Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français fr
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-04-15

ASSESSING THE RISKS INVOLVED IN THE RELEASE OF GENETICALLY MANIPULATED MICROORGANISMS

Objectif

MICROORGANISMS DELIBERATELY RELEASED INTO THE ENVIRONMENT AFTER RIGOROUS TESTING ARE UNLIKELY TO PROVE A DIRECT THREAT (I.E. PATHOGENS), AND PREDICTION OF SUCH RISKS IS ALMOST IMPOSSIBLE. HOWEVER, THE MAIN RISK IS THE PROSPECT OF CREATING POTENTIALLY HAZARDOUS NEW ORGANISMS FOLLOWING THE TRANSFER OF MOBILE GENES TO NATIVE BACTERIA. MANY BACTERIA CAN EXCHANGE GENETIC MATERIAL, INCLUDING PLASMIDS AND TRANSPOSONS; THEREFORE THE PERSISTENCE AND SPREAD OF BOTH THE ORGANISMS AND GENES ARE BOTH IMPORTANT AND WOULD BE AFFECTED BY A VARIETY OF SELECTIVE PRESSURES.

THIS STUDY IS EXPECTED TO GIVE FURTHER IMPORTANT INFORMATION ABOUT THE GENETICS AND GENE TRANSFER MECHANISM OF THE MICROORGANISM RHIZOBIUM WHICH IS TO BE SELECTED, AFTER APPROPRIATE MODIFICATION OF ITS GENOME, FOR THE INOCULATION OF LEGUMINOUS PLANTS.

THE METHODOLOGY DEVELOPED IN ORDER TO FOLLOW THE PERSISTENCE OF SPECIFIC STRAIN IN THE SOIL WILL BE OF PARTICULAR INTEREST FOR EVALUATING THE SPREADING OF GENETICALLY ENGINEERED IN THE ENVIRONMENT.
To investigate survival of introduced strains and their genes and to develop and assess monitoring methods, genetically marked derivatives of 2 common soil bacteria were used: Rhizobium which fixes atmospheric nitrogen in the root nodules of legumes (and has a long history) of safe and effective use as an agricultural inoculant) was used in both field and laboratory experiments; Enterobacter agglomerans which fixes nitrogen in association with cereal roots was studied in the laboratory. Strains were marked with genes conferring antibiotic resistance, either by selecting naturally occurring chromosomal mutations, or by insertion of transposon Tn5 to conjugative plasmids. In addition, native Rhizobium populations were screened for circumstantial evidence that genetic exchange occurs (over a long period) in the environment.

The Tn5 marker enabled extensive monitoring of the Rhizobium inoculant, which showed significant variation in survival in field soils of the collaborating countries. The host plant was not required for its establishment. Spread from the site of application over short distances indicated migration along extending roots; over moderate distances it was associated with standing surface water; and over greater areas by bulk soil movement. In the field, no Tn5 transfer to other Rhizobium (isolated from nodules) was found, although populations were below the level at which transfer could be detected in the laboratory. In culture, the inoculant could transfer Tn5 to Escherichia coli and E agglomerans, in addition to a range of Rhizobium species (in contrast to E agglomerans which transferred its plasmid only to closely related strains). Field populations of Rhizobium showed considerable evidence that genetic exchange between soil bacteria must occur in the long term.
THIS RESEARCH AIMS AT STUDYING THE PERSISTENCE IN AGRICULTURAL SOIL OF GENETICALLY MODIFIED BACTERIA AND THE SPREADING OF GENES CARRIED BY THESE BACTERIA TO OTHER SOIL MICROORGANISMS. THE COLLABORATIVE EFFORT (COMPRISING TWO OTHER EUROPEAN LABORATORIES) WILL BE CENTERED ON THE UTILIZATION OF DIFFERENT RHIZOBIUM SPECIES, TO BE RELEASED INTO THE FIELD. R.LEGUMINOSARUM WILL BE CHOSEN IN THIS STUDY.
AIM OF THE PROJECT IS TO INOCULATE PEAS WITH RHIZOBIUM STRAINS HAVING MARKER GENES AND FOLLOW THEIR PERSISTENCE AFTER APPLYING SELECTIVE PRESSURE FOR LONG TIME PERIODS.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Données non disponibles

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

Institut National de la Recherche Agronomique
Contribution de l’UE
Aucune donnée
Adresse
Rue de Sully
21034 Dijon
France

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (2)

Mon livret 0 0