Virus-host coevolution often drives virus immune escape. However, it remains unknown whether natural variations of plant virus resistance are enriched in genes of RNA interference (RNAi) pathway known to confer essential antiviral defense in plants. Here, we report two genome-wide association study screens to interrogate natural variation among wild-collected Arabidopsis thaliana accessions in quantitative resistance to the endemic cucumber mosaic virus (CMV). We demonstrate that the highest-ranked gene significantly associated with resistance from both screens acts to regulate antiviral RNAi in ecotype Columbia-0. One gene, corresponding to Reduced Dormancy 5 (RDO5), enhances resistance by promoting amplification of the virus-derived small interfering RNAs (vsiRNAs). Interestingly, the second gene, designated Antiviral RNAi Regulator 1 (VIR1), dampens antiviral RNAi so its genetic inactivation by CRISPR/Cas9 editing enhances both vsiRNA production and CMV resistance. Our findings identify positive and negative regulators of the antiviral RNAi defense that may play important roles in virus-host coevolution.
|Original language||English (US)|
|State||Published - May 30 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-06
Acknowledged KAUST grant number(s): OSR-2015-CRG4-2647
Acknowledgements: We wish to thank Drs. Daoxin Xie and Xueping Zhou for sharing materials. This project was supported by funding from the Agricultural Experimental Station and College of Natural and Agricultural Sciences, the University of California, Riverside (to S.-W.D.) and by grants from the US-Israel Binational Agricultural Research and Development Fund (no. IS-5027-17C to A.G.O. and S.-W.D.) and Office of Sponsored Research of the King Abdullah University of Science and Technology, Saudi Arabia (no. OSR-2015-CRG4-2647 to Drs. Magdy Mahfouz and S.-W.D.).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)