Distribution of cry1, cry2 and cry5 genes within Bacillus thuringiensis isolates from Spain

Ferrandis M.D., Juarez-Perez Victor-Manuel, Frutos Roger, Bel Y., Ferré J.. 1999. Distribution of cry1, cry2 and cry5 genes within Bacillus thuringiensis isolates from Spain. Systematic and Applied Microbiology, 22 : 179-185.

Autre titre : Distribution des gènes cry1, cry2 et cry5 des isolats espagnols de Bacillus thuringiensis

Résumé : Using a PCR-based approach, a collection of 223 isolares of Bacillits tburingiensis from Spain was screened for the presence of cry genes belonging to three families. Genes from the cryI, cryII and cryV families were found in 54%, 42%, and 66% of the isolates, respectively. Only 23% of the isolates did not show the presence of any of the genes tested. Frequencies of these genes were compared in isolates from soil samples and from samples of cereal stores and mills, being this higher in the latter. Specific primers were used to detect cryIA(a), cryIA(b), cryIA(c), cryIA(d), cryIA(e), cryIB, cryIc, cryID, cryIE, cryIF and cryIG genes. Within the cryl family, the most frequent gene was cryIA(c) (62%), followed by cryIA(a), cryID, cryIC and cryIA(b) (49, 43, 35, and 34%, respectively). A high frequency of joint occurrence was observed for cryIC and cryID; the latter was present in 93% of the isolates containing cryIC. A random sample of 97 isolates was tested for toxicity against the insect pests Plutella xylostella and Spodoptera exigua. Among the isolates showing toxicity, the most common gene combination was cryIA-cryIC-cryID-cryII-cryV. Although in most cases toxicity could be related to gene content, in some others toxicity was unexpected according to the results obtained by PCR. We found no apparent relationship between gene content in our isolates and the serovar to which they belong.

Mots-clés Agrovoc : Bacillus thuringiensis, gène, toxine bactérienne, pesticide bactérien, insecticide, carte génétique, PCR, technique analytique

Mots-clés géographiques Agrovoc : Espagne

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

• Ferrandis M.D.
• Juarez-Perez Victor-Manuel
• Frutos Roger, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
• Bel Y.
• Ferré J.

Source : Cirad - Agritrop (https://agritrop.cirad.fr/392094/)

Métriques

[ Page générée et mise en cache le 2024-04-06 ]