# Durable Management of Plant Viruses: Insights into Host Resistance and Tolerance Mechanisms

## TL;DR

This review explores how plants defend against viruses and how these defenses can be used to develop crops with long-lasting resistance.

## Contribution

The paper provides a comprehensive synthesis of antiviral resistance and tolerance mechanisms in plants, with a focus on BYDV in cereals.

## Key findings

- Plants use multiple defense layers, including RNA silencing and hormone-regulated signaling, to combat viruses.
- Breeding and biotechnology strategies like CRISPR and RNAi can enhance durable resistance in crops.
- Integrated approaches combining genetic resistance with surveillance and vector control improve long-term protection.

## Abstract

Plant viruses pose a serious threat to food security and greatly reduce agricultural productivity worldwide. Plants rely on complex defense mechanisms to combat viral infections, and both transgenic and non-transgenic strategies are employed in resistance breeding. Modern technologies offer new ways to disrupt virus–plant compatibility. A deeper understanding of these systems supports the sustainable development of crops with durable resistance to viral diseases.

Plant viruses cause substantial yield and quality losses worldwide, and their rapid evolution can erode deployed host resistance. This review synthesizes current knowledge of antiviral resistance and tolerance mechanisms, using barley yellow dwarf virus (BYDV) in cereals as an illustrative case study. We first summarize key layers of plant antiviral immunity, including pre-formed physical and chemical barriers, dominant and recessive resistance genes, RNA silencing, hormone-regulated defense signaling, and degradation pathways such as the ubiquitin–proteasome system and selective autophagy. We then discuss how these mechanisms are exploited in breeding and biotechnology, covering conventional introgression, marker-assisted selection, QTL mapping and pyramiding, induced variation (mutation breeding and TILLING/ecoTILLING), transgenic strategies (pathogen-derived resistance and plantibodies), RNA interference-based approaches, and CRISPR-enabled editing of susceptibility factors. Finally, we highlight emerging nano-enabled tools and propose integrated strategies that combine genetic resistance with surveillance and vector management to improve durability under climate change and ongoing viral diversification.