e-journal

Ecological and historical determinants of population genetic structure and diversity in the Mediterranean shrub Rosmarinus officinalis (Lamiaceae)

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Population genetic studies of widespread Mediterranean shrubs are scarce compared with those of trees and narrow
endemics or studies from phylogeographical perspectives, despite the key role these species may play in Mediterranean
ecosystems. Knowledge on the effect of ecological factors in shaping their genetic patterns is also limited. In
this study we investigate genetic diversity and population structure across 18 populations of Rosmarinus officinalis,
a Mediterranean shrubland plant. Populations were sampled along two elevational gradients, one each on calcareous
and siliceous soils in a mountain system in the eastern Iberian Peninsula, to decipher the effect of ecological factors
on the genetic diversity and structure based on 11 microsatellite loci.We found overall high levels of genetic diversity and weak population structure. Genetic diversity increased with elevation, whereas population differentiation was stronger among populations growing on siliceous soils. The nested analysis of elevational gradients within soil types revealed that these general patterns were mostly driven by siliceous populations, whereas calcareous populations
were more homogeneous along elevational belts. Bayesian analysis of population structure revealed genetic membership of lowland and high-elevation populations to different genetic clusters and a higher admixture of intermediate-elevation populations to both clusters. High-elevation populations were less differentiated from a hypothetical ancestral cluster, suggesting the persistence of their gene pool during the Pleistocene glaciations. In contrast, lowland populations resulted from more recent divergence. We propose that life-history and reproductive traits mostly contribute to explain the high levels of genetic diversity and weak population structure, whereas ecological and historical factors mostly contribute to the stronger differentiation of siliceous populations and a rapid expansion of R. officinalis on calcareous soils possibly mediated by human landscape transformations

ADDITIONAL KEYWORDS: ecological gradients – elevational gradients – gene flow – microsatellite – rosemary – soil type

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Ketersediaan

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Informasi Detail

Judul Seri

Botanical Journal of the Linnean Societ

No. Panggil

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Penerbit

: The Linnean Society of London., 2016

Deskripsi Fisik

Botanical Journal of the Linnean Society, 2016, 180, 50–63.

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

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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