaulipas, in addition to wide variability, have potential for high yield, earliness and adaptation to restrictive environmental conditions (Pecina et al., 2011), since they have developed in the environments described above (González-Martínez et al., 2020).
On the other hand, to comprehensively know the gene action that controls the variation of the base germplasm, a phenotypic and genotypic evaluation must be carried out, using characteristics that favor adaptation to the specific agroecological regions of interest (Ertiro et al., 2017). In this sense, there are tools that help to know the genetic components that control the phenotypic variation of corn populations, which allows selecting the most appropriate improvement method (González et al., 2016; Ferreira et al., 2020).
The diallel designs are defined as a set of simple crosses between a group of n parents (Sánchez-Ramírez et al., 2017), they allow estimating the effects of general (GCA) and specific (SCA) combining ability, reciprocal, maternal and non-maternal effects (Griffing, 1956; Ramírez-Díaz et al., 2019). The relative proportion of the sum of squares of reciprocal effects, GCA and SCA in relation to the sum of squares of crosses indicates the proportion of influence of each type of gene action on the variation of the germplasm evaluated, where GCA is mainly associated with additive effects, while non-additive effects are associated with SCA and reciprocal effects, the latter are the result of maternal and/or non-maternal effects (Hernández and De León, 2021).
The expression of variation in the days to flowering of corn depends mainly on the effects of GCA and SCA (De la Cruz et al., 2003; García et al., 2020), there is also influence of reciprocal effects (Cervantes-Ortiz et al., 2018) but there is little or no information on their proportion, due to maternal and non-maternal effects (Issa et al., 2018)
It is recognized that the level of genetic diversity of parents influences the expression of reciprocal effects (de la Cruz et al., 2003; Sánchez-Ramírez et al., 2017), so it is necessary to establish this type of parameters in a specific way, for each population or group of populations to be used as base germplasm for improvement. Based on the above, the objective of this study was to determine the gene action that controls the variation of the earliness of native corn populations of Tamaulipas and the relationship of earliness with grain yield.
Materials and methods
Location and management of the experiment
The experiment was carried out in the Experimental Field of ‘Ingeniero Herminio García González’ Zootechnical Post, belonging to the Autonomous University of Tamaulipas in Güémez, Tamaulipas, Mexico; at an altitude of 193 masl, at 23° 56’ 26” north latitude and 99° 05’ 59” west longitude, during the agricultural cycles AW 2019-2020 and SS 2020. The sowing dates were February 7 and August 4, respectively for each cycle.
The preparation of the land and the management of the crop were carried out in accordance with the recommendations for the production of corn in the north-central zone of Tamaulipas under irrigation conditions (Reyes, 2017a; Reyes, 2017b) and a population density of 50 000 plants ha-1.
Variables evaluated and experimental treatments
In both agricultural cycles, the genetic effects of the days to male and female flowering of six corn populations, their direct and reciprocal crosses, were evaluated by means of a diallel analysis with the method I of Griffing (1956). The complete diallelic was formed during the SS 2019 agricultural cycle by manual pollination of the six populations evaluated (Table 1).
Table 1 Corn genotypes developed from native germplasm, used to assess genetic effects during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
Genotype | Type | Collection | Year of Collection | Municipalities of Origin | Geographical coordinates | |
N | W | |||||
PWL1S3 | Line S3 | 3001 | 2003 | Padilla | 23°59'00'' | 98°52'00'' |
TGL2S3 | Line S3 | 3007 | 2003 | Tula | 22°59'00'' | 99°43'00'' |
TML3S3 | Line S3 | 3012 | 2003 | Tula | 22°59'00'' | 99°43'00'' |
PWL6S3 | Line S3 | 3001 | 2003 | Padilla | 23°59'00'' | 98°52'00'' |
VHA | Variety | - | 2004 | Center-South | - | - |
Cam | Native | 2011 | 2011 | Hidalgo | 24°10'00'' | 99°21'00'' |
Two management strategies for S. frugiperda were established, with and without application of the insecticide emamectin benzoate (2.12%), the applications began from the complete exposure of the fourth leaf every 20 days until reaching flowering in a dose of 100 ml ha-1, the combination of agricultural cycle and management strategy allowed the establishment of four environments.
