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ISSRs indicate isolation by distance and spatial structuring in Salix alba populations along alpine upstream rivers (Alto Adige and Upper Rhine)

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Abstract:

ISSR markers were used to assess the spatial genetic structure and isolation by distance in Salix alba populations along an altitude gradient in two contrasting rivers on a southern and a northern slope in the Alps. Five populations along the Alto Adige-Adige and four populations along the Upper Rhine-Rhine were investigated for ISSR polymorphism. A PCoA showed that most individual trees of the river Adige and of the river Rhine group together as a single species. The number of polymorphic loci, the proportion of polymorphic loci and Nei's gene diversity were higher for the Adige than for the Rhine. FST/(1 − FST) ratios between populations increased significantly with geographic distance for the Adige. This increase was also present for the Rhine but it was not significant. The relationship between pairwise FST/(1 – FST) and interpopulation altitude differences was not significant for both rivers. The within-population spatial genetic structure of both rivers showed positive values of the pairwise relationship coefficient in the first distance classes (0 - 25 m), which is an indication of isolation by distance within populations of both river transects. The Sp-statistic revealed a rather strong spatial genetic structure in both river basins. A pattern of genetic structure that corresponds to the model of isolation by distance was thus found at both intra and interpopulation levels. ISSR markers proved to be useful in estimating isolation by distance and spatial genetic structuring at both population and individual level for S. alba populations.

Keywords: DIOECIOUS TREE; DOMINANT MARKERS; SALICACEAE; SALIX ALBA; SPATIAL GENETIC STRUCTURE; WILLOW

Document Type: Research Article

Publication date: June 1, 2007

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  • The Belgian Journal of Botany (now known as Plant Ecology and Evolution) is an international journal open to all fields of plant sciences. Please note, however, that papers restricted to purely nomenclatural matters or to floristical data of only local interest will not be accepted. The Journal appears in one volume of two issues per year. It publishes reviews, original research papers, short notes, letters to the editor, and book reviews. Click here for current issues of this journal
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