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      Molecular studies reveal a speciation process within Ryvardenia cretacea (Polyporales, Basidiomycota) Translated title: Estudios moleculares revelan la existencia de un proceso de especiación en Ryvardenia cretacea (Polyporales, Basidiomycota)

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      Kurtziana

      Museo Botánico

      Filogenia, Políporos, Especiación, Phylogeny, Polypores, Speciation

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          Abstract

          rDNA sequentiation and phylogenetic analysis of the ITS region of strains of the brown-rot polypore Ryvardenia cretacea from Australia (Tasmania, Victoria) and Argentina (Patagonia) revealed the existence of two well supported clades. Each clade appears restricted to one side of the Pacific indicating a strong biogeographical isolation between strains and populations in the process of speciation. Nevertheless, detailed studies and comparisons did not show the existence of significant morphological differences. This fact, coupled with previously reported dikaryon x monosporic mating tests which showed biological compatibility between specimens from both regions, supports the maintenance of a complex but taxonomically single entity.

          Translated abstract

          La secuenciación molecular del segmento ITS del ADNr de cepas del políporo de pudrición castaña Ryvardenia cretacea provenientes de Australia (Tasmania, Victoria) y de Argentina (Patagonia) y su posterior análisis filogenético permitió revelar la existencia de dos clados con buen soporte. Cada una de ellos aparece con una distribución geográfica restringida a cada lado del Pacífico austral, indicando la existencia de un proceso de especiación. No obstante, estudios morfológicos comparativos detallados no revelaron la existencia de diferencias morfológicas entre materiales de herbario de esas procedencias. Ello, junto al hecho que investigaciones previas demostraron la compatibilidad entre cultivos secundarios y primarios entre especímenes de ambas regiones, sostiene el considerar a este taxón como un complejo con una única entidad taxonómica a nivel de especie.

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          Most cited references 18

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          Wind as a long-distance dispersal vehicle in the Southern Hemisphere.

          Anisotropic (direction-dependent) long-distance dispersal (LDD) by wind has been invoked to explain the strong floristic affinities shared among landmasses in the Southern Hemisphere. Its contribution has not yet been systematically tested because of the previous lack of global data on winds. We used global winds coverage from the National Aeronautics and Space Administration SeaWinds scatterometer to test whether floristic similarities of Southern Hemisphere moss, liverwort, lichen, and pteridophyte floras conform better with (i) the anisotropic LDD hypothesis, which predicts that connection by "wind highways" increases floristic similarities, or (ii) a direction-independent LDD hypothesis, which predicts that floristic similarities among sites increase with geographic proximity. We found a stronger correlation of floristic similarities with wind connectivity than with geographic proximities, which supports the idea that wind is a dispersal vehicle for many organisms in the Southern Hemisphere.
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            A phylogenetic study of the genus Schizopora (Basidiomycota) based on ITS DNA sequences

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              Polyporaceae of New Zealand

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                Author and article information

                Journal
                kurtz
                Kurtziana
                Kurtziana
                Museo Botánico (Córdoba, Córdoba, Argentina )
                1852-5962
                June 2012
                : 37
                : 1
                : 7-13
                Affiliations
                Esquel Chubut orgnameCentro de Investigación y Extensión Forestal Andino Patagónico orgdiv1Protección Forestal Argentina
                orgnameConsejo Nacional de Investigaciones Científicas y Técnicas Argentina
                Article
                S1852-59622012000100002 S1852-5962(12)03700100002

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 18, Pages: 7
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