A non-host of a plant virus showing only apparent extreme resistance

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 (Brassica carinata) to a certain strain of Turnip mosaic virus is only apparent, since it is possible to detect replicative virus infecting systemically, and the identification of the viral determinant of the resistance, provided that the appropriate technology is deployed. This work opens the door to the possibility of other instances of apparent immunity in different virus/non-host combinations.

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Original Paper:

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".

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