CiteULike

Delicious

Connotea

Citation for Study 10328

Citation title: "A Molecular Phylogeny of North American Atripliceae (Chenopodiaceae), with Implications for Floral and Photosynthetic Pathway Evolution".

Study name: "A Molecular Phylogeny of North American Atripliceae (Chenopodiaceae), with Implications for Floral and Photosynthetic Pathway Evolution".

This study is part of submission 10318 (Status: Published).

Citation

Zacharias E.H., & Baldwin B.G. 2010. A Molecular Phylogeny of North American Atripliceae (Chenopodiaceae), with Implications for Floral and Photosynthetic Pathway Evolution. Systematic Botany, .

Authors

• Zacharias E.H. (submitter) 617-496-8514
• Baldwin B.G. 510-643-7008

Abstract

A phylogenetic investigation of American Atripliceae (Chenopodiaceae) was conducted to examine evolutionary patterns and ecophysiological change in the North American lineages. Molecular phylogenetic analyses including representatives of all American genera of Atripliceae and data from 18S-26S nuclear ribosomal (ITS, ETS) and chloroplast (3?trnK intron) DNA sequences suggest that neither Atriplex, as traditionally recognized, nor the North American members of Atriplex constitute a monophyletic group. Congruence between well-supported nuclear and chloroplast clades and results of expanded leaf anatomical and isotopic analyses indicate that American taxa belong to two distantly related lineages with different photosynthetic pathways; only one shift from C3 to C4 photosynthesis is required to explain photosynthetic pathway evolution in sampled lineages of Atripliceae. Conservatism in photosynthetic pathway evolution in the tribe is exemplified by the endemic, C3 North American Atriplex taxa, which are nested among other genera (e.g., Grayia, Holmbergia, Zuckia) within a robust C3 clade. One North American C3 genus, Suckleya, often included within Atripliceae should be excluded from the tribe. A previous hypothesis of variation in photosynthetic pathway within Atriplex phyllostegia sensu H. M. Hall and Clem. is rejected. A revised taxonomy employing only monophyletic groups reflects this new understanding of relationships within the tribe. Extriplex includes E. californica (comb. nov.) and E. joaquinana (comb. nov.) and has not been recognized as a natural group by previous authors. Stutzia is proposed to replace the name Endolepis Torr. (1860), a later homonym of Endolepis Schleid. (1846), and includes S. covillei (comb. nov.) and S. dioica (comb. nov.). Grayia (G. plummeri, comb. nov., and G. arizonica, comb. nov.) is expanded to include Zuckia. Recognition of Proatriplex as distinct from Atriplex is supported. Holmbergia is retained in Atripliceae. The improved phylogenetic understanding of Atripliceae should allow for more meaningful comparative studies of physiological and other functional adaptations of Atriplex, especially in North America.

Keywords

Atriplex, C4 photosynthesis, Endolepis, Extriplex, Grayia, Proatriplex, Stutzia, Zuckia

