Mauricio Renny1, M Cristina Acosta1, Noelia Cofré1, Laura S Domínguez1, Martin I Bidartondo2,3, Alicia N Sérsic1. 1. Instituto Multidisciplinario de Biología Vegetal, IMBIV, UNC-CONICET, Edificio de Investigaciones Biológicas y Tecnológicas, Vélez Sársfield 1611, 5000 Córdoba, Argentina. 2. Department of Life Sciences, Imperial College London, London SW7 2AZ, UK. 3. Jodrell Laboratory, Royal Botanic Gardens, Kew TW9 3DS, UK.
Abstract
Background and Aims: Arachnitis uniflora is a mycoheterotrophic plant that exploits arbuscular mycorrhizal fungi of neighbouring plants. We tested A. uniflora 's specificity towards fungi across its large latitudinal range, as well as the role of historical events and current environmental, geographical and altitudinal variables on fungal genetic diversity. Methods: Arachnitis uniflora mycorrhizas were sampled at 25 sites. Fungal phylogenetic relationships were reconstructed, genetic diversity was calculated and the main divergent lineages were dated. Phylogeographical analysis was performed with the main fungal clade. Fungal diversity correlations with environmental factors were investigated. Key Results: Glomeraceae fungi dominated, with a main clade that likely originated in the Upper Cretaceous and diversified in the Miocene. Two other arbuscular mycorrhizal fungal families not previously known to be targeted by A. uniflora were detected rarely and appear to be facultative associations. High genetic diversity, found in Bolivia and both northern and southern Patagonia, was correlated with temperature, rainfall and soil features. Conclusions: Fungal genetic diversity and its distribution can be explained by the ancient evolutionary history of the target fungi and by micro-scale environmental conditions with a geographical mosaic pattern.
Background and Aims: Arachnitis uniflora is a mycoheterotrophic plant that exploits arbuscular mycorrhizal fungi of neighbouring plants. We tested A. uniflora 's specificity towards fungi across its large latitudinal range, as well as the role of historical events and current environmental, geographical and altitudinal variables on fungal genetic diversity. Methods:Arachnitis uniflora mycorrhizas were sampled at 25 sites. Fungal phylogenetic relationships were reconstructed, genetic diversity was calculated and the main divergent lineages were dated. Phylogeographical analysis was performed with the main fungal clade. Fungal diversity correlations with environmental factors were investigated. Key Results: Glomeraceae fungi dominated, with a main clade that likely originated in the Upper Cretaceous and diversified in the Miocene. Two other arbuscular mycorrhizal fungal families not previously known to be targeted by A. uniflora were detected rarely and appear to be facultative associations. High genetic diversity, found in Bolivia and both northern and southern Patagonia, was correlated with temperature, rainfall and soil features. Conclusions: Fungal genetic diversity and its distribution can be explained by the ancient evolutionary history of the target fungi and by micro-scale environmental conditions with a geographical mosaic pattern.
Authors: Martin I Bidartondo; Dirk Redecker; Isabelle Hijri; Andres Wiemken; Thomas D Bruns; Laura Domínguez; Alicia Sérsic; Jonathan R Leake; David J Read Journal: Nature Date: 2002-09-26 Impact factor: 49.962
Authors: Vincent S F T Merckx; Steven B Janssens; Nicole A Hynson; Chelsea D Specht; Thomas D Bruns; Erik F Smets Journal: Mol Ecol Date: 2012-02-07 Impact factor: 6.185
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