DU, Fang; PENG, Xiao Li; LIU, Jian Quan; LASCOUX, Martin; HU, Feng Sheng; PETIT, Remy

doi:10.1111/j.1469-8137.2011.03853.x

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DU, Fang
Biodiversité, Gènes & Communautés [BioGeCo]
Lanzhou University

PENG, Xiao Li
Lanzhou University

LIU, Jian Quan
Lanzhou University

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Article de revue

Ce document a été publié dans

New Phytologist. 2011, vol. 192, n° 4, p. 1024-1033

Wiley

Résumé en anglais

• A recent model has shown that, during range expansion of one species in a territory already occupied by a related species, introgression should take place preferentially from the resident species towards the invading species and genome components experiencing low rates of gene flow should introgress more readily than those experiencing high rates of gene flow. • Here, we use molecular markers from two organelle genomes with contrasted rates of gene flow to test these predictions by examining genetic exchanges between two morphologically distinct spruce Picea species growing in the Qinghai-Tibetan Plateau. • The haplotypes from both mitochondrial (mt) DNA and chloroplast (cp) DNA cluster into two distinct lineages that differentiate allopatric populations of the two species. By contrast, in sympatry, the species share the same haplotypes, suggesting interspecific genetic exchanges. As predicted by the neutral model, all sympatric populations of the expanding species had received their maternally inherited mtDNA from the resident species, whereas for paternally inherited cpDNA introgression is more limited and not strictly unidirectional. • Our results underscore cryptic introgressions of organelle DNAs in plants and the importance of considering rates of gene flow and range shifts to predict direction and extent of interspecific genetic exchanges.< Réduire

Mots clés

cpdna

mtdna

spruce

range expansion

plant sciences

Mots clés en anglais

introgression

gene flow