Eur. J. Entomol. 111 (2): 181-188, 2014 | DOI: 10.14411/eje.2014.022

Inhibitory effects of plant extracts on growth, development and α-amylase activity in the red flour beetle Tribolium castaneum (Coleoptera: Tenebrionidae)

Nujira TATUN1, Boonguea VAJARASATHIRA2, Jatuporn TUNGJITWITAYAKUL1, Sho SAKURAI3
1 School of Science, University of Phayao, Phayao 56000, Thailand; e-mail: nujira.ta@up.ac.th
2 Department of Zoology, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
3 Division of Life Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan

The bioinsecticidal effects of methanolic extracts of the leaves of castor bean, Ricinus communis, and papaya, Carica papaya, on the red flour beetle, Tribolium castaneum, were studied. More specifically, larval weight, larval mortality, percentage pupation, percentage adult emergence and F1 progeny production were recorded. We also studied the effects of the extracts on α-amylase activity and amylase gene expression in T. castaneum. The extracts of R. communis and C. papaya, which were administered in a diet, increased larval mortality and extended the durations of the larval and pupal periods. Feeding them an extract-treated diet also reduced the percentages of larvae that pupated and of adults that emerged and the number of F1 progeny. α-Amylase activity was inhibited and glucose content reduced in the larvae and adults of these insects. This inhibition of α-amylase activity by the R. communis and C. papaya extracts was concentration dependent in vitro. In addition, amylase gene expression was reduced in insects fed a diet containing C. papaya, but not R. communis extract. These results indicate that the bioinsecticidal effects of the leaf extracts are mediated by inhibiting the gene expression and activity of enzymes involved in sugar metabolism.

Keywords: Coleoptera, Tenebrionidae, α-amylase, amylase inhibitor, Carica papaya, Ricinus communis, Tribolium castaneum

Received: September 2, 2013; Accepted: November 15, 2013; Prepublished online: February 25, 2014; Published: May 5, 2014

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