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Direction and extent of organelle DNA introgression between two spruce species in the Qinghai‐Tibetan Plateau
Author(s) -
Du Fang K.,
Peng Xiao Li,
Liu Jian Quan,
Lascoux Martin,
Hu Feng Sheng,
Petit Rémy J.
Publication year - 2011
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2011.03853.x
Subject(s) - introgression , biology , gene flow , allopatric speciation , sympatry , mitochondrial dna , sympatric speciation , range (aeronautics) , interspecific competition , chloroplast dna , evolutionary biology , species complex , ecology , genome , genetic variation , genetics , gene , population , phylogenetic tree , demography , materials science , sociology , composite material
Summary• 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.