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

Autor: Torres EB; Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil., Nóbrega RS; Agricultural, Environmental and Biological Sciences Center, Federal University of Recôncavo da Bahia, Cruz das Almas, Bahia, Brazil., Fernandes-Júnior PI; Embrapa Semiárido, Petrolina, Pernambuco, Brazil., Silva LB; Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil., Dos Santos Carvalho G; Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil., Marinho Rde C; Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil., Pavan BE; Agronomy Department, UNESP, Campus de Ilha Solteira, Sao Paulo, Brazil.
Jazyk: angličtina
Zdroj: Journal of the science of food and agriculture [J Sci Food Agric] 2016 Sep; Vol. 96 (12), pp. 4276-80. Date of Electronic Publication: 2016 Apr 05.
DOI: 10.1002/jsfa.7639
Abstrakt: Background: 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).
Results: 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.
Conclusion: BRS Tapaihum and BRS Acauã cultivars showed the lowest cumulative insect emergence and instantaneous rates of population growth, and the highest insect mortality, mainly when the grains were obtained from plants inoculated with rhizobial strains. © 2016 Society of Chemical Industry.
(© 2016 Society of Chemical Industry.)
Databáze: MEDLINE
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