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• W3130131893 abstract "Callosobruchus chinensis (azuki bean weevil) and Callosobruchus maculatus (cowpea weevil) are the most destructive pests that cause significant losses to cowpea ( Vigna unguiculata ) seeds during storage. Development of cultivar(s) resistance to bruchids is a major goal in cowpea breeding program. Cowpea accession “TVu 2027” has been identified as moderately resistant to C. maculatus . Genetic studies of the seed resistance in this accession using strains of C. maculatus from Africa and America have demonstrated that the resistance is controlled by one or two recessive genes. However, there is no reports on genetics of the resistance to C. chinensis and to strain(s) of C. maculatus from Asia. Therefore, the objective of this study was to investigate genetics of the resistance to C. chinensis and C. maculatus in TVu 2027. TVu 2027 (P 2 ) and PK2015VTN001 (P 1 ; susceptible cowpea) were used to develop six basic generations (populations), viz. P 1 , P 2 , F 1 (P 1 × P 2 ), F 2 (P 1 × P 2 ), BC 1 P 1 (P 1 × F 1 ) and BC 1 P 2 (P 2 × F 1 ). The population were evaluated for percentage of damaged seeds (PDS) and area under the disease progress stairs (AUDPS; indicating infestation severity) by C. chinensis and C. maculatus . The results showed that TVu 2027 was moderately resistant to both bruchid species. Broad-sense heritability for PDS and AUDPS was moderate, being 70% and 73% for C. chinensis, respectively, and 64% and 61% for C. maculatus , respectively. Number of genes controlling C. chinensis resistance and C. maculatus resistance was two genes and one gene, respectively. Generation mean analysis revealed that genes with additive effect and additive × dominance gene interaction are involved in the resistance to both bruchid species. Correlation analysis suggested that the genes controlling resistance to C. chinensis and those conferring resistance to C. maculatus are unlinked. • C. chinensis and C. maculatus are the most serious stored pests of cowpea during storage. • Cowpea “TVu 2027” is known for C. maculatus , but its resistance to C. chinensis is not yet determined. • TVu 2027 showed moderate heritability for resistance to both bruchid species, being about 60–70%. • Small number of genes controlled resistance to C. chinensis and C. maculatus in TVu 2027 • Additive gene effect and additive × dominance gene interaction are involved in the resistance." @default.
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• W3130131893 date "2021-05-01" @default.
• W3130131893 modified "2023-09-26" @default.
• W3130131893 title "Genetic analysis of seed resistance to Callosobruchus chinensis and Callosobruchus maculatus in cowpea" @default.
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• W3130131893 doi "https://doi.org/10.1016/j.jspr.2021.101783" @default.
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