Horizontal genome transfer as an asexual path to the formation of new species - PubMed (original) (raw)

. 2014 Jul 10;511(7508):232-5.

doi: 10.1038/nature13291. Epub 2014 Jun 8.

Affiliations

• PMID: 24909992
• DOI: 10.1038/nature13291

Horizontal genome transfer as an asexual path to the formation of new species

Ignacia Fuentes et al. Nature. 2014.

Abstract

Allopolyploidization, the combination of the genomes from two different species, has been a major source of evolutionary innovation and a driver of speciation and environmental adaptation. In plants, it has also contributed greatly to crop domestication, as the superior properties of many modern crop plants were conferred by ancient allopolyploidization events. It is generally thought that allopolyploidization occurred through hybridization events between species, accompanied or followed by genome duplication. Although many allopolyploids arose from closely related species (congeners), there are also allopolyploid species that were formed from more distantly related progenitor species belonging to different genera or even different tribes. Here we have examined the possibility that allopolyploidization can also occur by asexual mechanisms. We show that upon grafting--a mechanism of plant-plant interaction that is widespread in nature--entire nuclear genomes can be transferred between plant cells. We provide direct evidence for this process resulting in speciation by creating a new allopolyploid plant species from a herbaceous species and a woody species in the nightshade family. The new species is fertile and produces fertile progeny. Our data highlight natural grafting as a potential asexual mechanism of speciation and also provide a method for the generation of novel allopolyploid crop species.

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Comment in

• Plant genetics: joining forces - asexual genome merger creates new allopolyploid species.
  Jones B. Jones B. Nat Rev Genet. 2014 Aug;15(8):515. doi: 10.1038/nrg3782. Epub 2014 Jun 24. Nat Rev Genet. 2014. PMID: 24958439 No abstract available.

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