Occurrence and Linkage Between Secreted Insecticidal Toxins in Natural Isolates of Bacillus thuringiensis | Zendy

Sylvain Espinasse | Zendy; Josette Chaufaux | Zendy; Christophe Buisson | Zendy; Stéphane Perchat | Zendy; Michel Gohar | Zendy; Denis Bourguet | Zendy; Vincent Sanchis | Zendy

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Occurrence and Linkage Between Secreted Insecticidal Toxins in Natural Isolates of Bacillus thuringiensis

Author(s) -

Sylvain Espinasse,

Josette Chaufaux,

Christophe Buisson,

Stéphane Perchat,

Michel Gohar,

Denis Bourguet,

Vincent Sanchis

Publication year - 2003

Publication title -

current microbiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.578

H-Index - 90

eISSN - 1432-0991

pISSN - 0343-8651

DOI - 10.1007/s00284-003-4097-2

Subject(s) - bacillus thuringiensis , exotoxin , spodoptera littoralis , biology , lepidoptera genitalia , virulence , toxin , microbiology and biotechnology , spodoptera , bacillaceae , gene , botany , bacteria , noctuidae , genetics , recombinant dna , bacillus subtilis

Little is known about the occurrence and linkage between secreted insecticidal virulence factors in natural populations of Bacillus thuringiensis (Bt). We carried out a survey of 392 Bt strains isolated from various samples originating from 31 countries. The toxicity profile of the culture supernatants of these strains was determined individually against Anthonomus grandis (Coleoptera) and Spodoptera littoralis (Lepidoptera). We analyzed beta-exotoxin I production and searched for the genes encoding Vip1-2, Vip3, and Cry1I toxins in 125 of these strains. Our results showed that these insecticidal toxins were widespread in Bt but that their distribution was nonrandom, with significant linkage observed between vip3 and cry1I and between vip1-2 and beta-exotoxin I. Strains producing significant amounts of beta-exotoxin I were more frequently isolated from invertebrate samples than from dust, water, soil, or plant samples.

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