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Author's Personal Copy Author's personal copy Molecular Phylogenetics and Evolution 55 (2010) 580–598 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev A classification of the Chloridoideae (Poaceae) based on multi-gene phylogenetic trees Paul M. Peterson a,*, Konstantin Romaschenko a,b, Gabriel Johnson c a Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA b Botanic Institute of Barcelona (CSICÀICUB), Pg. del Migdia, s.n., 08038 Barcelona, Spain c Department of Botany and Laboratories of Analytical Biology, Smithsonian Institution, Suitland, MD 20746, USA article info abstract Article history: We conducted a molecular phylogenetic study of the subfamily Chloridoideae using six plastid DNA Received 29 July 2009 sequences (ndhA intron, ndhF, rps16-trnK, rps16 intron, rps3, and rpl32-trnL) and a single nuclear ITS Revised 31 December 2009 DNA sequence. Our large original data set includes 246 species (17.3%) representing 95 genera (66%) Accepted 19 January 2010 of the grasses currently placed in the Chloridoideae. The maximum likelihood and Bayesian analysis of Available online 22 January 2010 DNA sequences provides strong support for the monophyly of the Chloridoideae; followed by, in order of divergence: a Triraphideae clade with Neyraudia sister to Triraphis; an Eragrostideae clade with the Keywords: Cotteinae (includes Cottea and Enneapogon) sister to the Uniolinae (includes Entoplocamia, Tetrachne, Biogeography and Uniola), and a terminal Eragrostidinae clade of Ectrosia, Harpachne, and Psammagrostis embedded Classification Chloridoideae in a polyphyletic Eragrostis; a Zoysieae clade with Urochondra sister to a Zoysiinae (Zoysia) clade, and a Grasses terminal Sporobolinae clade that includes Spartina, Calamovilfa, Pogoneura, and Crypsis embedded in a Molecular systematics polyphyletic Sporobolus; and a very large terminal Cynodonteae clade that includes 13 monophyletic sub- Phylogenetic trees tribes. The Cynodonteae includes, in alphabetical order: Aeluropodinae (Aeluropus); Boutelouinae (Bout- Poaceae eloua); Eleusininae (includes Apochiton, Astrebla with Schoenefeldia embedded, Austrochloris, Brachyachne, Chloris, Cynodon with Brachyachne embedded in part, Eleusine, Enteropogon with Eustachys embedded in part, Eustachys, Chrysochloa, Coelachyrum, Leptochloa with Dinebra embedded, Lepturus, Lintonia, Micro- chloa, Saugetia, Schoenefeldia, Sclerodactylon, Tetrapogon, and Trichloris); Hilariinae (Hilaria); Monanthoch- loinae (includes Distichlis, Monanthochloe, and Reederochloa); Muhlenbergiinae (Muhlenbergia with Aegopogon, Bealia, Blepharoneuron, Chaboissaea, Lycurus, Pereilema, Redfieldia, Schaffnerella, and Schedon- nardus all embedded); Orcuttiinae (includes Orcuttia and Tuctoria); Pappophorinae (includes Neesiochloa and Pappophorum); Scleropogoninae (includes Blepharidachne, Dasyochloa, Erioneuron, Munroa, Scleropo- gon, and Swallenia); Traginae (Tragus with Monelytrum, Polevansia, and Willkommia all embedded); Tridentinae (includes Gouinia, Tridens, Triplasis, and Vaseyochloa); Triodiinae (Triodia); and the Tripogon- inae (Melanocenchris and Tripogon with Eragrostiella embedded). In our study the Cynodonteae still include 19 genera and the Zoysieae include a single genus that are not yet placed in a subtribe. The tribe Triraphideae and the subtribe Aeluropodinae are newly treated at that rank. We propose a new tribal and subtribal classification for all known genera in the Chloridoideae. The subfamily might have origi- nated in Africa and/or Asia since the basal lineage, the Triraphideae, includes species with African and Asian distribution. Published by Elsevier Inc. 1. Introduction (1815). That same year, Kunth (1833) published his Agrostographia Synoptica in which he recognized the following genera in the group The grass (Poaceae) subfamily Chloridoideae was first validly (Chlorideae): Chloris, Ctenium, Cynodon, Dactyloctenium, Eleusine, published by Beilschmied (1833), a German botanist and pharma- Eustachys, Gymnopogon, Harpochloa Kunth, Leptochloa, Microchloa, cist, who used an earlier description of sect. Chlorideae by Kunth Pleuraphis Torr., Schoenefeldia, Spartina, Triplasis, and 8 genera now treated as synonyms of Bouteloua. Clearly our modern under- standing of Chloridoideae is much greater, and there now appear to * Corresponding author. Address: Department of Botany, MRC-166, National be more than 1420 species in approximately 140 genera in the sub- Museum of Natural History, Smithsonian Institution, 10[th] and Constitution Avenue NW, Washington, DC 20013-7012, USA. Fax: +1 202 786 2563. family worldwide (Clayton et al., 2008; Watson and Dallwitz, E-mail address: [email protected] (P.M. Peterson). 1992b). 