Tertiary montane origin of the Central Asian flora, evidence inferred from cpDNA sequences of Atraphaxis (Polygonaceae). Issue 12 (23rd July 2014)

• Record Type: Journal Article
• Authors: Zhang, Ming‐Li; Sanderson, Stewart C.; Sun, Yan‐Xia; Byalt, Vyacheslav V.; Hao, Xiao‐Li
• Is Part Of: Journal of integrative plant biology. Volume 56:Issue 12(2014)
• Page Start: 1125
• Page End: 1135
• Publication Date: 2014-07-23
• Subjects: Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.12226
• Languages: English
• ISSNs: 1672-9072

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="jipb12226-sec-0001" sec-type="section"> <p> <italic>Atraphaxis</italic> has approximately 25 species and a distribution center in Central Asia. It has been previously used to hypothesize an origin from montane forest. We sampled 18 species covering three sections within the genus and sequenced five cpDNA spacers, <italic>atp</italic>B‐<italic>rbc</italic>L, <italic>psb</italic>K‐<italic>psb</italic>I, <italic>psb</italic>A‐<italic>trn</italic>H, <italic>rbc</italic>L, and <italic>trn</italic>L‐<italic>trn</italic>F. BEAST was used to reconstruct phylogenetic relationship and time divergences, and S‐DIVA and Lagrange were used, based on distribution area and ecotype data, for reconstruction of ancestral areas and events. Our results appear compatible with designation of three taxonomic sections within the genus. The generic stem and crown ages were Eocene, approximately 47 Ma, and Oligocene 27 Ma, respectively. The origin of <italic>Atraphaxis</italic> is confirmed as montane, with an ancestral area consisting of the Junggar Basin and uplands of the Pamir‐Tianshan‐Alatau‐Altai mountain chains, and ancestral ecotype of montane forest. Two remarkable paleogeographic events, shrinkage of the inland Paratethys Sea at the boundary of the late Oligocene and early Miocene, and the time intervals of cooling and drying of global climate from 24 (22) Ma onward likely facilitated early diversification of <italic>Atraphaxis</italic>, while rapid uplift of the Tianshan Mountains during the late Miocene may have promoted later diversification.</p> </sec> </abstract>