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Related Experiment Videos

Geminivirus disease complexes: an emerging threat.

Shahid Mansoor1, Rob W Briddon, Yusuf Zafar

  • 1Plant Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), PO Box 577, Jhang Road, Faisalabad, Pakistan.

Trends in Plant Science
|March 29, 2003
PubMed
Summary

Small circular DNA satellites, named DNA beta, are required for whitefly-transmitted begomovirus accumulation and symptom development in plants. These diverse DNA satellites pose a significant threat to global agriculture.

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Area of Science:

  • Plant virology
  • Molecular biology
  • Agricultural science

Background:

  • Whitefly-transmitted monopartite begomoviruses are significant plant pathogens.
  • Small circular single-stranded DNA satellites, termed DNA beta, have been identified in plants infected with these viruses.
  • DNA beta satellites rely on helper begomoviruses for replication but are essential for virus accumulation and disease symptoms.

Purpose of the Study:

  • To describe the characteristics and implications of DNA beta satellites associated with begomoviruses.
  • To highlight the role of DNA beta in disease complex development and symptom expression.
  • To assess the potential threat posed by these begomovirus-satellite complexes to agriculture.

Main Methods:

  • Isolation and characterization of small circular single-stranded DNA satellites (DNA beta) from infected plants.

Related Experiment Videos

  • Analysis of the structure, coding regions, and regulatory elements of DNA beta satellites.
  • Epidemiological assessment of begomovirus-satellite disease complexes in Africa and Asia.

    • Main Results:

    • DNA beta satellites are highly diverse but share conserved structural features.
    • These satellites are indispensable for the accumulation of helper begomoviruses and the manifestation of disease symptoms.
    • Begomovirus-DNA beta complexes are prevalent in economically important crops, ornamentals, and weeds across Africa and Asia.

    Conclusions:

    • DNA beta satellites are critical components of begomovirus disease complexes, influencing virus proliferation and pathogenicity.
    • The widespread distribution and genetic diversity of these complexes represent a substantial risk to tropical and subtropical agriculture.
    • Global plant trade and whitefly vector dissemination facilitate the spread of these economically damaging plant diseases.