Indica rice cultivar IRGA 424, Ttansformed with cry genes of B. thuringiensis, provided High resistance against Spodoptera frugiperda (Lepidoptera: Noctuidae)

Pinto Laura Massochin Nunes, Fiuza Lidia Mariana, Ziegler Denize, De Oliveira Jaime Vargas, Menezes Valmir Gaedke, Bourrié Isabelle, Meynard Donaldo, Guiderdoni Emmanuel, Breitler Jean-Christophe, Altosaar Illimar, Gantet Pascal. 2013. Indica rice cultivar IRGA 424, Ttansformed with cry genes of B. thuringiensis, provided High resistance against Spodoptera frugiperda (Lepidoptera: Noctuidae). Journal of Economic Entomology, 106 (6) : 2585-2594.

Quartile : Q1, Sujet : ENTOMOLOGY

Résumé : Plant expression of the entomopathogenic bacteria Bacillus thuringiensis cry gene has reduced the damage created by insect pests in several economically important cultures. For this study, we have conducted genetic transformation of the indica rice 'IRGA 424,' via Agrobacterium tumefaciens, using the B. thuringiensis cry1Aa and cry1B genes, with the objective of obtaining rice plants resistant to the insect pests from this culture. The gene constructions harbor the promoters maize proteinase inhibitor and ubiquitin. The results showed that high concentration of the hormone 2,4-dichlorophenoxyacetic acid and agarose as the gelling agent helped the production of embryogenic calli for the analyzed cultivar. More than 80% of the obtained transformed plants revealed the integration, using polymerase chain reaction, of the cry1Aa and cry1B genes. Analysis of the expression of the heterologous protein by Western blotting revealed the expression of the Cry1B ?elta-endotoxin in IRGA 424 plants transformed with the ubiquitin promoter. Data showed the production and dissemination of a high number of embryogenic calli in addition to obtaining plants transformed with the cry1Aa and cry1B genes until the reproductive phase. The feed bioassays with the transformed plants and Spodoptera frugiperda (JE Smith) larvae indicated high rates of mortality to the insect target. The highest corrected mortality rate achieved under laboratory conditions with Bt-rice plants transformed with the cry1B and cry1Aa genes was 94 and 84%, respectively. Thus, our results demonstrated the great potential of transformed Bt-rice plants in controlling the damage caused by these insect pests in rice paddy fields.

Mots-clés Agrovoc : Oryza sativa, Spodoptera frugiperda, transformation génétique, Bacillus thuringiensis, plante transgénique, résistance aux organismes nuisibles, lutte anti-insecte, variété

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Paddy

Classification Agris : H10 - Ravageurs des plantes
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Pinto Laura Massochin Nunes, Universidade do Vale do Rio dos Sinos (BRA)
• Fiuza Lidia Mariana, Universidade do Vale do Rio dos Sinos (BRA)
• Ziegler Denize, Universidade do Vale do Rio dos Sinos (BRA)
• De Oliveira Jaime Vargas, IRGA (BRA)
• Menezes Valmir Gaedke, IRGA (BRA)
• Bourrié Isabelle, UM2 (FRA)
• Meynard Donaldo, CIRAD-BIOS-UMR AGAP (FRA)
• Guiderdoni Emmanuel, CIRAD-BIOS-UMR AGAP (FRA)
• Breitler Jean-Christophe, CIRAD-BIOS-UMR AGAP (FRA)
• Altosaar Illimar, University of Ottawa (CAN)
• Gantet Pascal, UM2 (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/572682/)

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