# Transcriptional Comparison Reveals Differential Resistance Mechanisms between CMV-Resistant PBC688 and CMV-Susceptible G29

## TL;DR

This study compares gene activity in pepper plants that resist and are susceptible to a virus, revealing different resistance mechanisms.

## Contribution

The study identifies specific gene expression patterns and pathways linked to resistance in CMV-resistant pepper plants.

## Key findings

- PBC688 suppresses CMV proliferation, while G29 allows higher viral accumulation.
- CMV resistance in PBC688 involves ribosomal and chlorophyll-binding proteins, unlike G29.
- Ethylene and abscisic acid signaling pathways are linked to CMV resistance in peppers.

## Abstract

The Cucumber mosaic virus (CMV) presents a significant threat to pepper cultivation worldwide, leading to substantial yield losses. We conducted a transcriptional comparative study between CMV-resistant (PBC688) and -susceptible (G29) pepper accessions to understand the mechanisms of CMV resistance. PBC688 effectively suppressed CMV proliferation and spread, while G29 exhibited higher viral accumulation. A transcriptome analysis revealed substantial differences in gene expressions between the two genotypes, particularly in pathways related to plant–pathogen interactions, MAP kinase, ribosomes, and photosynthesis. In G29, the resistance to CMV involved key genes associated with calcium-binding proteins, pathogenesis-related proteins, and disease resistance. However, in PBC688, the crucial genes contributing to CMV resistance were ribosomal and chlorophyll a–b binding proteins. Hormone signal transduction pathways, such as ethylene (ET) and abscisic acid (ABA), displayed distinct expression patterns, suggesting that CMV resistance in peppers is associated with ET and ABA. These findings deepen our understanding of CMV resistance in peppers, facilitating future research and variety improvement.