The damage caused by Callosobruchus maculatus on cowpea grains is dependent on the plant genotype

Journal of the Science of Food and Agriculture
Elida Barros TorresBruno E Pavan

Abstract

Beans from cowpea cultivars fertilized with mineral N or inoculated with various rhizobium strains may contain different nitrogen concentrations and nitrogen metabolite composition, which affects the beans' defense mechanisms against pests. In this study, the population growth of Callosobruchus maculatus reared on beans from four cowpea cultivars fertilized with different nitrogen sources was evaluated. The factors tested were beans from four cowpea cultivars and seven different nitrogen sources: mineral N fertilization, inoculation with five strains of symbiotic diazotrophic bacteria, and soil nitrogen (absolute control). BRS Tapaihum and BRS Acauã cultivars had lower cumulative emergence and instantaneous rate of population growth of the insects compared with other cultivars, indicating antixenosis resistance against C. maculatus. Inoculation of BRS Acauã cultivar with the diazotrophic bacteria strain BR 3299 resulted in higher mortality of C. maculatus. For BRS Tapaihum cultivar, inoculation with diazotrophic bacteria strains BR3267, BR 3262 and BR 3299, and nitrogen fertilization resulted in higher mortality among C. maculatus. BRS Tapaihum and BRS Acauã cultivars showed the lowest cumulative insect emergence and instantane...Continue Reading

References

Nov 14, 2013·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Gabriel B OliveiraCarlos P Silva
Aug 1, 2003·Functional Plant Biology : FPB·Patrick A Ndakidemi, Felix D Dakora

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