Evolutionary genomics of arbuscular mycorrhizal fungi

Riley, Rohan; Charron, Philippe; Marton, Timea; Corradi, Nicolas

doi:10.1002/9781118951446.ch23

Cited by 2 publications

(2 citation statements)

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“…In some cases, duplicated genes form tandemly repeated arrays ( Fig. S2; Riley et al, 2016). Accessory genes are found in all predicted functional categories and include many PFAM domains ( Fig.…”

Section: High Intraspecific Functional Diversity In a Model Amfmentioning

confidence: 99%

High intraspecific genome diversity in the model arbuscular mycorrhizal symbiont Rhizophagus irregularis

et al. 2018

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Arbuscular mycorrhizal fungi (AMF) are known to improve plant fitness through the establishment of mycorrhizal symbioses. Genetic and phenotypic variations among closely related AMF isolates can significantly affect plant growth, but the genomic changes underlying this variability are unclear. To address this issue, we improved the genome assembly and gene annotation of the model strain Rhizophagus irregularis DAOM197198, and compared its gene content with five isolates of R. irregularis sampled in the same field. All isolates harbor striking genome variations, with large numbers of isolate-specific genes, gene family expansions, and evidence of interisolate genetic exchange. The observed variability affects all gene ontology terms and PFAM protein domains, as well as putative mycorrhiza-induced small secreted effector-like proteins and other symbiosis differentially expressed genes. High variability is also found in active transposable elements. Overall, these findings indicate a substantial divergence in the functioning capacity of isolates harvested from the same field, and thus their genetic potential for adaptation to biotic and abiotic changes. Our data also provide a first glimpse into the genome diversity that resides within natural populations of these symbionts, and open avenues for future analyses of plant-AMF interactions that link AMF genome variation with plant phenotype and fitness.

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Section: High Intraspecific Functional Diversity In a Model Amfmentioning

confidence: 99%

High intraspecific genome diversity in the model arbuscular mycorrhizal symbiont Rhizophagus irregularis

et al. 2018

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“…The exact number of genetically differentiated nuclei is not clear, since genetic variation has never been exhaustively sampled for any locus in these fungi. No sexual stage has been observed, although possible recombination has been reported in AMF (see Riley et al 2016 and references therein). 2 It is possible that a single nucleus is not a viable entity in AMF -only populations of nuclei are (see Boon et al 2015;Wyss et al 2016 and references therein).…”

Section: Mosaic Individualsmentioning

confidence: 99%

Considering Intra-individual Genetic Heterogeneity to Understand Biodiversity

Boon

2019

History, Philosophy and Theory of the Life Sciences

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In this chapter, I am concerned with the concept of Intra-individual Genetic Hetereogeneity (IGH) and its potential influence on biodiversity estimates. Definitions of biological individuality are often indirectly dependent on genetic sampling-and vice versa. Genetic sampling typically focuses on a particular locus or set of loci, found in the the mitochondrial, chloroplast or nuclear genome. If ecological function or evolutionary individuality can be defined on the level of multiple divergent genomes, as I shall argue is the case in IGH, our current genetic sampling strategies and analytic approaches may miss out on relevant biodiversity. Now that more and more examples of IGH are available, it is becoming possible to investigate the positive and negative effects of IGH on the functioning and evolution of multicellular individuals more systematically. I consider some examples and argue that studying diversity through the lens of IGH facilitates thinking not in terms of units, but in terms of interactions between biological entities. This, in turn, enables a fresh take on the ecological and evolutionary significance of biological diversity.

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Evolutionary genomics of arbuscular mycorrhizal fungi

Cited by 2 publications

References 57 publications

High intraspecific genome diversity in the model arbuscular mycorrhizal symbiont Rhizophagus irregularis

High intraspecific genome diversity in the model arbuscular mycorrhizal symbiont Rhizophagus irregularis

Considering Intra-individual Genetic Heterogeneity to Understand Biodiversity

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