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Panicoideae is the second-largest subfamily of the grasses with over 3,500 species, mainly distributed in warm temperate and tropical regions.[1] It comprises some important agricultural crops, including sugarcane , maize (or corn), sorghum , and switchgrass .
C 4 photosynthesis evolved independently a number of times in the subfamily, which presumably had a C 3 ancestor.[2]
Description
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The ligule has a fringe of hairs. The inflorescence is branched around a common axis. The spikelets are all alike with two bisexual florets that are joined below the glumes (the outer floral envelopes). The lower glume is shorter than the spikelet.[3]
Systematics and taxonomy
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Within the PACMAD clade of grasses, the Panicoideae are sister to a clade made of the four subfamilies Arundinoideae , Chloridoideae , Danthonioideae , and Micrairoideae .[2] A modern phylogenetic classification divides the Panicoideae in twelve tribes corresponding to monophyletic clades; two genera, Chandrasekharania and Jansenella , are unplaced (incertae sedis ) but probably belong to tribe Tristachyideae .[1] The three largest tribes, Paniceae , Paspaleae , and Andropogoneae , together with the small Arundinelleae , form the core of the subfamily. The Gynerieae were formerly placed in Arundinoideae, and the basal lineage, the "centothecoid clade" with seven tribes, was formerly seen as separate subfamily, Centothecoideae.[1]
Phylogeny based on chloroplast DNA analyses, showing relationships of tribes within the subfamily (dashed lines indicate uncertain positions; C4 clades flagged):[1] [2] [4] [5]
Gallery
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See Also
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References
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^ a b c d e Soreng, Robert J.; Peterson, Paul M.; Romschenko, Konstantin; Davidse, Gerrit; Zuloaga, Fernando O.; Judziewicz, Emmet J.; Filgueiras, Tarciso S.; Davis, Jerrold I.; Morrone, Osvaldo (2015). "A worldwide phylogenetic classification of the Poaceae (Gramineae)". Journal of Systematics and Evolution . 53 (2 ): 117–137. doi :10.1111/jse.12150 . hdl :11336/25248 . ISSN 1674-4918 . S2CID 84052108 .
^ a b c Grass Phylogeny Working Group II (2012). "New grass phylogeny resolves deep evolutionary relationships and discovers C4 origins". New Phytologist . 193 (2 ): 304–312. doi :10.1111/j.1469-8137.2011.03972.x . hdl :2262/73271 . ISSN 0028-646X . PMID 22115274 .
^ Koekemoer, Marinda (2014). Guide to plant families of southern Africa . H. M. Steyn, S. P. Bester (2nd ed.). Pretoria. ISBN 978-1-919976-92-1 . OCLC 890117816 . {{cite book }}
: CS1 maint: location missing publisher (link )
^ Morrone, Osvaldo; Aagesen, Lone; Scataglini, Maria A.; Salariato, Diego L.; Denham, Silvia S.; Chemisquy, Maria A.; Sede, Silvana M.; Giussani, Liliana M.; Kellogg, Elizabeth A.; Zuloaga, Fernando O. (2012). "Phylogeny of the Paniceae (Poaceae: Panicoideae): integrating plastid DNA sequences and morphology into a new classification". Cladistics . 28 (4 ): 333–356. doi :10.1111/j.1096-0031.2011.00384.x . ISSN 0748-3007 . PMID 34836451 . S2CID 86258463 .
^ Besnard, G.; Christin, P.-A.; Male, P.-J. G.; Coissac, E.; Ralimanana, H.; Vorontsova, M. S. (2013). "Phylogenomics and taxonomy of Lecomtelleae (Poaceae), an isolated panicoid lineage from Madagascar" . Annals of Botany . 112 (6 ): 1057–1066. doi :10.1093/aob/mct174 . ISSN 0305-7364 . PMC 3783238 . PMID 23985988 .
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Panicoideae&oldid=1234350467 "
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