Experimental design
The experiment was established in a randomized complete block design with three repetitions, in an arrangement of split plots for each cycle. The two management strategies of S. frugiperda with application and without application of insecticide were located in the large plot and the corn cultivars in the small plot. The total usable area of each experiment was 864 m2. The experimental unit was delimited in an area of 4 m2.
The days to male and female flowering were determined. The first was obtained by counting the days elapsed from the date of sowing until the moment in which 50% of the plants of each experimental unit presented panicles with pollen release in its middle part. The second was determined by counting the days from the sowing date until the time when 50% of the plants in each experimental unit exposed stigmas in the female inflorescence (CIMMYT, 1995).
Statistical analysis
An analysis of variance was performed for each of the variables, with the value of the mean minus the standard deviation (μ-σ), the crosses with the lowest number of days to flowering (of greater earliness) compared to the mean were determined and a mean comparison test was performed with the Tukey method with a significance level of α= 0.05 to determine differences between the test environments.
For the estimation of the genetic effects of GCA, SCA and reciprocal effects, the diallel analysis of Griffing (1956) was used by means of method I and model I, in which the parental lines, direct and reciprocal F1 crosses were examined, for which the Diallel-SAS05 algorithm proposed by Zhang et al. (2005) was used, which allows the division of reciprocal effects into maternal and non-maternal. A correlation analysis was performed between the days to male and female flowering and the grain yield per plant, jointly and individually in each environment. All statistical analyses were performed using the Statistical Analysis System (SAS, 2002).
The contribution of GCA, SCA and reciprocal effects to the variation of this germplasm was calculated based on the proportion (%) of the sum of squares of the source, with respect to the total sum of squares, while the reciprocal effects were partitioned into maternal and non-maternal effects.
Results and discussion
The statistical analysis showed significance (p< 0.05) between environments and between cultivars for male and female flowering; on the contrary, there was no significant interaction (p≥ 0.05) for environment × cultivar (Table 2). The above demonstrates that the differential environmental conditions determined by the combination of agricultural cycle and management strategy of S. frugiperda had a similar effect for the expression of days to flowering of each of the cultivars evaluated; that is, the cultivars presented a similar response to the environmental changes determined by the combination of agricultural cycle and management strategy of S. frugiperda.
Table 2 Diallel analysis for male and female flowering of crosses between native corn populations, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
Source of variation | Male flowering | Female flowering | ||
Sum of squares | Significance | Sum of squares | Significance | |
Environment | 16 381.5 | <0.0001 | 14 032.3 | <0.0001 |
Cultivar | 629.2 | <0.0001 | 463.2 | 0.0002 |
E×C | 611.5 | 0.8397 | 587 | 0.6473 |
GCA | 55.8 | 0.154 | 57.9 | 0.0877 |
GCA | 332.9 | <0.0001 | 207.3 | 0.004 |
RE | 240.5 | 0.0038 | 198 | 0.0063 |
RE×E | 44.5 | 0.9692 | 51.7 | 0.891 |
GCA×E | 42.7 | 0.2903 | 38.2 | 0.2721 |
GCA×E | 35.5 | 0.99 | 58.5 | 0.8289 |
ME | 137.8 | 0.0016 | 94.8 | 0.0073 |
nME | 102.7 | 0.1416 | 101.2 | 0.0813 |
ME×E | 7.9 | 0.95 | 10.8 | 0.8749 |
nME×E | 36.6 | 0.8667 | 41 | 0.737 |
E= environment; C= cultivar; GCA= general combining ability; SCA= specific combining ability; RE= reciprocal effects; ME= maternal effects; nME= non-maternal effects.
