Quick Test for Detecting Tomato Mosaic Virus

Greg Howard
14th June, 2024

Quick Test for Detecting Tomato Mosaic Virus

Tomato mosaic virus infection manifests in the field with a range of visible disease symptoms, such as mottling and leaf deformation, on host plants like tomato (Solanum lycopersicum) (a) and black nightshade (Solanum nigrum) (b).

Image adapted from: Kirasi et al. / CC BY (Source)

Key Findings

  • Researchers at PAUSTI developed a rapid and highly sensitive RT-LAMP assay to detect Tomato mosaic virus (ToMV) in tomato samples
  • The RT-LAMP assay can detect ToMV within 4 minutes and 45 seconds, showing 1,000-fold higher sensitivity than the conventional RT-PCR method
  • The assay's high sensitivity and specificity make it a valuable tool for on-site detection, aiding in effective ToMV management and control
Tomato mosaic virus (ToMV) is a significant pathogen affecting various crops, with transmission facilitated through mechanical means and contaminated seeds or planting materials. This makes its management particularly challenging. To address this, researchers at the Pan African University Institute for Basic Sciences, Technology and Innovation (PAUSTI) conducted a study to develop a rapid and highly sensitive detection method for ToMV[1]. Between January and May 2023, a survey was conducted in major tomato-growing counties in Kenya, including Baringo, Kajiado, Kirinyaga, and Laikipia. The aim was to establish the incidence of ToMV and collect samples for optimizing a reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay. The RT-LAMP assay was designed using primers targeting the coat protein of ToMV, which is a critical component of the virus's structure. The RT-LAMP assay demonstrated the ability to detect ToMV in tomato samples within 4 minutes and 45 seconds. This method exhibited 1,000-fold higher sensitivity compared to the conventional reverse transcription polymerase chain reaction (RT-PCR) method. Furthermore, the assay was specific to ToMV, meaning it did not cross-react with other viruses. Practical applicability was confirmed by detecting the virus in 14 tomato leaf samples from the field, compared to only 11 samples detected by RT-PCR, highlighting the greater sensitivity of the RT-LAMP assay. A quick-extraction method using alkaline polyethylene glycol buffer was also evaluated, enabling direct detection of the virus from crude leaf extracts. This method further enhances the assay's utility for on-site detection, making it a valuable tool for field surveys and quarantine inspections, thereby contributing to robust management of ToMV infections. Previous studies have highlighted the importance of reliable and rapid virus detection methods. For instance, a study developed a multiplex RT-PCR technique to simultaneously detect Tobacco mosaic virus (TMV) and ToMV in pepper and tomato seeds, showcasing the need for cost-effective and accurate diagnostic techniques[2]. Another study emphasized the necessity for reliable diagnosis of tobamoviruses, including the tomato brown rugose fruit virus, due to their stability and seed-borne nature[3]. The development of a real-time RT-PCR detection system for these viruses demonstrated good analytical sensitivity and specificity, underscoring the importance of such advancements in plant pathology. The current study by PAUSTI builds upon these findings by offering a faster and more sensitive alternative to existing methods. The RT-LAMP assay's rapid detection capability and high sensitivity make it a significant improvement over traditional RT-PCR methods. This advancement is particularly crucial for managing ToMV, given its economic impact on crop production and the challenges associated with its transmission and detection. In conclusion, the RT-LAMP assay developed by PAUSTI researchers represents a significant step forward in the detection and management of ToMV. Its high sensitivity, specificity, and rapid detection time make it an invaluable tool for field surveys and quarantine inspections, ultimately aiding in the effective control of ToMV outbreaks. This study, alongside previous research efforts, underscores the continuous need for innovative diagnostic techniques to combat plant viruses and protect global agriculture.

AgricultureBiotechPlant Science

References

Main Study

1) A reverse transcription loop-mediated isothermal amplification assay for quick detection of tomato mosaic virus.

Published 13th June, 2024

https://doi.org/10.1371/journal.pone.0304497

Related Studies

2) Detection of Tobacco mosaic virus and Tomato mosaic virus in pepper and tomato by multiplex RT-PCR.

https://doi.org/10.1111/j.1472-765X.2011.03117.x

3) Development and Validation of a One-Step Reverse Transcription Real-Time PCR Assay for Simultaneous Detection and Identification of Tomato Mottle Mosaic Virus and Tomato Brown Rugose Fruit Virus.

https://doi.org/10.3390/plants11040489


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