Five statistical tests predicted multiple recombinant regions in the genome of a core set of isolates. Phylogenetic relationships among genotypes showed a reticulate network pattern providing a rationale to test for recombination. We addressed the question of recombination in the AMF Glomus intraradices by sequencing 11 polymorphic nuclear loci in 40 morphologically identical isolates from one field. Evidence for recombination in AMF is contradictory. Morphological stasis over 400 million years and the lack of an observed sexual stage in any member of the phylum Glomeromycota led to the controversial suggestion of AMF being ancients asexuals. This symbiosis is thought to have contributed to the early colonisation of land by plants. Arbuscular mycorrhizal fungi (AMF) are important symbionts of most plant species, promoting plant diversity and productivity.
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