No significant effects of GCA were observed for the variables evaluated and there was no statistical significance for the interaction of GCA × environment (Table 2). On the contrary, there were significant effects of SCA, reciprocal and maternal for both variables evaluated, the significant effect of SCA indicates that within the evaluated germplasm there is variability for the gene expression of male and female flowering due to non-additive effects (García et al., 2020).
The significance for reciprocal effects showed that the average number of days to male and female flowering of the direct cross (i, j) is different from that of the reverse cross (j, i) for at least one pair of parents (i, j), so populations that serve as female or male parents should be specifically considered (Núñez-Terrones et al., 2019). This was the result of significant maternal effects, which indicates that female and male flowering expression in these crosses was controlled by cytoplasmic genes (Mahgoub, 2011).
The expression of variation among the evaluated cultivars is explained in 52.91% for male flowering and 44.75% for female flowering by SCA effects (Table 2), while 38.22% of the variation in male flowering between cultivars and 42.74% for female flowering was due to reciprocal effects (Table 2). This indicates that non-additive effects were more important in the expression of genetic variation, both for male and female flowering; that is, the observed number of days elapsed from sowing to flowering in crosses is mostly due to dominance or non-additive effects and this may be due to genetic divergence between populations for these variables (De la Cruz et al., 2003).
Therefore, the improvement of earliness in these populations should be done through processes of recurrent reciprocal selection or hybridization (Rodríguez et al., 2020) and the formation of a particular cross should specifically consider the lines that will serve as a female or male parent (Núñez-Terrones et al., 2019). For male flowering, crosses TML3S3×VHA and Cam×VHA presented significant SCA with a negative estimator (Table 3), which indicates that they had fewer days to male flowering than expected according to the GCA of the populations that participated as parents (Mahgoub, 2011), with an average of 63.4 and 63.7 days respectively (Table 4).
Table 3 Estimators and significance of specific combining ability in corn populations for male and female flowering, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
PWL1S3 | TGL2S3 | TML3S3 | PWL6S3 | Cam | VHA | |
PWL1S3 | 0.0115 | 0.7129 | -0.1828 | -0.5231 | -0.0926 | |
TGL2S3 | -0.0556 | -0.4745 | -0.8287 | -0.5023 | -0.1551 | |
TML3S3 | 0.3264 | 0.0486 | 0.2893 | -0.5926 | -1.037* | |
PWL6S3 | 0.0139 | -1.3055** | 0.0764 | 0.0949 | -0.3495 | |
Cam | -0.1528 | -0.3889 | -0.3819 | 0.0972 | -0.9398* | |
VHA | 0.0208 | -0.0069 | -0.7916 | -0.1458 | -0.7708 |
Male flowering above the diagonal; female flowering under the diagonal. *= significant (p< 0.05); **= highly significant (p< 0.01).
Table 4 Days to male and female flowering of corn populations and their crosses, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
♂ ♀ | PWL1S3 | TGL2S3 | TML3S3 | PWL6S3 | Cam | VHA |
Male flowering (days) | ||||||
PWL1S3 | 64.7 | 65.2 | 65 | 63.4 | 63.2 | 66.3 |
TGL2S3 | 64 | 66.4 | 63.2 | 62.3* | 63.6 | 65.4 |
TML3S3 | 65.1 | 64.3 | 65.1 | 62.5* | 63.5 | 64.2 |
PWL6S3 | 64.2 | 63.8 | 65.4 | 64.3 | 64.5 | 63.7 |
Cam | 64.7 | 64.2 | 63.6 | 63.3 | 66.7 | 64.9 |
VHA | 63.1 | 63.7 | 62.7* | 63.9 | 62.4* | 67.5 |
Female flowering (days) | ||||||
PWL1S3 | 66.2 | 67.7 | 66.8 | 65.4* | 65.9 | 67.5 |
TGL2S3 | 65.5* | 68.7 | 67.2 | 64* | 65.8 | 68.2 |
TML3S3 | 67.1 | 66.7 | 67.7 | 65.2* | 66.3 | 66.9 |
PWL6S3 | 66.6 | 66 | 67.5 | 66.9 | 67.1 | 66 |
Cam | 66.7 | 67 | 66.5 | 65.4* | 68.2 | 67.1 |
VHA | 66.1 | 65.9 | 65.7 | 66.6 | 65.2* | 68.9 |
♀= maternal parent; ♂= paternal parent. Direct crosses above the diagonal, parents on the diagonal; reciprocal crosses under the diagonal; *= less than μ-σ; μ= mean; σ= standard deviation.
