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Plant viruses of the genus cause significant economic losses in various crops. The emergence of new tobamoviruses such as the tomato brown rugose fruit virus (ToBRFV) poses a major threat to global agriculture. Upon infection, plants mount a complex immune response to restrict virus replication and spread, involving a multilayered defense system that includes defense hormones, RNA silencing, and immune receptors. To counter these defenses, tobamoviruses have evolved various strategies to evade or suppress the different immune pathways. Understanding the interactions between tobamoviruses and the plant immune pathways is crucial for the development of effective control measures and genetic resistance to these viruses. In this review, we discuss past and current knowledge of the intricate relationship between tobamoviruses and host immunity. We use this knowledge to understand the emergence of ToBRFV and discuss potential approaches for the development of new resistance strategies to cope with emerging tobamoviruses.
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http://dx.doi.org/10.1146/annurev-virology-111821-122847 | DOI Listing |
Sci China Life Sci
September 2025
MOE Key Laboratory of Bioinformatics and Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
Tomato brown rugose fruit virus (ToBRFV) overcomes all known tomato resistance genes, including the durable Tm-2, posing a serious threat to global tomato production. Here, we employed in vitro random mutagenesis to evolve the Tm-2 leucine-rich repeat (LRR) domain and screened ∼8,000 variants for gain-of-function mutants capable of recognizing the ToBRFV movement protein (MP) and triggering hypersensitive cell death. We identified five such mutants.
View Article and Find Full Text PDFPestic Biochem Physiol
November 2025
Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China. Electronic address:
The extensive use of highly toxic and residual pesticides has a significant negative impact on agricultural production and the ecological environment. The development of new green antiviral agents has become a major demand for ensuring the development of green ecological agriculture. Indole alkaloids are widely present in nature and have diverse biological activities.
View Article and Find Full Text PDFBMC Plant Biol
August 2025
Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
Tobacco mosaic virus (TMV) severely impairs plant growth, leading to significant economic losses in the production of various Solanaceae crops, including tobacco (Nicotiana tabacum), tomato (Solanum lycopersicum) and pepper (Caspicum annuum). To investigate TMV resistance mechanisms, we analyzed the transcriptomic and metabolomic profiles of susceptible (K326) and resistant (R_K326) tobacco lines. Transcriptomic analysis revealed that the number of differentially expressed genes (DEGs) in R_K326 was about 2 times higher than in K326 at 9 days post-inoculation (dpi), suggesting a greater involvement of defense-related genes in the resistant line.
View Article and Find Full Text PDFJ Agric Food Chem
August 2025
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan Minzu University, Kunming 650500, P. R. China.
Fourteen compounds, including three new isochromenes (-) and four new isoquinolines (-), were isolated from YMZU50. The anti-tobacco mosaic virus (TMV) activities of compounds - and were evaluated. Compound exhibited the strongest inactivation and protective effects, with inhibition rates of 76.
View Article and Find Full Text PDFPestic Biochem Physiol
September 2025
School of Life Science, Nanchang University, Nanchang, Jiangxi, China. Electronic address:
Although biopesticides possess advantages such as target specificity and environmental friendliness, their inconsistent efficacy under field conditions significantly hinders large-scale adoption and application. fTDP, a protein obtained by prokaryotic fusion expression system, is capable of inducing systemic acquired resistance (SAR) in plants, thereby inhibiting tobacco mosaic virus (TMV) infection and demonstrating significant potential for development as an antiviral biopesticide. In this study, chitosan nanoparticles, loaded with fTDP (CSNPs-fTDP) were prepared by ionic gelation to address the instability of fTDP proteins in field applications.
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