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Journal of Arid Land  2012, Vol. 4 Issue (2): 180-190    DOI: 10.3724/SP.J.1227.2012.00180
Research Articles     
Molecular phylogeny of tribe Atraphaxideae (Polygonaceae) evidenced from five cpDNA genes
YanXia SUN1, MingLi ZHANG 1,2
1 Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2 Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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Abstract  Traditionally, Atraphaxis, Calligonum, Pteropyrum and Parapteropyrum are included in the tribe Atraphxideae. Recently, sequence data has revealed that this tribe is not monophyletic. The structure of the tribe was examined by adding more taxa and sequences to clarify the congruence between morphology and molecular phylogeny, the systematic placements of four genera in Polygonaceae, as well as the infra-generic relationships of Atraphaxis and Calligonum within Atraphaxideae. Five chloroplast genes, atpB-rbcL, psbA-trnH, trnL–trnF, psbK-psbI, and rbcL of Atraphaxis, Calligonum, Pteropyrum, and Parapteropyrum were sequenced. The non-monophyly of Atraphaxideae was confirmed. Atraphaxis and Calligonum, respectively, formed a monophyletic group that was well supported. Calligonum is closely related to Pteropyrum; Atraphaxis is sister to Polygonum s. str.; and Parapteropyrum is allied with Fagopyrum. Although the morphology suggested the four genera should form a tribe, the molecular data indicated Atraphaxideae was not one monophyletic group. The clades identified within Atraphaxis corresponded well with the current sectional classification based on morphological features. As for Calligonum, Medusa was identified as a non-monophyletic section

Key wordsnitrogen addition      species richness      biomass      functional group      temperate steppe      Duolun, Inner Mongolia     
Received: 15 September 2011      Published: 06 June 2012

Chinese Academy of Sciences Important Direction for Knowledge Innovation Project (KZCX2-EW-305), Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences.

Corresponding Authors: MingLi ZHANG     E-mail:
Cite this article:

YanXia SUN, MingLi ZHANG. Molecular phylogeny of tribe Atraphaxideae (Polygonaceae) evidenced from five cpDNA genes. Journal of Arid Land, 2012, 4(2): 180-190.

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