External links

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S10328
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref18817,
  	 author = {Elizabeth Hill Zacharias and Bruce G. Baldwin},
  	 title = {A Molecular Phylogeny of North American Atripliceae (Chenopodiaceae), with Implications for Floral and Photosynthetic Pathway Evolution},
  	 year = {2010},
  	 keywords = {Atriplex, C4 photosynthesis, Endolepis, Extriplex, Grayia, Proatriplex, Stutzia, Zuckia},
  	 doi = {},
  	 url = {http://},
  	 pmid = {},
  	 journal = {Systematic Botany},
  	 volume = {},
  	 number = {},
  	 pages = {},
  	 abstract = {A phylogenetic investigation of American Atripliceae (Chenopodiaceae) was conducted to examine evolutionary patterns and ecophysiological change in the North American lineages.  Molecular phylogenetic analyses including representatives of all American genera of Atripliceae and data from 18S-26S nuclear ribosomal (ITS, ETS) and chloroplast (3?trnK intron) DNA sequences suggest that neither Atriplex, as traditionally recognized, nor the North American members of Atriplex constitute a monophyletic group.  Congruence between well-supported nuclear and chloroplast clades and results of expanded leaf anatomical and isotopic analyses indicate that American taxa belong to two distantly related lineages with different photosynthetic pathways; only one shift from C3 to C4 photosynthesis is required to explain photosynthetic pathway evolution in sampled lineages of Atripliceae.  Conservatism in photosynthetic pathway evolution in the tribe is exemplified by the endemic, C3 North American Atriplex taxa, which are nested among other genera (e.g., Grayia, Holmbergia, Zuckia) within a robust C3 clade.  One North American C3 genus, Suckleya, often included within Atripliceae should be excluded from the tribe.  A previous hypothesis of variation in photosynthetic pathway within Atriplex phyllostegia sensu H. M. Hall and Clem. is rejected.  A revised taxonomy employing only monophyletic groups reflects this new understanding of relationships within the tribe.  Extriplex includes E. californica (comb. nov.) and E. joaquinana (comb. nov.) and has not been recognized as a natural group by previous authors.  Stutzia is proposed to replace the name Endolepis Torr. (1860), a later homonym of Endolepis Schleid. (1846), and includes S. covillei (comb. nov.) and S. dioica (comb. nov.).  Grayia (G. plummeri, comb. nov., and G. arizonica, comb. nov.) is expanded to include Zuckia.  Recognition of Proatriplex as distinct from Atriplex is supported.  Holmbergia is retained in Atripliceae.  The improved phylogenetic understanding of Atripliceae should allow for more meaningful comparative studies of physiological and other functional adaptations of Atriplex, especially in North America.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 18817
  AU  - Zacharias,Elizabeth Hill
  AU  - Baldwin,Bruce G.
  T1  - A Molecular Phylogeny of North American Atripliceae (Chenopodiaceae), with Implications for Floral and Photosynthetic Pathway Evolution
  PY  - 2010
  KW  - Atriplex
  KW  - C4 photosynthesis
  KW  - Endolepis
  KW  - Extriplex
  KW  - Grayia
  KW  - Proatriplex
  KW  - Stutzia
  KW  - Zuckia
  UR  - http://dx.doi.org/
  N2  - A phylogenetic investigation of American Atripliceae (Chenopodiaceae) was conducted to examine evolutionary patterns and ecophysiological change in the North American lineages.  Molecular phylogenetic analyses including representatives of all American genera of Atripliceae and data from 18S-26S nuclear ribosomal (ITS, ETS) and chloroplast (3?trnK intron) DNA sequences suggest that neither Atriplex, as traditionally recognized, nor the North American members of Atriplex constitute a monophyletic group.  Congruence between well-supported nuclear and chloroplast clades and results of expanded leaf anatomical and isotopic analyses indicate that American taxa belong to two distantly related lineages with different photosynthetic pathways; only one shift from C3 to C4 photosynthesis is required to explain photosynthetic pathway evolution in sampled lineages of Atripliceae.  Conservatism in photosynthetic pathway evolution in the tribe is exemplified by the endemic, C3 North American Atriplex taxa, which are nested among other genera (e.g., Grayia, Holmbergia, Zuckia) within a robust C3 clade.  One North American C3 genus, Suckleya, often included within Atripliceae should be excluded from the tribe.  A previous hypothesis of variation in photosynthetic pathway within Atriplex phyllostegia sensu H. M. Hall and Clem. is rejected.  A revised taxonomy employing only monophyletic groups reflects this new understanding of relationships within the tribe.  Extriplex includes E. californica (comb. nov.) and E. joaquinana (comb. nov.) and has not been recognized as a natural group by previous authors.  Stutzia is proposed to replace the name Endolepis Torr. (1860), a later homonym of Endolepis Schleid. (1846), and includes S. covillei (comb. nov.) and S. dioica (comb. nov.).  Grayia (G. plummeri, comb. nov., and G. arizonica, comb. nov.) is expanded to include Zuckia.  Recognition of Proatriplex as distinct from Atriplex is supported.  Holmbergia is retained in Atripliceae.  The improved phylogenetic understanding of Atripliceae should allow for more meaningful comparative studies of physiological and other functional adaptations of Atriplex, especially in North America.
  L3  - 
  JF  - Systematic Botany
  VL  - 
  IS  - 
  ER  -