Similarly, for the days to female flowering the cross TGL2S3×PWL6S3 presented significant SCA with a negative estimator (Table 3) with an average of 65 days (Table 4). Taking into account the above and considering the absence of effects of GCA in this germplasm (Table 2), it can be considered that this behavior is due to a low accumulation of additive genes for male and female flowering in these crosses, with predominance of the parents with expression of over dominance for these variables, where the existence of allelic interaction (SCA) in the evaluated progeny is demonstrated (Gutiérrez et al., 2002).
Thus, it was observed that crosses with significant SCA had fewer days to male and female flowering compared to their parents (Table 4). This is consistent with what was established by de la Cruz et al. (2003), who point out that, in general, the development of crosses is faster than that of their parents; mainly due to the hybrid vigor or heterosis, which favors high rates of development and growth compared to their parents. The differences shown for male and female flowering between the crosses evaluated may be indicative of genetic diversity among the parent populations, as noted by Guillén-De la Cruz et al. (2009).
For male flowering the crosses PWL1S3×VHA, TML3S3×PWL6S3 and Cam×VHA showed significant reciprocal effects and for female flowering PWL1S3×TGL2S3, TGL2S3×PWL6S3, TGL2S3×VHA and TML3S3×PWL6S3 (Table 5). The above means that direct cross is different from reciprocal cross (Picón-Rico et al., 2018) and it is verified in Table 4, where it can be seen that, between direct and reciprocal crosses, there are differences of 3.2, 3 and 2.8 days respectively, for male flowering and for female flowering of 2, 2, 2.5 and 2.3 days (Table 4).
Table 5 Estimators of reciprocal effects for male and female flowering in native corn populations, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
PWL1S3 | TGL2S3 | TML3S3 | PWL6S3 | Cam | VHA | |
PWL1S3 | 0.5833 | -0.0416 | -0.4166 | -0.7083 | 1.625** | |
TGL2S3 | 1.0833* | -0.5833 | -0.75 | -0.2916 | 0.875 | |
TML3S3 | -0.125 | 0.25 | -1.4583** | -0.0416 | 0.75 | |
PWL6S3 | -0.5833 | -1* | -1.125* | 0.5833 | -0.125 | |
Cam | -0.4167 | -0.5833 | -0.0833 | 0.8333 | 1.25* | |
VHA | 0.7083 | 1.1667* | 0.625 | -0.2917 | 0.9167 |
Male flowering above the diagonal; female flowering under the diagonal; *= significant (p< 0.05); **= highly significant (p< 0.01).
Considering all the above, for male and female flowering, VHA×Cam stands out with 62.4 and 65.2 days respectively, values lower than the general mean minus the standard deviation (Table 4). Demonstrating a greater earliness, a favorable characteristic for its adaptation to short growth cycles (Luna et al., 2005), such as those that occur in most agroecological regions of Tamaulipas (Pecina-Martínez et al., 2009).
Significant maternal effects were determined in the parents PWL6S3 and VHA, the first with a positive estimator and the second with a negative estimator; both for male and female flowering (Table 6). The above indicates that some of the crosses that had VHA as their maternal parent presented a lower number of days to flowering compared to their reciprocal crosses; as observed in PWL1S3×VHA and Cam×VHA with 66.3 and 64.9 days to male flowering respectively, while VHA×PWL1S3 and VHA×Cam recorded 63.1 and 62.4 days respectively (Table 4 and 5).
