Phylogeny of Poaceae Inferred from matK Sequences

Abstract

Complete sequences of the plastic1 gene mcrtK \+-eredetermined for 62 species of Poaceae from 6 0 genera. 2 6 tribes. and nine iul~fanliliesto infer phylogenetic relatiollsllips. Rrsfio tetr-upli~llus(Restionaceae) ant1 .loinl illea ascendens (Joi~l\illeacrae) were used as outgroups. Clatlistic. analysis using PAUP)ieltletl 3 9 most parsimo~lioustrees \+-it11several well-supl~orteclmajor lineages. Tlle strict conse~lsusLree she\+-s S~reptocl~cre~a and 4~iomochlocrforming the two most basal lineages in grasses. follo~+-ecl 11) I'licrl-us 11eing sister to the remaining species. The other grasses divide into three clades: (1) sul~fanlil) Banll~~~soitleae (exclucli~lgRrcrchje!,~r7c~ii) plus Pooideae: (2) Oryzoicleae: and (3) s~ll~fanlilies Panicoideae. Ar~lntli~loitleae. monopllyly Cento~hecoideae.ancl Chloridoideae (termed PACC). EacepL for A~~~~~~c l i n o i c l e a e. of each P.1CC subfamily is generally well supported; h o~\ e \ e n relationships among subfamilies are unresolved or weakly supportetl. Results ol~tai~lecl using 117crtK sequences are largely consistent wit11 other phylogenies l~asecl on molecular ancl s~ructural data. particularly in that relationsllips among subfamilies remain ~~n c l e a r. We h a n k Nigel Barker. Lynn Clark. Travis Columbus. Jerr! Davis. Tarciso Filgueiras. Gal? Fleming, Surrey Jac.ol)s. Davicl Kneppet A. Nishiwaki. John Randall, Thomas W'iebolclt, the Botallical Garden at Bo~ill.ant1 the hlissouri Botanical Garden for supplying DNA or plant samples. Seecl material for some accessions was kindl) provided 11) the

Numerical Taxonomic Study of Some Tribes of Gramineae from Egypt

“…Brachypodium is the sister-group of a clad including both Bromus and the Triticeae. While, [5] illustrated that the relationships between Bromus and the Triticeae is unresolved, so there is a possibility that the Triticeae is a non-monophyletic group. Meanwhile, in our results, the Triticeae is a monophyletic sister-group to the neighboring clad of Triticeae, Poeae, Bromeae, Brachypodieae and Aveneae (sub-clad 3).…”

“…Many attempts have been made to address phylogenetic relationships of Chloridoideae; synonym Eragrostoideae that comprises approximately 146 genera and 1360 species, whose adoption of efficient C4 photosynthesis had led to its successful proliferation in the tropics and subtropics [1]; mainly based on the basis of morphological and molecular data [4,5], but general agreement is still lacking. The grass tribe Triticeae includes some of the world's most important cereals and a significant number of important forage grasses [6].…”

A classification of the Chloridoideae (Poaceae) based on multi-gene phylogenetic trees

“…Clayton and Renvoize (1986) pointed out that Triraphis was perhaps an ally of Neyraudia since both genera possess slender panicoid-like microhairs and the two have keeled lemmas that are villous on the lateral nerves (Watson and Dallwitz, 1992a). Hilu and Alice (2001) and Bouchenak-Khelladi et al (2008) who both used the same matK sequence place this taxon in the Uniolinae. We have ITS and rps16-spacer sequences support (although only weakly) for Tetrachne as sister to Uniola.…”

“…The Chloridoideae have appeared monophyletic in all previous molecular analyses, however the classification within the subfamily, until recently, has been controversial ( Van den Borre and Watson, 1997;Soreng and Davis, 1998;Hsiao et al, 1999;Hilu and Alice, 2001;Roodt-Wilding and Spies, 2006;Columbus et al, 2007;Peterson et al, 2007;Soreng et al, 2009). Earlier studies based entirely on morphological characters, while not entirely misleading in depicting closely related genera, were often erroneous in elucidating evolutionary alignment of the tribes (Hilu and Wright, 1982;Van den Borre and Watson, 1997).…”

Sequence variation at the three chloroplast loci (matK, rbcL, trnH-psbA) in the Triticeae tribe (Poaceae): comments on the relationships and utility in DNA barcoding of selected species

“…The full-length sequences of matK and rbcL (both of about 1.5 kb) were successfully applied to analyze the interspecific phylogenetic relationships among the land plants, including members of the Poaceae family (e.g. Hilu et al 1999).…”