Low gene copy number shows that arbuscular mycorrhizal fungi inherit genetically different nuclei

@article{Hijri2005LowGC,
  title={Low gene copy number shows that arbuscular mycorrhizal fungi inherit genetically different nuclei},
  author={Mohamed Hijri and Ian R. Sanders},
  journal={Nature},
  year={2005},
  volume={433},
  pages={160-163}
}
Arbuscular mycorrhizal fungi (AMF) are ancient asexually reproducing organisms that form symbioses with the majority of plant species, improving plant nutrition and promoting plant diversity. Little is known about the evolution or organization of the genomes of any eukaryotic symbiont or ancient asexual organism. Direct evidence shows that one AMF species is heterokaryotic; that is, containing populations of genetically different nuclei. It has been suggested, however, that the genetic… 
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Nonself vegetative fusion and genetic exchange in the arbuscular mycorrhizal fungus Glomus intraradices.
TLDR
The ability to perform genetic crosses between AMF experimentally lays a foundation for understanding the genetics and evolutionary biology of these important plants symbionts and indicates that considerable promiscuity could occur in these fungi.
Genomic Organization and Mechanisms of Inheritance in Arbuscular Mycorrhizal Fungi: Contrasting the Evidence and Implications of Current Theories
TLDR
Most plants, including the majority of crop species, associate with a specific group of soil fungi called arbuscular mycorrhizal fungi, which appear to be the oldest asexual multicellular eukaryotes and remain enigmatic.
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