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Intraspecific genetic variation and biogeographic history of the arid relict shrub Amygdalus pedunculata (Rosaceae) in northwest China
Author(s) -
Wei Bo,
Zhang Lin,
Ma SongMei,
Ren ChenRong,
Nie YingBin,
Sun FangFang
Publication year - 2021
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/njb.02867
Subject(s) - biology , analysis of molecular variance , range (aeronautics) , shrub , genetic diversity , ecology , population , genetic variation , genetic structure , botany , genetics , demography , materials science , sociology , gene , composite material
We studied the arid shrub Amygdalus pedunculata to better understand biogeographic histories and the impact of climate fluctuations during the Quaternary in shaping genetic variation and in northwest China. Three chloroplast DNA intergenic spacers ( psb K‐ psb I, trn L‐ trn F and trn V) were sequenced in 129 individuals from 10 populations across the range of A. pedunculata , and 17 haplotypes were identified, with one haplotype that was distributed across all sampled populations. High levels of total gene diversity ( H T = 0.965) and within‐population diversity ( H S = 0.669) were identified. Analysis of molecular variance (AMOVA) indicated that most genetic variation occurred within populations. Neutrality tests and mismatch distribution analysis suggested past range expansions of A. pedunculata . As such, A. pedunculata has likely undergone a substantial postglacial range expansion northward and southward along the margins of the northern Yin Mountains and Mu Us Desert, respectively. Principal coordinate analyses, median‐joining network analysis and Beast analysis revealed that 17 haplotypes mainly formed three clusters, corresponding to the Northern (Damao Banner) and Central (Wula Mountains and Guyang County) regions of Inner Mongolia and the Southern region (Bulang Township) in northern Shannxi. The local adaptative differentiation is speculated to have occurred among the three regions mainly resulting from geographical isolation caused by the uplift and extension of the Yinshan Mountains during the Quaternary.