Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Efficiency and Midgut Histopathological Effect of the Newly Isolated Bacillus thuringiensis KS ${\delta}$-Endotoxins on the Emergent Pest Tuta absoluta

  • Jamoussi, Kais (Biopesticides Team (LPAP), Centre of Biotechnology of Sfax, University of Sfax) ;
  • Sellami, Sameh (Biopesticides Team (LPAP), Centre of Biotechnology of Sfax, University of Sfax) ;
  • Nasfi, Zina (Biopesticides Team (LPAP), Centre of Biotechnology of Sfax, University of Sfax) ;
  • Krichen-Makni, Saloua (Laboratory of Pathological Anatomy and Cytology, Habib Bourguiba Hospital) ;
  • Tounsi, Slim (Biopesticides Team (LPAP), Centre of Biotechnology of Sfax, University of Sfax)
  • Received : 2013.01.14
  • Accepted : 2013.03.24
  • Published : 2013.08.28
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Abstract

Tuta absoluta (Povolny, 1994) is a devastating moth to the Solanaceae plants. It is a challenging pest to control, especially on tomatoes. In this work, we studied the entomopathogenic activity of the Cry-forming ${\delta}$-endotoxins produced by Bacillus thuringiensis strain KS and B. thuringiensis kurstaki reference strain HD1 against T. absoluta. These strains carried the cry2, cry1Ab, cry1Aa/cry1Ac, and cry1I genes, and KS also carried a cry1C gene. The ${\delta}$-endotoxins of KS were approximately twofold more toxic against the third instar larvae than those of HD1, as they showed lower 50% and 90% lethal concentrations (0.80 and 2.70 ${\mu}g/cm^2$ (${\delta}$-endotoxins/tomato leaf)) compared with those of HD1 (1.70 and 4.50 ${\mu}g/cm^2$) (p < 0.05). Additionally, the larvae protease extract showed at least six caseinolytic activities, which activated the KS and HD1 ${\delta}$-endotoxins, yielding the active toxins of about 65 kDa and the protease-resistant core of about 58 kDa. Moreover, the histopathological effects of KS and HD1 ${\delta}$-endotoxins on the larvae midgut consisted of an apical columnar cell vacuolization, microvillus damage, and epithelial cell disruption. These results showed that the KS strain could be a candidate for T. absoluta control.

Keywords

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