Linked Life Data

19066622

Source:http://linkedlifedata.com/resource/pubmed/id/19066622

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2009-2-19
pubmed:abstractText
Genetic structuring in response to the glacial cycles has been investigated for many plant species, but exclusively high-arctic ones have not been studied. Such extremely cold-adapted species have probably experienced range reductions under the present climate. Here we compare three predominantly selfing species of Draba with different distributions and hardiness (D. subcapitata, high-arctic; D. nivalis, arctic to arctic-alpine; D. fladnizensis, arctic-alpine) for genetic structuring on the basis of two different types of molecular markers (10 microsatellite loci and 160 amplified fragment length polymorphisms (AFLPs)). The degree of genetic structuring within these species is of particular interest because it has been shown that they contain many cryptic biological species. The high-arctic D. subcapitata had less phylogeographic structure, less diversity and fewer private alleles than the other two species, suggesting that long-distance dispersal may occur more frequently in the high arctic, that hardy plants may have higher probability for establishment after dispersal under high-arctic conditions and that high-arctic species may have experienced a bottleneck during the present interglacial. In contrast, D. fladnizensis and D. nivalis showed distinct phylogeographic structure and more diversity, suggesting separate long-term refugia in Eurasia and North America/Beringia. The AFLP markers revealed more phylogeographic structuring than the microsatellites, possibly because of the higher number of loci surveyed and/or because structure at very large geographic scales is blurred by high mutation rate leading to homoplasy at microsatellite loci. The number of genetic groups detected was in any case insignificant compared with the numerous cryptic biological species known within these species, supporting rapid development of sterility barriers.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1365-2540
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
102
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
293-302
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Genetic structuring in three closely related circumpolar plant species: AFLP versus microsatellite markers and high-arctic versus arctic-alpine distributions.
pubmed:affiliation
National Centre for Biosystematics, Natural History Museum, University of Oslo, Blindern, Oslo, Norway. inger.skrede@nhm.uio.no
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't