A population genetic study in a scattered forest species, wild service tree [Sorbus torminalis (L.) Crantz], using RAPD markers |
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Authors: | P Belletti I Monteleone D Ferrazzini |
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Institution: | (1) DIVAPRA Plant Genetics and Breeding, University of Turin, via Leonardo da Vinci 44, 10095 Grugliasco, Italy |
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Abstract: | Wild service tree Sorbus torminalis (L.) Crantz] is a forest tree widespread in Europe, characterized by a scattered distribution. Its hermaphroditic flowers
are pollinated by insects, and outcrossing is the prominent mating system, also due to the presence of gametophytic self-incompatibility.
Genetic diversity and differentiation of 22 populations from northwestern Italy were investigated by means of variation scored
at 53 polymorphic RAPD (Random Amplified Polymorphic DNA) loci. Populations differed in genetic variation, with Shannon diversity
index ranging from 0.166 to 0.469. According to Analysis of Molecular Variance (AMOVA), most of the genetic variation was
found within populations (61.78%) with a significant proportion of variance attributable to genetic differences between regions
(23.60%) and between populations (14.62%). Evidence for isolation by distance was found in the set of populations sampled.
The effect of habitat fragmentation on genetic variation was also evaluated. The efficacy of RAPD markers in analysing genetic
variation, and the contribution of the results in terms of the preservation of biodiversity are discussed. |
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Keywords: | Gene flow Genetic differentiation Genetic variability Isolation by distance Nuclear DNA markers Scattered species Sorbus torminalis Wild service tree |
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