Abstract
Abstract: In many agricultural crops, the number of parents used in cross breeding make it difficult to obtain all possible hybrids in diallels. Therefore, using maize as a model plant and based on traits with high and low heritabilities, the aim of the present study was to quantify the correlation estimates of the general combining ability (GCA) and specific combining ability (SCA) between a complete diallel and a circulant diallel, with and without the inclusion of parents. For the high heritability trait, the GCA estimates can be obtained with low s values, whereas for the SCA estimates, s values close to half the number of parents should be used. For the low heritability trait, information from parents must be used to obtain the SCA estimates. For the GCA estimates, considering the stabilization of r above 0.70 for s=7, s values greater than half the number of parents must be used in the circulant models.
Highlights
From the 1942 paper by Sprague and Tatum (1942), it is understood that general combining ability (GCA) is the result of the average performance of a parent i when crossed with a set of other parents and is associated with additive gene effects
Significant differences were observed by the F test (P < 0.1) for the base set of interpopulation hybrids evaluated by means of the heterosis source of variation, as well as among the populations used as parents to obtain crosses by the source varieties (vi)
The significance of the environmental source of variation (E) indicates that the overall means obtained were statistically different, from which we can infer that the set of selected sites allowed differential expression of the set of evaluated genotypes
Summary
From the 1942 paper by Sprague and Tatum (1942), it is understood that general combining ability (GCA) is the result of the average performance of a parent i when crossed with a set of other parents and is associated with additive gene effects. The concepts of GCA and SCA are extensively used in the breeding of temperate and tropical crops, and according to Hallauer et al (2010), are significant for the diallel mating design In this context, diallel mating designs are widely used for the evaluation of genotypes in many agricultural crops (Hill et al 2001, Souza et al 2012, Mendes et al 2015, Bolson et al 2016), since they provide a better genetic understanding between crosses and prediction of the best crosses between parents (Laude and Carena 2014). Such analyses have been developed for parents that range from inbred lines to varieties with a broad genetic base (Hallauer et al 2010)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
