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Selection of Bacillus thuringiensis strains in citrus and their pathogenicity to Diaphorina citri (Hemiptera: Liviidae) nymphs

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Insect Science 2020年第3期27卷 519-530页

作者： Silvia de Oliveira Dorta Juliana Balbinotte Rose Monnerat Joao Roberto Spotti Lopes Tatiane da Cunha Odimar Zanuzo Zanardi Marcelo Pedreira de Miranda Marcos Antonio Machado Juliana de Freitas-Astua Programs de Pos-Graduagao em Microbiologia Agricola Escola Superior de Agricultura Luiz de QueirozUniversidade de Sao PauloPiracicabaSPBrazil Laboratorio de Biotecnologia Centro de Citricultura Sylvio MoreiraInstituto Agronomico de CampinasCordeiropolisSPBrazil Laboratorio de Insetos Vetores de Fitopatdgenos Departamento de Entomologia e AcarologiaEscola Superior de Agricultura Luiz de QueirozUniversidade de Sao PauloPiracicabaSPBrazil Embrapa Recursos Geneticos e Biotecnologia BrasiliaDFBrazil Fundo de Defesa da Citricultura(Fundecitrus) AraraquaraSPBrazil Embrapa Mandioca e Fruticultura Cruz das AlmasBABrazil Laboratdrio de Bioquimica Fitopatoldgica Instituto BioldgicoSao PauloSPBrazil

Bacillus thuringiensis(Bt)toxins are effective in controlling insect pests either through the spraying of products or when expressed in transgenic *** discovery of endophytic Bt strains opened new perspectives for studies aimed at the control of sap‐sucking insects,such as the Asian citrus psyllid Diaphorina citri Kuwayama(Hemiptera:Liviidae),a vector of“Candidatus Liberibacter spp.,”associated with citrus huanglongbing(HLB).In this study,translocation of endophytic Bt strains in citrus seedlings inoculated with Bt suspension delivered by soil‐drench,and their systemic pathogenicity to *** nymphs were *** pathogenicity of three wild‐type Bt strains against *** third‐instar nymphs was *** the 10 recombinant strains tested(each of them harboring a single cry or cyt gene),3 can be highlighted,causing 42%–77%and 66%–90%nymphal mortality at 2 and 5 d after inoculation,*** isolation of Bt cells from young citrus shoots and dead nymphs,and PCR performed with specific primers,confirmed the involvement of the Bt strains in the psyllid *** is the first report showing the translocation of Bt strains from citrus seedling roots to shoots and their potential to control *** nymphs that fed on these soil‐drench inoculated *** Bt strains that caused the highest mortality rates have the potential to be used as bioinsecticides to control *** and the identified genes can be used for the production of transgenic Bt citrus.

关键词： Asian citrus psyllid Citrus sinensis cry toxins endophytic Bt huanglongbing young shoots

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Effects and mechanisms of Bacillus thuringiensis crystal toxins for mosquito larvae

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Insect Science 2017年第5期24卷 714-729页

作者： Qi Zhang Gang Hua Michael J. Adang College of Plant Protection Shenyang Agricultural University Shenyang China Department of Entomology University of GeorgiaAthens GA USA Department of Biochemistry & Molecular Biology University of Georgia Athens GA USA

Bacillus thuringiensis is a Gram-positive aerobic bacterium that produces insecticidal crystalline inclusions during sporulation phases of the mother cell. The vir- ulence factor, known as parasporal crystals, is composed of cry and Cyt toxins. Most cry toxins display a common 3-domain topology. cry toxins exert intoxication through toxin activation, receptor binding and pore formation in a suitable larval gut environment. The mosquitocidal toxins of Bt subsp, israelensis （Bti） were found to be highly active against mosquito larvae and are widely used for vector control. Bt subsp, jegathesan is another strain which possesses high potency against broad range of mosquito larvae. The present review summarizes characterized receptors for cry toxins in mosquito larvae, and will also discuss the diversity and effects of 3-D mosquitocidal cry toxin and the ongo- ing research for cry toxin mechanisms generated from investigations of lepidopteran and dipteran larvae.

关键词： Bacillus thuringiensis cry toxins mode of action mosquito receptors

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