Inducible expression of a fusion gene encoding two proteinase inhibitors leads to insect and pathogen resistance in transgenic rice

Quilis Jordi, López-García Belén, Meynard Donaldo, Guiderdoni Emmanuel, San Segundo Blanca. 2014. Inducible expression of a fusion gene encoding two proteinase inhibitors leads to insect and pathogen resistance in transgenic rice. Plant Biotechnology Journal, 12 (3) : 367-377.

Quartile : Outlier, Sujet : PLANT SCIENCES / Quartile : Q1, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Résumé : Plant proteinase inhibitors (PIs) are considered as candidates for increased insect resistance in transgenic plants. Insect adaptation to PI ingestion might, however, compromise the benefits received by transgenic expression of PIs. In this study, the maize proteinase inhibitor (MPI), an inhibitor of insect serine proteinases, and the potato carboxypeptidase inhibitor (PCI) were fused into a single open reading frame and introduced into rice plants. The two PIs were linked using either the processing site of the Bacillus thuringiensis Cry1B precursor protein or the 2A sequence from the foot-and-mouth disease virus (FMDV). Expression of each fusion gene was driven by the wound- and pathogen-inducible mpi promoter. The mpi-pci fusion gene was stably inherited for at least three generations with no penalty on plant phenotype. An important reduction in larval weight of Chilo suppressalis fed on mpi-pci rice, compared with larvae fed on wild-type plants, was observed. Expression of the mpi-pci fusion gene confers resistance to C. suppressalis (striped stem borer), one of the most important insect pest of rice. The mpi-pci expression systems described may represent a suitable strategy for insect pest control, better than strategies based on the use of single PI genes, by preventing insect adaptive responses. The rice plants expressing the mpi-pci fusion gene also showed enhanced resistance to infection by the fungus Magnaporthe oryzae, the causal agent of the rice blast disease. Our results illustrate the usefulness of the inducible expression of the mpi-pci fusion gene for dual resistance against insects and pathogens in rice plants.

Mots-clés Agrovoc : Oryza sativa, résistance génétique, résistance aux maladies, résistance aux organismes nuisibles, plante transgénique, fusion de gènes, génie génétique, expression des gènes, protéase, inhibiteur d'enzyme, Chilo suppressalis, Magnaporthe, Solanum tuberosum, Zea mays

Mots-clés complémentaires : Magnaporthe oryzae

Classification Agris : F30 - Génétique et amélioration des plantes
H10 - Ravageurs des plantes
H20 - Maladies des plantes
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Quilis Jordi, CRAG (ESP)
• López-García Belén, CRAG (ESP)
• Meynard Donaldo, CIRAD-BIOS-UMR AGAP (FRA)
• Guiderdoni Emmanuel, CIRAD-BIOS-UMR AGAP (FRA)
• San Segundo Blanca, Max Planck Institute of Molecular Plant Physiology (DEU)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573266/)

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