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Spatial heterogeneity in genetic diversity and composition of bacterial symbionts in a single host species population

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Title: Spatial heterogeneity in genetic diversity and composition of bacterial symbionts in a single host species population
Authors: Kagiya, Shinnosuke Browse this author
Utsumi, Shunsuke Browse this author →KAKEN DB
Keywords: Alnus hirsuta
Genetic diversity
Local scale
nifD-K IGS region
Nitrogen-fixing bacteria
Root nodule symbiosis
Issue Date: 15-Jun-2020
Publisher: Springer
Journal Title: Plant and soil
Volume: 452
Start Page: 513
End Page: 527
Publisher DOI: 10.1007/s11104-020-04583-4
Abstract: Aims Revealing genetic diversity in a root nodulation symbiosis under field conditions is critical to understand the formation of ecological communities of organisms associated with hosts and the nitrogen cycle in natural ecosystems. However, our knowledge of the genetic diversity of bacterial mutualists on a local scale is still poor because of the assumption that the genetic diversity of mutualistic bacteria is constrained by their hosts. Methods We thoroughly investigated the genetic diversity ofFrankiain a local forest stand. We collected root nodules from 213Alnus hirsutaseedlings covering the spatial range of the continuous population, which means thatAlnusindividuals occurred in a relatively homogeneous distribution in a continuous forest. Then, a phylogenetic and diversity analysis was performed for thenifD-K IGS region, including globalFrankiasequences fromAlnushosts. Results The genetic diversity ofFrankiadetected even on a local scale measured as high as that shown by previous studies conducted on local and regional scales. Moreover, a genetic structure analysis revealed a spatially mosaic-like distribution of genetic variation inFrankiadespite the small spatial scale. Conclusions The genetic diversity and composition of bacterial mutualists are heterogeneous on a local scale. Our findings demonstrate that genetically different bacterial symbionts simultaneously interact with a single host population and interaction partnerships spatially vary. The standing variation could produce dynamic ecological and evolutionary outcomes in a heterogeneous forest ecosystem.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Plant and soil. The final authenticated version is available online at:
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 内海 俊介

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