Objective
Characterization of plant resistance genes have significantly advanced our understanding of plant-pathogen relationships. This raises the possibility to engineer new resistance specificities or broad range resistance through the manipulation of the resistance gene product or its functional pathway. Very little is known about the nature and function of recessive genes that provide highly effective and durable resistance through the suppression of virus replication or movement, in the absence of tissue necrosis. Peas contain clustered recessive resistance genes effective against a range of potyviruses. The most studied of these are the sbm genes that confer specific resistance against different pea seed-born mosaic virus (PSbMV) pathotypes. Resistance gene sbm-l is of commercial interest for its effectiveness against the most common PSbMV pathotype (P-1). The genetic organization of the sbm-associated clusters suggests that gene-duplication, genetic translocation and functional diversification has occurred leading to the range of potyvirus resistances. Hence, knowledge of the basis of sbm phenotype could provide a route to a common resistance strategy for this large and important group of viruses.
Unfortunately map-based cloning in pea has yet to be established and, at this time, would be unlikely to be successful within a three year EU Biotechnology Project. In this project we propose to use biochemical, and molecular biological techniques to:
. isolate and characterise the sbm-l resistance product, or its dominant counterpart (Sbm-l), and use that information to isolate the resistance gene.
. characterise the sbm resistance mechanism and test whether the same principle operates for the neighbouring potyvirus resistances in the pea genome.
We have already identified the protein, VPg, determining pathotype in PSbMV, i.e. the virus protein that probably interacts with the Sbm-l gene product. VPg is integral to viral RNA replication, and preliminary data indicate that PSbMV does not replicate in cells of the resistant plants. VPg will be used to probe for interacting plant factors by means of the yeast two-hybrid system and protein-protein affinity techniques. The biological activity of the potential Sbm-l genes will be verified by transformation of pea.
The use of the resistance genes lies beyond the scope of the proposed three year project but results are expected to contribute to the platform of understanding leading to the next generation of potyvirus resistant plants.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences biological sciences microbiology virology
- natural sciences biological sciences biochemistry biomolecules proteins
- natural sciences biological sciences genetics RNA
- natural sciences biological sciences genetics genomes
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Coordinator
2800 Lyngby
Denmark
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