Abstract
Cowpea aphid-born mosaic virus disease (CABMV) is one of the reasons for rejection of cowpea seed by seed inspectors in Burkina Faso. With regard to this, this study was undertaken to analyze the genetic components underlying the resistance of cowpea lines to the cowpea aphid-borne mosaic virus (CABMV) and to determine the mechanism of transmission of the resistance from parents to offspring. Therefore, crosses were made in 5x5 full diallel design. Data analysis was done following Griffing and Hayman method on disease severity and the area under disease progress curve (AUDPC) for five cowpea varieties during the 2015 off-season at Kamboinse research station. The analysis of variance associated with the general and specific combining abilities (GCA and SCA) and reciprocal effect (RCE) showed that the genetic variability was explained by additive effect. The F1 population showed that there was partial dominance and the narrow sense heritability for severity and AUDPC was high (60%). To improve cowpea for resistance to CABMV, rigorous choice of parents should be made before crosses and there was no maternal effect. Key words: Cowpea, full diallel, severity, resistance, Cowpea aphid-born mosaic virus disease (CABMV), Burkina Faso.
Highlights
The analysis of variance was highly significant for the specific combining ability (SCA) and non-significant for general combining ability (GCA) and reciprocal effect (RCE)
These terms are: 1. The term b1 is the mean deviation of the first generation F1 hybrids relative to the average parent which is highly significant for the severity
The results obtained by the method of Hayman concerning the degree of significance of the dominance effects (SCA) and additive (GCA) are not consistent with those found by Griffing. These results provide the following clarifications: 1. The term b1 which is the mean deviation of F1 as compared to the average parent, is highly significant for area under disease progress curve (AUDPC)
Summary
Walp) is a leguminous crop, self-pollinated, grown in all agro-ecological zones of Burkina Faso and has numerous advantages at both agronomical and economical levels. Its grains constitute an important source of protein and income for producers and consumers. One of the main problems in the genetic improvement of the crop to address is the choice of the parents for hybridization. This choice of parents for hybridization depends, beyond beyond resistance to diverse constraints, heavily on market and consumers’ criteria.
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