Characterization of cowpea genotype resistance to Callosobruchus maculatus

Abstract

-The objective of this work was to characterize the resistance of 50 cowpea (Vigna unguiculata) genotypes to Callosobruchus maculatus. A completely randomized design with five replicates per treatment (genotype) was used. No-choice tests were performed using the 50 cowpea genotypes to evaluate the preference for oviposition and the development of the weevil. The genotypes IT85 F-2687, MN05-841 B-49, MNC99-508-1, MNC99-510-8, TVu 1593, Canapuzinho-1-2, and Sanzi Sambili show non-preference-type resistance (oviposition and feeding). IT81 D-1045 Ereto and IT81 D-1045 Enramador exhibit antibiosis against C. maculatus and descend from resistant genitors, which grants them potential to be used in future crossings to obtain cowpea varieties with higher levels of resistance.

Morpho-genetic variability in F2 progeny cowpea genotypes tolerant to Bruchid (Callosobruchus maculatus)

“…Similarly, dihybrid inheritance analysis of seed coat colour in pooled sampled seeds from both TVu11953 and Ife Brown mother plants also showed a significant deviation from the expected 1:2:1 ratio (Table 4). Cowpeas have been reported to show varied seed coat colours ranging from white to cream to brown to black each controlled by genes with maternal effects (Drabo et al, 1988;de Castro et al, 2013). These authors have showed that five major genes interact to produce ten different seed coat colours in cowpea.…”

Biochemical Basis of Cowpea Resistance to Bruchid, Callosobruchus Maculatus (F.).

“…However, the use of synthetic insecticides to control bruchid infestation has widespread environmental contamination, toxicity to non-target organisms and negative effects on human health (Isman, 2008). The growing concerns about the harmful effects of pesticides have stimulated investigations in new, safer alternative pest control strategies, including the use of resistant genotypes (Castro et al, 2013;Tripathi et al, 2015). An understanding of the mechanisms of resistance to the bruchid is one of the key pre-requisites for designing effective and efficient strategies to breed resistant genotypes.…”

Bromatological characteristics of the cowpea in the resistance to Callosobruchus maculatus

“…Several essays were developed in the scope of identifying the cowpea genotypes resistant to the attack of C. maculatus (Carvalho et al, 2011, Lima et al, 2001 Sci., Bom Jesus, v.10, n.1, p.150-157, Jan./Mar. 2019 Vilarinho 2011, Cajazeira 2000, Melo et al, 2012 without, however, investigating its causes (Castro et al, 2013). In this manner, this study aimed to evaluate the chemical composition of four cowpea cultivars concerning the preference and the development of Callosobruchus maculatus.…”