Investigating the effects of topography and clonality on genetic structuring within a large Norwegian population of Arabidopsis lyrata.

Abstract:

BACKGROUND AND AIMS:The gene flow through pollen or seeds governs the extent of spatial genetic structure in plant populations. Another factor that can contribute to this pattern is clonal growth. The perennial species Arabidopsis lyrata ssp. petraea (Brassicaceae) is a self-incompatible, clonal species found in disjunctive populations in central and northern Europe. METHODS:Fourteen microsatellite markers were employed to study the level of kinship and clonality in a high-altitude mountain valley at Spiterstulen, Norway. The population has a continuous distribution along the banks of the River Visa for about 1.5 km. A total of 17 (10 m x 10 m) squares were laid out in a north-south transect following the river on both sides. KEY RESULTS:It is shown that clonal growth is far more common than previously shown in this species, although the overall size of the genets is small (mean diameter = 6.4 cm). Across the whole population there is no indication of isolation by distance, and spatial genetic structure is only visible on fine spatial scales. In addition, no effect of the river on the spatial distribution of genotypes was found. CONCLUSIONS:Unexpectedly, the data show that populations of small perennials like A. lyrata can behave like panmictic units across relatively large areas at local sites, as opposed to earlier findings in central Europe.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Lundemo S,Stenøien HK,Savolainen O

doi

10.1093/aob/mcq102

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

243-54

issue

2

eissn

0305-7364

issn

1095-8290

pii

mcq102

journal_volume

106

pub_type

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