Endogenous pararetroviruses of allotetraploid Nicotiana tabacum and its diploid progenitors, N. sylvestris and N. tomentosiformis

Marjori Matzke*, Wolfgang Gregor, Michael Mette, Werner Aufsatz, Tatsuo Kanno, Johannes Jakowitsch, Antonius J.M. Matzke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Endogenous pararetroviruses (EPRVs) represent a new class of dispersed repetitive DNA in plants. The genomes of many Nicotiana species and other solanaceous plants are rich in EPRVs. Distinct EPRV families are present in N. sylvestris (Ns) and in N. tomentosiformis (Nto), the two diploid progenitors of allotetraploid N. tabacum. Nicotiana EPRVs represent an interesting type of repetitive sequence to analyse in polyploids because of their potential impact on plant fitness and the epigenetic architecture of plant genomes. The NsEPRV family appears identical in N. sylvestris and N. tabacum, indicating little change has occurred in either species since polyploid formation. By contrast, the NtoEPRV family is larger in N. tomentosiformis than in N. tabacum, suggesting either preferential elimination from the polyploid genome or specific accumulation in the diploid genome following polyploidization. The lability of NtoEPRVs might be enhanced by a frequent association with gypsy retrotransposons. Although some EPRVs are probably benign, others are potentially pathogenic or, conversely, determinants of virus resistance. Normally quiescent EPRVs can be reactivated and cause symptoms of infection in hybrids of species that differ in their EPRV content. EPRVs that furnish immunity to the free virus exemplify the selective value of so-called 'junk' DNA. Variation in the abundance and distribution of EPRVs among related species can be useful in taxonomic and evolutionary studies.

Original languageEnglish (US)
Pages (from-to)627-638
Number of pages12
JournalBiological Journal of the Linnean Society
Volume82
Issue number4
DOIs
StatePublished - Aug 1 2004

Keywords

  • Banana streak virus
  • DNA methylation
  • Epigenetics
  • Genome evolution
  • Hybrid
  • Rice tungro bacilliform virus
  • Solanaceae
  • Tobacco vein clearing virus
  • Virus resistance
  • gypsy retrotransposons

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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