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Content archived on 2024-04-30

Development of improved strategies for the control of faba bean necrotic yellows virus - fbnyv - in food legume crops of West Asia and North Africa

Objective

The main objectives are as follows:
* To conduct field studies of FBNYV build-up and spread in Egypt and Syria to obtain a better understanding of the factors involved in virus survival and spread under field conditions.
* To develop screening methods which will permit the precise determination of virus resistance levels in the existing faba bean, chickpea and lentil germplasm.
* To determine the incidence, distribution and variability of FBNYV in countries of West Asia and North Africa (WANA) by providing diagnostic tools to collaborators of the existing ICARDA network.
* To characterize the FBNYV genome by infectivity tests, by determining FBNYV gene functions and variability as well as by testing in vitro engineered replicase-associated protein (Rep) variants of FBNYV in a single cell-based replication assay for their capacity to inhibit the replication of wild-type FBNYV.
* To use in vitro engineered Rep genes for generating transgenic faba bean plants and determine the levels of virus resistance in these lines.
Expected Outcome

The work carried out in this project should provide an updated overview on the incidence, distribution and variability of FBNYV in WANA countries and give a better understanding of FBNYV ecology and epidemiology. This information will be essential for devising agricultural practices for FBNYV control. Improvement of the screening methodology and evaluation of FBNYV resistance in available germplasm will lead to the use of host resistance to FBNYV as another means of conventional control. The analysis of the FBNYV gene functions and variability and the design of defective interfering Rep protein variants will hopefully lead to the generation of transgenic faba bean plants with high levels of FBNYV resistance. The project will thus contribute to sustainable agricultural production in countries of West Asia and North Africa (WANA) through appropriate use of agricultural practices, resistant genotypes and transgenic plants.
The key activities envisaged are:
* Epidemiological and ecological studies to obtain a better understanding of the incidence, distribution and variability of FBNYV in WANA countries and the factors involved in FBNYV epidemics under field conditions.
* Development of improved screening methods for locating and evaluating virus resistance in the existing faba bean, chickpea and lentil germplasm under greenhouse and field conditions.
* Following analysis of the functions and variability of the FBNYV genes, infectivity tests with purified FBNYV particles and various combinations of cloned viral DNA components will be conducted using biolistic bombardment of faba bean seedlings. A system for FBNYV replication in suspension culture cells will be established for testing defective interfering Rep protein functions.
* Gene cassettes suitable for the transformation of faba bean will be constructed, and transformed faba bean lines will be generated and evaluated.

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Topic(s)

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Coordinator

BUNDESBIOLOGISCHEFORSCHUNGSANSTALT FUER LANDWIRSCHAFT UND FORST
EU contribution
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Address
19,Köningin-Luise-straße 19
14195 BERLIN
Germany

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Total cost

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Participants (4)

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