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Molecular evolution of the grass subfamily Panicoideae (Poaceae): based on sequences of chloroplast and nuclear DNA

ชื่อนักวิจัย

Atchara Teerawatananon, Trevor R. Hodkinson

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Plant Science and Plant Products, Taxonomic Classification of Organisms

ประเภทผลงาน

Conference Poster

บทคัดย่อ

Phylogenetic relationships among major subfamilies in Poaceae and among major tribes within Panicoideae were evaluated using parsimony analysis of plastid trnL‐F, atpB‐rbcL, and nuclear ITS gene regions. A total of 132 grasses from six subfamilies and representatives from five tribes of Panicoideae (Andropogoneae, Arundinelleae, Eriachneae, Isachneae, Paniceae) were analysed. The PACCMAD clade was well resolved. The close relationship between Aristidoideae and Chloridoideae was found. The monophyly of Micrairoideae was resolved. Eriachne and Isachne were resolved as monophyletic. Panicoideae were monophyletic and sister to a clade of Danthoniopsis + Tristachya. Paniceae were monophyletic. Within Paniceae, the bristle clade and the forest shade clade were found, but their circumscription remains ambiguous. Arundinelleae were polyphyletic. This study supported the separation of Arundinella and Garnotia from the remaining Arundinelleae and the inclusion of both genera in their own subtribes within Andropogoneae. Tribe Arundinelleae should be abandoned. Andropogoneae were monophyletic only if Arundinella and Garnotia were included. Five out of a total of 11 subtribes (Chionachninae, Coicinae, Dimeriinae, Germainiinae, Tripsacinae) were monophyletic. Five distinct groups, Hackelochloa, Hemarthria and Mnesithea, an agamic complex (Bothriochloa, Capillipedium, Dichanthium), a sub‐basal awn group (Arthraxon, Thelepogon), the core Andropogoneae genera (Hyparrhenia. Cymbopogon, Schizachyrium, Andropogon), and a Themeda group) were also found as monophyletic.