Novel Emaravirus Discovered in Citrus Plants in South Africa

Strategic Insights -

Researchers at Stellenbosch University have discovered a new emaravirus, named citrus emaravirus 1 (CiEV1), in citrus leaves collected in the North West Province of South Africa. The discovery was made possible through the application of high-throughput sequencing (HTS) and phylogenetic analysis. The study found that CiEV1 is a member of the genus Emaravirus, family Fimoviridae, and is characterized by four conserved genomic segments encoding characteristic proteins.

Key Takeaways:

  • The novel emaravirus, CiEV1, was identified in citrus leaves collected in the North West Province of South Africa through high-throughput sequencing (HTS) and phylogenetic analysis.
  • CiEV1 is a member of the genus Emaravirus, family Fimoviridae, and is characterized by four conserved genomic segments encoding characteristic proteins.
  • The study found no association between CiEV1 and symptoms in citrus plants, expanding the known host range of the genus and contributing to the growing evidence of viral diversity in citrus.
  • The research concluded that further investigation is required to determine the epidemiological significance of CiEV1 in citrus orchards.
  • The study aims to better understand the virus's impact on citrus plants and potentially identify new viral diseases.
  • CiEV1 is the first report of an emaravirus detected in citrus, and its discovery highlights the importance of high-throughput sequencing in discovering novel viruses.

Statistics:

  • The study was conducted by researchers at Stellenbosch University and was funded by the university.
  • The HTS analysis identified contigs corresponding to the four conserved emaravirus genomic segments (RNA1-RNA4).
  • The phylogenetic analysis placed CiEV1 within clade D of the genus Emaravirus (family Fimoviridae).
  • To date, no association with symptoms has been identified in citrus plants infected with CiEV1.
  • The study found that CiEV1 is a novel virus with a unique genomic character, contributing to the growing evidence of viral diversity in citrus.

Sources:

  • "Molecular characterisation of a novel citrus-infecting emaravirus, citrus emaravirus 1." Archives of Virology, 2025;170(11):219.
  • "Studies from R. Bester and Co-Researchers Update Current Data on Life Science (Molecular characterisation of a novel citrus-infecting emaravirus, citrus emaravirus 1)." Life Science Weekly. October 21, 2025; p 7162.
  • The citation for this news report is: NewsRx.