1055-7903/$ - see front matter Published by Elsevier Inc. doi:10.1016/j.ympev.2010.01.018 Author's personal copy P.M. Peterson et al. / Molecular Phylogenetics and Evolution 55 (2010) 580–598 581 The core species in the subfamily share two structural synapo- ported such as Schedonorus, sister to Lolium in the Poeae, and Ani- morphies: all exhibit Kranz or C4 leaf anatomy (except Eragrostis sopogon in the Phaenospermateae are included in their walteri Pilg. from South Africa; Ellis, 1984) and most have chlorid- Chloridoideae assemblage (Davis and Soreng, 2007). Placement of oid bicellular microhairs (broad, short terminal cell the same thick- these two genera in the Chloridoideae was based on each contain- ness as the basal cell) present on leaf surfaces. Two main subtypes ing a single rbcL sequence. Obviously, Schedonorus and Anisopogon of C4 photosynthesis, NAD-ME (nicotinamide adenine dinucleotide should have been omitted from their study. co-factor malic enzyme) and PCK (phosphoenolpyruvate carboxy- In our study, we provide the latest estimates of the phylogeny kinase), have been found and verified by biochemical assay to oc- within the Chloridoideae by analyzing six sequences from the plas- cur in Chloridoideae (Gutierrez et al., 1974; Brown, 1977; tid genome — rps3 (coding), rps16 intron, rps16-trnK (spacer), ndhF Hattersley and Watson, 1992). Ecologically, there appears to be (coding), ndhA intron, and rpl32-trnL (spacer); and one from the some separation in habitat preference according to C4 subtype (El- nuclear genome — ITS. To do this we assembled a large data set lis et al., 1980; Hattersley, 1992). The PCK subtype is thought to including 254 species in 99 genera. We compare phylogenetic trees represent an apomorphy in grasses because this C4 cycle appears based on ITS and plastid datasets, combine the data set in a total to be a modification of the NAD-ME subtype (Hattersley and Wat- evidence tree, discuss previous molecular and morphological stud- son, 1992). In addition, the PCK subtype is known only to occur in ies where appropriate, interpret biogeographical relationships, and grasses, whereas the NAD-ME subtype is also found in other mono- present a new classification for the subfamily. Based on our phylo- cot and dicot families (Hattersley and Watson, 1992; Peterson and genetic evidence we propose a change in rank for two taxa, the Herrera Arrieta, 2001). subtribe Triraphidinae and the tribe Aeluropodeae. Other character trends in Chloridoideae include a base chromo- some number of x = 10, fruits (caryopses) with nonlinear hila that 2. Materials and methods are usually punctiform or small, embryos with elongated mesoco- tyl internodes, and two non-membranous (fleshy) lodicules (Sor- 2.1. Taxon sampling eng and Davis, 1998; GPWG, 2001). However, most of these character trends are seen in the closely related subfamilies Aristi- The following 8 taxa were chosen as outgroups from the PAC- doideae, Arundinoideae, Centothecoideae, Danthonioideae, and CAD clade: one species of Danthonia (Danthonioideae), two species Panicoideae of the PACCAD clade. A recent morphological and eco- of Rytidosperma (Danthonioideae), two species of Aristida (Aristi- logical description of the subfamily is given in GPWG (2001). Some doideae), and three species of Chasmanthium (Centothecoideae or salient features include: plants herbaceous, rarely woody, occur- Centotheceae) (GPWG, 2001; Davis and Soreng, 2007). The Chlori- ring in dry climates, sheaths usually non-auriculate, inflorescence doideae subset of data is partitioned as following: six species of paniculate, racemose, or spicate, spikelets bisexual or unisexual tribe Triraphideae, 34 species (two multiple accessions) of tribe (plants monoecious or dioecious) with one to many fertile florets, Eragrostideae, 18 species of Zoysieae (one multiple accession) usually laterally compressed, usually disarticulating above the and 188 species (11 multiple accessions) of Cynodonteae. The data- glumes, palea well developed, lodicules usually two, fleshy, ovary set of Cynodonteae includes three species of subtribe Aeluropodi- glabrous, styles and stigmas two, caryopsis with pericarp often free nae, 10 species of Triodiinae, five species of Orcuttiinae, four or loose, hilum short, endosperm hard without lipid, embryo with species of Tridentinae, six species of Tripogoninae, 51 species of an epiblast (usually), scutellar cleft, and elongated mesocotyl (five multiple accessions) of Eleusininae, 11 species of Traginae, internode. one species (one multiple accession) of Hilariinae, three species The Chloridoideae have appeared monophyletic in all previous (one multiple accession) of Monanthochloinae, 13 species of molecular analyses, however the classification within the
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