Phylogenetic Relationships in the Salicornioideae / Suaedoideae / Salsoloideae s.l. (Chenopodiaceae) Clade and a Clarification of the Phylogenetic Position of Bienertia and Alexandra Using Multiple DNA Sequence Datasets
The Chenopodiaceae includes taxa with both C3 and C4 photosynthesis with diverse kinds of Kranz anatomy and single-celled C4 species without Kranz anatomy; thus, it is of key importance for understanding evolution of C4 photosynthesis. All
of the C4 genera except Atriplex, which belongs to Chenopodioideae, are in the Salicornioideae / Suaedoideae / Salsoloideae s.l. (including Camphorosmeae and Sclerolaeneae) clade. Our study focused on the relationships of the main lineages within this clade with an emphasis
on the placement of the single cell functioning C4 genus Bienertia using maximum parsimony, maximum likelihood, and Bayesian inference phylogenetic analyses of the nuclear ribosomal ITS and five chloroplast DNA regions (atpB-rbcL, matK, psbB-psbH, rbcL,
and trnL-trnF). Further we provide a detailed phylogeny of Alexandra and Suaeda based on ITS, atpB-rbcL, and psbB-psbH. Our molecular data provide strong statistical support for the monophyly of: (1) a Salicornioideae / Suaedoideae / Salsoloideae
s.l. clade; (2) a Salicornioideae / Suaedoideae clade; (3) the subfamilies Salicornioideae, Suaedoideae (including Bienertia) and Salsoloideae s.l.; (4) the tribes Suaedeae, Salsoleae, and Camphorosmeae; (5) the Salicornieae if Halopeplideae is included; and (6) Suaeda if Alexandra
is included. Alexandra lehmannii is therefore reclassified as
Suaeda lehmannii
and a new section of Suaeda is created, section
Alexandra.
There are four independent origins of C4 photosynthesis within the Suaedoideae including two parallel
origins of Kranz C4 anatomy (in Suaeda sections Salsina s.l. and Schoberia) and two independent origins of C4 systems without Kranz anatomy (in Bienertia and in Suaeda section Borszczowia).
Keywords: ALEXANDRA; AMARANTHACEAE; CHENOPODIACEAE; GENERIC CIRCUMSCRIPTION; PHOTOSYNTHETIC PATHWAY EVOLUTION; SUAEDA
Document Type: Regular Paper
Publication date: 01 July 2006
- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
2011 Impact Factor: 1.517
2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences
34/45 - Evolutionary Biology - Editorial Board
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