e-journal

High genetic diversity with moderate differentiation in Juniperus excelsa from Lebanon and the eastern Mediterranean region

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Abstract.
Background and aims:
Juniperus excelsa is an important woody species in the high mountain ecosystems of the
eastern Mediterranean Basin where it constitutes the only coniferous species found at the
tree line. The genetic diversity within and among J. excelsa populations of the eastern
Mediterranean Basin is studied in the light of their historical fragmentation.

Methodology:
Nuclear microsatellites originally developed for Juniperus communis and J. przewalskii were
tested on 320 individuals from 12 different populations originating from Lebanon, Turkey,
Cyprus, Greece and the Ukraine.

Principal results:
Among the 31 nuclear microsatellite primers tested, only three produced specific amplification
products, with orthology confirmed by sequence analysis. They were then used for
genetic diversity studies. The mean number of alleles and the expected heterozygosity
means were Na = 8.78 and He = 0.76, respectively. The fixation index showed a significant
deviation from Hardy–Weinberg equilibrium and an excess of homozygotes (FIS = 0.27–
0.56). A moderate level of genetic differentiation was observed among the populations
(FST = 0.075< P < 0.001). The most differentiated populations corresponded to old vestigial
stands found at the tree line (>2000 m) in Lebanon. These populations were differentiated
from the other populations that are grouped into three sub-clusters.

Conclusions:
High levels of genetic diversity were observed at species and population levels. The high level
of differentiation in the high-mountain Lebanese populations reflects a long period of isolation
or possibly a different origin. The admixture observed in other populations from
Lebanon suggests a more recent separation from the Turkish–southeastern European
populations.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press., 2011

Deskripsi Fisik

AoB PLANTS 2011 plr003 doi:10.1093/aobpla/plr003

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2011 plr003

Subjek

PEMULIAAN TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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