Extensive Clonal Assemblies in Populus alba and Populus x canescens from the Iberian Peninsula
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ORIGINAL PAPER
Extensive Clonal Assemblies in Populus alba and Populus x canescens from the Iberian Peninsula Luis Santos-del-Blanco & Ana I. de-Lucas & Santiago C. González-Martínez & Rosario Sierra-de-Grado & Elena Hidalgo
Received: 2 March 2012 / Revised: 18 September 2012 / Accepted: 4 October 2012 / Published online: 6 November 2012 # Springer-Verlag Berlin Heidelberg 2012
Abstract Riparian vegetation in temperate zones holds great environmental importance and thus its conservation should be a priority. Among riverine tree species, genus Populus stands out, being also a model organism in research. In this work, we present a genetic analysis of the hybrid Populus x canescens and its parent species Populus alba and Populus tremula, with special emphasis in P. alba with which backcrosses frequently occur. This study focuses on the river Douro basin (Spain) where the presence of hybrids has been previously reported. Nuclear microsatellite markers and Bayesian statistical analysis have been used for the detection of hybrids and purebred
stands. This methodology has also made possible the study of clonality in the taxonomic continuum P. alba–P. x canescens. Our results highlight the existence of a small number of genotypes accounting for most of the individual trees and stands. Possible causes leading to this situation are discussed. Also, the presence of individuals genetically close to ornamental cultivars is reported for the first time. Finally, concern about the present situation of P. alba genetic resources is brought up. Keywords Riparian vegetation . Clonality . Hybridization . Nuclear microsatellites . Introgression . Conservation genetics
Communicated by A. Brunner Electronic supplementary material The online version of this article (doi:10.1007/s11295-012-0574-8) contains supplementary material, which is available to authorized users. L. Santos-del-Blanco (*) : S. C. González-Martínez Department of Forest Ecology and Genetics, INIA-CIFOR, Carretera A Coruña km 7.5, 28040 Madrid, Spain e-mail: [email protected] L. Santos-del-Blanco : A. I. de-Lucas : S. C. González-Martínez : R. Sierra-de-Grado : E. Hidalgo Sustainable Forest Management Research Institute, University of Valladolid / INIA-CIFOR URL: http://sostenible.palencia.uva.es R. Sierra-de-Grado : E. Hidalgo Departamento de Producción Vegetal y Recursos Forestales, E.T.S. Ingenierías Agrarias, Universidad de Valladolid, Avenida de Madrid 44, 34071 Palencia, Spain A. I. de-Lucas ITAGRA.CT (Centro Tecnológico Agrario y Agroalimentario), Campus Universitario “La Yutera”, Edif. A. Avda. de Madrid, 44, 34071 Palencia, Spain
Introduction Riparian vegetation provides a corridor for movement of biota, and it is related to important ecological processes (Richardson et al. 2007). Willows and poplars (Salicaceae) are main components of temperate riverine forests and thus are important species for conservation and restoration of native riparian ecosystems, particularly in Europe, where only 1 % of them remain unchanged (Smulders et al. 2008). Information rega
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