Cucumber green mottle mosaic virus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA454023 | ENA |
REPOSITORIES: ENA
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Project description:Plant viruses are a major threat for a wide range of host species, causing substantial losses in agriculture. Particularly, Cucumber mosaic virus (CMV) evokes severe symptoms, thus dramatically limiting yield. Activation of plant immunity is associated with changes in the gene expression and consequently, cellular proteome to ensure virus resistance. Proteomics proved to be an extremely valuable tool for discovering multiple targets for the rational design of plant protection strategies. Herein, we studied two cultivars of cucumber (Cucumis sativus) resistant ´Heliana´ and susceptible ´Vanda´. Plant cotyledons were mechanically inoculated with CMV isolate PK1, and systemic leaves were harvested at 33 days post-inoculation. Upon protein extraction and filter-aided sample preparations, peptides were profiled by ultrahigh-performance liquid chromatography and comprehensively quantified by ion mobility enhanced mass spectrometry. From 1,516 reproducibly quantified proteins using label-free approach, 133 were differentially abundant among genotypes or treatments by strict statistic and effect size criteria. Pigments and hydrogen peroxide measurements corroborated proteomic findings. Advanced bioinformatics revealed a modular network of affected host proteins. Direct comparison of both genotypes in the uninfected state highlighted more abundant photosynthetic and development-related proteins in resistant cucumber cultivar. Long-term CMV infection showed worse preservation of energy processes and less robust translation in susceptible cultivar versus resistant genotype. Contrary, susceptible cultivar had numerous more abundant stress and defense-related proteins. We proposed promising targets for functional validation in transgenic lines a step toward durable virus resistance in cucurbits and other crops.
2020-01-09 | PXD015088 | Pride
Project description:Cucumber green mottle mosaic virus (CGMMV) is a severe threat to melon production worldwide. At present, there are no cultivars available on the market which show an effective resistance or tolerance to CGMMV infection; only wild Cucumis species were reported as resistant. Germplasm accessions of Cucumis melo, as well as C. anguria, C. ficifolius, C. myriocarpus and C. metuliferus, were mechanically infected with isolates belonging to the European and Asian strain of CGMMV and screened for resistance by scoring symptom severity and comparing the accumulation of virus by qRT-PCR. The wild species C. anguria and C. ficifolius showed no symptoms and did not accumulate CGGMV following inoculation, while C. metuliferus was highly susceptible to the isolates of both strains of CGMMV. The virus accumulated also in C. myriocarpus and the European isolate produced symptoms, but the Asian isolate did not. Thirty C. melo accessions were susceptible to CGMMV. An isolate-dependent expression of symptoms was observed in 16 melon accessions: they showed mild and severe symptoms at 14 and 21 days after inoculation with the European and Asian isolate, respectively. Freeman's Cucumber showed few or no symptoms following inoculation with the isolate of either CGMMV strain. This particular accession also showed reduced virus accumulation, whereas most other tested germplasm accessions showed significantly higher viral loads and, therefore, may well be a candidate for breeding programs aiming to reduce the losses produced by CGMMV with resistant commercial melon cultivars.
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Project description:Cucumber green mottle mosaic virus (CGMMV), as a typical seed-borne virus, causes costly and devastating diseases in the vegetable trade worldwide. Genetic sources for resistance to CGMMV in cucurbits are limited, and environmentally safe approaches for curbing the accumulation and spread of seed-transmitted viruses and cultivating completely resistant plants are needed. Here, we describe the design and application of RNA interference-based technologies, containing artificial microRNA (amiRNA) and synthetic trans-acting small interfering RNA (syn-tasiRNA), against conserved regions of different strains of the CGMMV genome. We used a rapid transient sensor system to identify effective anti-CGMMV amiRNAs. A virus seed transmission assay was developed, showing that the externally added polycistronic amiRNA and syn-tasiRNA can successfully block the accumulation of CGMMV in cucumber, but different virulent strains exhibited distinct influences on the expression of amiRNA due to the activity of the RNA-silencing suppressor. We also established stable transgenic cucumber plants expressing polycistronic amiRNA, which conferred disease resistance against CGMMV, and no sequence mutation was observed in CGMMV. This study demonstrates that RNA interference-based technologies can effectively prevent the occurrence and accumulation of CGMMV. The results provide a basis to establish and fine-tune approaches to prevent and treat seed-based transmission viral infections.
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