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Local Adaptation to Soil Hypoxia Determines the Structure of an Arbuscular Mycorrhizal Fungal Community in Roots from Natural CO <sub>2</sub> Springs

Maček, Irena and Dumbrell, Alex J and Nelson, Michaela and Fitter, Alastair H and Vodnik, Dominik and Helgason, Thorunn (2011) 'Local Adaptation to Soil Hypoxia Determines the Structure of an Arbuscular Mycorrhizal Fungal Community in Roots from Natural CO <sub>2</sub> Springs.' Applied and Environmental Microbiology, 77 (14). pp. 4770-4777. ISSN 0099-2240

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Abstract

<jats:title>ABSTRACT</jats:title> <jats:p> The processes responsible for producing and maintaining the diversity of natural arbuscular mycorrhizal (AM) fungal communities remain largely unknown. We used natural CO <jats:sub>2</jats:sub> springs (mofettes), which create hypoxic soil environments, to determine whether a long-term, directional, abiotic selection pressure could change AM fungal community structure and drive the selection of particular AM fungal phylotypes. We explored whether those phylotypes that appear exclusively in hypoxic soils are local specialists or widespread generalists able to tolerate a range of soil conditions. AM fungal community composition was characterized by cloning, restriction fragment length polymorphism typing, and the sequencing of small subunit rRNA genes from roots of four plant species growing at high (hypoxic) and low (control) geological CO <jats:sub>2</jats:sub> exposure. We found significant levels of AM fungal community turnover (β diversity) between soil types and the numerical dominance of two AM fungal phylotypes in hypoxic soils. Our results strongly suggest that direct environmental selection acting on AM fungi is a major factor regulating AM fungal communities and their phylogeographic patterns. Consequently, some AM fungi are more strongly associated with local variations in the soil environment than with their host plant's distribution. </jats:p>

Item Type: Article
Uncontrolled Keywords: Mycorrhizae; Plants; Carbon Dioxide; RNA, Ribosomal; Soil; Soil Microbiology; Fresh Water; Adaptation, Physiological; Phylogeny; Anaerobiosis; Polymorphism, Restriction Fragment Length; Molecular Sequence Data; Microbial Consortia
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 27 Sep 2011 12:18
Last Modified: 18 Aug 2022 11:00
URI: http://repository.essex.ac.uk/id/eprint/809

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