ID | 55725 |
FullText URL | |
Author |
Hayakawa, Tohru
Graduate School of Natural Science and TechnologyOkayama University
Yoneda, Naoya
Graduate School of Natural Science and TechnologyOkayama University
Okada, Kouji
Graduate School of Natural Science and TechnologyOkayama University
Higaki, Ayuko
Graduate School of Natural Science and TechnologyOkayama University
Mohammad Tofazzal Hossain Howlader
Graduate School of Natural Science and TechnologyOkayama University
Ide, Toru
Graduate School of Natural Science and TechnologyOkayama University
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Abstract | A 2,175-bp modified gene (cry11Ba-S1) encoding Cry11Ba from Bacillus thuringiensis subsp. jegathesan was designed and the recombinant protein was expressed as a fusion protein with glutathione S-transferase in Escherichia coli. The recombinant Cry11Ba was highly toxic against Culex pipiens mosquito larvae, being nine and 17 times more toxic than mosquitocidal Cry4Aa and Cry11Aa from Bacillus thuringiensis subsp. israelensis, respectively. Interestingly, a further increase in the toxicity of the recombinant Cry11Ba was achieved by mixing with Cry4Aa, but not with Cry11Aa. These findings suggested that Cry11Ba worked synergistically with Cry4Aa, but not with Cry11Aa, in exhibiting toxicity against C. pipiens larvae. On the other hand, the amount of Cry toxin bound to brush border membrane vesicles (BBMVs) did not significantly change between individual toxins and the toxin mixtures, suggesting that the increase in toxins binding to BBMVs was not a reason for the observed synergistic effect. It is generally accepted that synergism of toxins is a potentially powerful tool for enhancing insecticidal activity and managing Cry toxin resistance in mosquitoes. The mixture of Cry4Aa and Cry11Ba in order to increase toxicity would be very valuable in terms of mosquito control.
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Keywords | Cry toxin
Synergistic toxicity
Insect pest control
Biological control
Disease vector
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Note | This is an Accepted Manuscript of an article published by Springer Nature
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Published Date | 2017-02
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Publication Title |
Applied Entomology and Zoology
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Volume | volume52
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Issue | issue1
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Publisher | Springer Japan
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Start Page | 61
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End Page | 68
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ISSN | 0003-6862
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NCID | AA00543238
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Content Type |
Journal Article
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language |
English
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OAI-PMH Set |
岡山大学
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File Version | author
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DOI | |
Web of Science KeyUT | |
Related Url | isVersionOf https://doi.org/10.1007/s13355-016-0454-z
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