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Genome diversity in arbuscular mycorrhizal fungi

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JournalCURRENT OPINION IN PLANT BIOLOGY
DateE-pub ahead of print - 17 Jul 2015
DatePublished (current) - Aug 2015
Volume26
Number of pages7
Pages (from-to)113-119
Early online date17/07/15
Original languageEnglish

Abstract

Arbuscular mycorrhizal fungi (Glomeromycota) are the most widespread and important symbionts of plants. They cannot be cultured without plants, are apparently asexual, and have multiple nuclei in a common cytoplasm. There is evidence for genetic variation among nuclei, and for segregation of this variation during growth, but these findings remain contentious. Recently, two papers have reported whole genome sequences for a strain of Rhizophagus irregularis; both suggest that genetic variation among nuclei is low. Genome assembly is very incomplete, though, so significant nuclear diversity cannot be excluded. While the diversity of nuclear genomes remains unresolved, multiple complete mitochondrial genomes are now available; there is virtually no variation within isolates, but significant variation between them.

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