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New method pinpoints virus that targets Ecuador fruit crop

August 19, 2024
in Technology and Engineering
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New method pinpoints virus that targets Ecuador fruit crop
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Scientists in Ecuador have developed a new method to detect and diagnose a virus that devastates crops of babaco, a fruit plant of economic importance to local farmers.

The team, at Universidad San Francisco de Quito in Ecuador, developed species- and genus-specific primers to detect the Babaco Mosaic Virus (BabMV) and its closest relatives by RT-PCR and RT-qPCR. 

The research is outlined in an article, ‘Development of novel species-specific and genus-specific primers for the detection of Babaco Mosaic Virus (BabMV)’, which appears in Letters in Applied Microbiology, an Applied Microbiology International publication.

The novel primers will contribute to an accurate detection of this virus and a better management of the babaco crop in Ecuador, says corresponding author Dr María de Lourdes Torres.

Hybrid cultivar

Babaco (Vasconcellea heilbornii var. Pentagona Badillo) is a sterile, hybrid cultivar of the Caricaceae family resulting from the interspecies cross between Carica pubescens (chamburo) and Carica stipulata (toronche). It is native to the subtropical regions of Ecuador and Colombia, she said. 

“Its fruit has a high nutritional content and delicate acid flavor and aroma, making it attractive for international commercialization. Babaco production is one of the main sources of income for hundreds of families in the Ecuadorian highlands,” Dr Torres said.

“Babaco plants are affected by several phytopathogens that cause significant crop losses. Viruses are of special concern since they not only reduce crop yield and damage fruits but also reduce the life span of the plants. This issue raises great concern among babaco growers.

“The threat posed by viruses, especially Babaco Mosaic Virus (BabMV), to babaco crop production makes it necessary to develop efficient detection and diagnosis techniques in order to promote this crop production and enhance the economy of local farmers in Ecuador.”

Novel species-specific primers

The team developed novel species-specific primers to detect BabMV targeting a 165 bp region of the coat protein (CP). Genus-specific primers were designed to validate the species-specific primers and attest their ability to discriminate between BabMV and its closest relatives. These primers targeted a 175 bp fragment of the CP region.

The most effective sets of primers were chosen for reverse transcription polymerase chain reaction (RT-PCR) and SYBR® Green-based quantitative reverse transcription polymerase chain reaction (RT-qPCR) in symptomatic and asymptomatic babaco plants. Among 28 plants tested, 25 were positive and 3 were negative for BabMV using species-specific and genus-specific primers in RT-PCR and RT-qPCR, while the PapMV positive control used was detected with the genus-specific primers and was negative for the species-specific primers. 

In this way, the scientists standardized a protocol that could be used to detect BabMV and its closest relatives in babaco crops and contribute to a more efficient production of this fruit in Ecuador.

Scale of virus threat

What proved surprising was the scale of the threat posed by the virus.

“Babaco Mosaic Virus (BabMV) appears to be a highly prevalent phytopathogen in babaco plants, even those grown under greenhouse conditions. Our study, which focused on nursery babaco plants, highlights the widespread nature and significant concern of this virus in Ecuador,” Dr Torres said. 

“The presence of BabMV impacts both food security and the economic sustainability of many local farmers in Ecuador.

“The results of our research shed light on a methodology that could also be developed for other plant pathogens that affect economically important crops throughout the region. Efficient detection and diagnosis methods are the first step in controlling diseases that reduce crop production and yield. 

“In this way, the primers developed in this study will help to identify affected crops in the country and start developing strategies to manage the diseases caused by BabMV and its closest relatives.”

Larger sample size

Future studies will require a more diverse sample size to strengthen and validate the robustness of the primers, Dr Torres said.

“Our study was limited to nursery babaco plants from three different localities in Ecuador, serving as a preliminary test of our primers on an accessible and affordable group of plants at the time. Subsequent studies should include a larger sample size from various locations to further validate our results. Additionally, future research should include plants growing in the field, not just in nurseries, to gain a broader understanding of our primers’ validity.”

The study was led by four Ecuadorian women scientists from Universidad San Francisco de Quito (USFQ) from the Plant Biotechnology Laboratory. It is worth mentioning that the first author of this publication is Martina Albuja, a young researcher who will soon begin her master’s studies in the United States. 

The study was supported by a research grant from the Colegio de Ciencias Biológicas y Ambientales of the USFQ. ‘Development of novel species-specific and genus-specific primers for the detection of Babaco Mosaic Virus (BabMV)’ appears in Letters in Applied Microbiology.

 

NOTES TO EDITORS

  1. Applied Microbiology International (AMI) is the oldest microbiology society in the UK and with more than half of its membership outside the UK, is truly global, serving microbiologists based in universities, private industry and research institutes around the world. AMI provides funding to encourage research and broad participation at its events and to ensure diverse voices are around the table working together to solve the sustainability development goals it has chosen to support. AMI publishes leading industry magazine, The Microbiologist, and in partnership with Oxford University Press, publishes three internationally acclaimed journals. It gives a voice to applied microbiologists around the world, amplifying their collective influence and informing international, evidence-based, decision making. 
  2. Oxford University Press (OUP) is a department of the University of Oxford. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide. OUP is the world’s largest university press with the widest global presence.
  3. OUP publishes more than 500 academic and research journals covering a broad range of subject areas, two-thirds of which are published in collaboration with learned societies and other international organizations. It has been publishing journals for more than a century and, as the world’s largest university press, has more than 500 years of publishing expertise.
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