The influence of a relict distribution on genetic structure and variation in the Mediterranean tree, Platanus orientalis

AoB Plants
Rosita RinaldiS Fineschi

Abstract

The distribution of plant species around the Mediterranean basin is a product of the influence of both geographical barriers and of climatic changes experienced during the Tertiary, with the transition from a warm to cool periods. Several species, once largely distributed across the Northern Hemisphere, retracted to refugial areas in southern Europe where they are described as Tertiary relicts. Platanus orientalis is a typical representative of Tertiary flora in southwest Eurasia; its distribution spreads from the Caucasus to the Mediterranean, with its western border in Southern Italy and Sicily. We analysed genetic diversity and differentiation in the centre and western part of its distribution range using nuclear microsatellites and compared genetic parameters between core and western populations. We found an overall decrease in genetic diversity estimates (heterozygosity, private allelic richness) from central towards western populations, with those from Southern Italy and Sicily showing the lowest values. The low level of genetic diversity probably results from historic range fragmentation experienced by P. orientalis in its westernmost distribution as confirmed by high level genetic isolation of these populations. Ornamen...Continue Reading

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Datasets Mentioned

BETA
HM196359

Methods Mentioned

BETA
PCR
gene exchange

Software Mentioned

Genodive
ML
Migrate
msa
STRUCTURE
- n
NullFreq
STRUCTURE HARVESTER
Populations
GENEMAPPER

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