Table 6 Estimators of maternal effects for male and female flowering in corn populations, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
Parent | Male flowering | Female flowering | ||
Estimator | Significance | Estimator | Significance | |
PWL1S3 | 0.1736 | 0.3851 | 0.1111 | 0.5505 |
TGL2S3 | -0.2222 | 0.2665 | -0.2083 | 0.2633 |
TML3S3 | -0.0208 | 0.9169 | -0.118 | 0.5258 |
PWL6S3 | 0.5139 | 0.0105 | 0.5416 | 0.0039 |
Cam | 0.2847 | 0.1548 | 0.1944 | 0.2964 |
VHA | -0.7291 | 0.0003 | -0.5208 | 0.0054 |
Conversely, when PWL6S3 was the maternal parent, at least one cross had a higher number of days to male and female flowering compared to the cross where this population participated as the paternal parent. An example of this is PWL6S3×TML3S3 with 65.4 and 67.5 days to male and female flowering respectively, compared to TML3S3×PWL6S3 with 62.5 and 65.2 days (Table 4). The above shows that the variation of the expression of male and female flowering is controlled by cytoplasmic or extranuclear inheritance (Sánchez-Ramírez et al., 2017), which must be taken into consideration when defining the order of the parents in the crosses to be carried out (Andrio-Enríquez et al., 2015).
When the four environments evaluated were considered, no significant correlation (p> 0.05) was observed between grain yield per plant and days to male and female flowering (Table 7). This same result was observed in the AW agricultural cycle, in both management strategies of S. frugiperda and in the SS cycle only with application of emamectin benzoate.
Table 7 Coefficient of correlation between male and female flowering with grain yield, during the cycles AW 2019-2020 and SS 2020, Güémez, Tamaulipas, Mexico.
Male flowering | Female flowering | Grain yield per plant (g) | |||||
Coefficient of correlation | (days) | Coefficient of correlation | (days) | ||||
Combined¤ | 0.04276 | 64.3 | 0.03942 | 66.6 | 92.1 | ||
No insecticide AW | -0.10366 | 70.5 | a | -0.09085 | 72.2 | a | 93 |
With insecticide AW | 0.04212 | 70.4 | a | -0.03563 | 72.4 | a | 95.1 |
No insecticide SS | -0.22928* | 58.2 | b | -0.30501** | 60.9 | b | 82.6 |
With insecticide SS | -0.13055 | 58 | b | -0.1034 | 60.9 | b | 97.7 |
¤= the four test environments together; AW= autumn winter; SS= spring summer; *= significant (p< 0.05); **= highly significant (p< 0.01); a, b= averages with different literal by column are statistically different (Tukey α= 0.05).
Conversely, in the SS agricultural cycle when no insecticide was applied to S. frugiperda, a significant and positive correlation of grain yield per plant with male and female flowering was observed (Table 7), this indicates that the earliest cultivars had a higher grain yield per plant. This is due to the fact that the SS cycle presents environmental conditions of higher temperature at the beginning of the growth cycle compared to the AW agricultural cycle (González et al., 2016; Reyes, 2017a), which reduces the length of the growth period (Ruiz-Corral et al., 2002; Kalimuthu et al., 2015), favoring the development and growth of early cultivars (Luna et al., 2005).
In this agricultural cycle, a higher incidence of S. frugiperda has been reported, compared to the AW cycle (Cantú et al., 2010; Peterson et al., 2017) and in this study when no insecticide was applied, there was a greater average leaf damage caused by S. frugiperda, 2.96 on a scale of 0 to 5, compared to the AW agricultural cycle without insecticide application of 1.81 and with insecticide application in both cycles without apparent leaf damage (data not shown), which allows inferring that cultivars of greater earliness have better adaptation to environmental conditions with the presence of pests and high temperature.
Conclusions
The variability for male and female flowering between cultivars is mainly explained by specific combining ability and reciprocal effects; the latter are the result of maternal effects. The earliness observed in the crosses TML3S3×VHA, Cam×VHA and TGL2S3×PWL6S3 shows cytoplasmic inheritance. In restrictive environments of high temperature and presence of S. frugiperda, early cultivars have higher grain yields.
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Received: January 01, 2023; Accepted: February 01, 2023