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Pathogenicity and characterization of a novel Bacillus cereus sensu lato isolate toxic to the Mediterranean fruit fly Ceratitis capitata Wied

Ruiu, Luca and Falchi, Giovanni and Floris, Ignazio and Marche, Maria Giovanna and Mura, Maria Elena and Satta, Alberto (2015) Pathogenicity and characterization of a novel Bacillus cereus sensu lato isolate toxic to the Mediterranean fruit fly Ceratitis capitata Wied. Journal of Invertebrate Pathology, Vol. 126 , p. 71-77. ISSN 0022-2011. eISSN 1096-0805. Article.

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DOI: 10.1016/j.jip.2015.01.010

Abstract

The lethal and sub-lethal effects of sporulated cultures of a novel Bacillus cereus sensu lato strain lacking detectable cry genes and identified through morphological and genetic analyses, have been studied on the Mediterranean fruit fly Ceratitis capitata. The lethal effects on young larvae were concentration dependent, with a median lethal concentration (LC50) of 4.48 × 108 spores/g of diet. Sporulated cultures of this strain significantly extended development time and reduced immature survival, and the size of emerging fly adults. Besides spores, the toxicity has been associated to the insoluble extra-spore fraction characterized through a proteomic approach. The profile of the extra-spore protein fraction (ES) showed major protein bands within the 35–65 kDa range. The results of mass spectrometry analysis highlighted the presence of putative virulence factors, including members of protein families previously associated to the insecticidal action of other microbial entomopathogens. These proteins include metalloproteases, peptidases and other enzymes.

Item Type:Article
ID Code:10403
Status:Published
Refereed:Yes
Uncontrolled Keywords:Fruit fly, Tephritidae, bioinsecticide, entomopathogenic bacteria, Bacillus thuringiensis, toxicity
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/11 Entomologia generale e applicata
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Academic Press / Elsevier
ISSN:0022-2011
eISSN:1096-0805
Deposited On:26 Nov 2014 16:49

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