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Daphne decline: what is the causal agent(s)?

J Fránová1, D-E Lesemann

  • 1Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Plant Molecular Biology, Department of Plant Virology, Ceské Budejovice, Czech Republic. jana@umbr.cas.cz

Acta Virologica
|January 17, 2008
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A double infection of Daphne mosaic virus (DapMV) and a bacilliform virus was found in diseased Daphne mezereum. This mixed virus infection is suspected to cause the decline of Daphne mezereum in the Czech Republic.

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Area of Science:

  • Plant Pathology
  • Virology
  • Botany

Background:

  • Daphne mezereum shrubs in the Czech Republic exhibit mosaic patterns, premature reddening, defoliation, and declining health.
  • These symptoms suggest a potential viral etiology impacting Daphne mezereum health.

Purpose of the Study:

  • To identify the viral agents responsible for the observed decline in Daphne mezereum.
  • To characterize the morphology and location of the associated viruses within infected plant tissues.

Main Methods:

  • Electron microscopy was used to examine ultrathin sections of infected root and leaf tissues.
  • Virus particle morphology and location within plant cells were analyzed.

Main Results:

  • A mixed infection of Daphne mosaic virus (DapMV) and an associated bacilliform virus was identified.
  • Extensive aggregations of bacilliform particles (166-370 x 65 nm and 169-233 x 68-78 nm) were observed in the nucleus or perinuclear space.
  • Occasional single bacilliform virions were found in the cytoplasm of leaf cells, suggesting potential classification within the genus Nucleorhabdovirus, family Rhabdoviridae.

Conclusions:

  • The mixed viral infection, involving DapMV and a bacilliform virus, is hypothesized to be the cause of Daphne mezereum decline in the Czech Republic.
  • Further research is warranted to confirm the pathogenicity and taxonomic classification of the identified bacilliform virus.