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Jeff Ellis and his group were among the first to clone and characterise plant disease resistance genes and describe their products as a new class of nucleotide binding site-leucine rich repeat proteins.
His laboratory developed the tagging system that led to the cloning of the L6 and M rust resistance genes in 1994 and 1997. L6 was one of the first cloned R genes. Since that time, the group has isolated a number of further genes that control other rust resistance specificities and have investigated the molecular basis of gene-for-gene resistance specificity through the study of chimeric L alleles in transgenic flax.
Ellis and his research team remain one of the leading laboratories in plant disease resistance research. In the 2000s they isolated and characterised the flax rust avirulence genes that correspond to the flax L5, L6, L7 and M resistance genes and using yeast two hybrid analysis, demonstrated that there is direct interaction between L6 and AvrL567 proteins. Much of this work focused on the molecular basis of resistance gene specificity and on evolution of new specificities. It revealed that two regions of the resistance proteins were important for the specificity of recognition of strains of plant pathogens.
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