The deployment of viruses producing a fluorescent protein, and chimeric recombinant viruses have allowed the detection of systemic replicative viruses and the identification of the viral determinant of the apparent extreme resistance in a presumed non-host of the virus. The work has been carried out in the ‘Plant Virus Biotechnology’ group of the CBGP.
Non-host virus resistance in plants has been classically considered as the virus inability to establish a systemic infection, not even to reach detectable titers in the inoculated leaves. This non-host resistance has been often equated with a complete immunity or extreme resistance.
The work by the CBGP ‘Plant Virus Biotechnology’ group has now shown that the presumed extreme resistance of Ethiopian mustard (
Sardaru, P; Sinausía, L; López-González, S; Zindovic, J; Sánchez, F; Ponz, F. 2018. "The apparent non-host resistance of Ethiopian mustard to a radish-infecting strain of Turnip mosaic virus is largely determined by the C-terminal region of the P3 viral protein". Molecular Plant Pathology. DOI: 10.1111/mpp.12674".