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AOBPreview originally published online on January 22, 2007
Annals of Botany 2007 99(4):647-651; doi:10.1093/aob/mcl290
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Spatial Genetic Structure and Clonal Diversity in an Alpine Population of Salix herbacea (Salicaceae)

Christoph Reisch*, Sophia Schurm and Peter Poschlod

University of Regensburg, Institute of Botany, D-93040 Regensburg, Germany

* For correspondence. E-mail christoph.reisch{at}biologie.uni-regensburg.de

Received: 28 September 2006    Returned for revision: 31 October 2006    Accepted: 6 December 2006    Published electronically: 22 January 2007

Background and Aims: Many alpine plant species combine clonal and sexual reproduction to minimize the risks of flowering and seed production in high mountain regions. The spatial genetic structure and diversity of these alpine species is strongly affected by different clonal strategies (phalanx or guerrilla) and the proportion of generative and vegetative reproduction.

Methods: The clonal structure of the alpine plant species Salix herbacea was investigated in a 3 x 3 m plot of an alpine meadow using microsatellite (simple sequence repeat; SSR) analysis. The data obtained were compared with the results of a random amplified polymorphic DNA (RAPD) analysis.

Key Results: SSR analysis, based on three loci and 16 alleles, revealed 24 different genotypes and a proportion of distinguishable genotypes of 0·18. Six SSR clones were found consisting of at least five samples, 17 clones consisting of more than two samples and seven single genotypes. Mean clone size comprising at least five samples was 0·96 m2, and spatial autocorrelation analysis showed strong similarity of samples up to 130 cm. RAPD analysis revealed a higher level of clonal diversity but a comparable number of larger clones and a similar spatial structure.

Conclusions: The spatial genetic structure as well as the occurrence of single genotypes revealed in this study suggests both clonal and sexual propagation and repeated seedling recruitment in established populations of S. herbacea and is thus suggestive of a relaxed phalanx strategy.

Key words: Salix herbacea, genotypic diversity, RAPD, SSR, molecular marker, clonality, spatial genetic structure


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