Phylogeny and biogeography of Calamagrostis (Poaceae: Pooideae: Poeae: Agrostidinae), description of a new genus, Condilorachia (Calothecinae), and expansion of Greeneochloa and Pentapogon (Echinopogoninae)  

作　　者：Paul M.Peterson Robert J.Soreng Konstantin Romaschenko Patricia Barberá Alejandro Quintanar Carlos Aedo Jeffery M.Saarela 

机构地区：[1]Department of Botany,National Museum of Natural History,Smithsonian Institution,Washington,DC 20013-7012,USA [2]Department of Africa and Madagascar,Missouri Botanical Garden,St.Louis,MO 63110-2291,USA [3]Herbarium MA,Unidad de Herbarios,Real Jardín Botánico,Consejo Superior de Investigaciones Cientificas,Madrid 28014,Spain [4]Department of Biodiversity and Conservation,Real Jardín Botánico,Consejo Superior de Investigaciones Cientificas,Madrid 28014,Spain [5]Beaty Centre for Species Discovery and Botany Section,Research and Collections,Canadian Museum of Nature,Ottawa,ON KIP 6P4,Canada

出　　处：《Journal of Systematics and Evolution》2022年第3期570-590,共21页植物分类学报（英文版）

基　　金：the Flora Iberica project(CGL2014–52787–C3–1–P,CGL2012–32914,CGL201785204-C3-1-P);the FPI fellowship BES-2012-053754 to P.Barberá;the National Geographic Society Committee for Research and Exploration(Grant Nos.8848-10,8087-06)for field and laboratory support;the Smithsonian Institution's Restricted Endowments Fund;the Scholarly Studies Program,Research Opportunities,Atherton Seidell Foundation,Biodiversity Surveys and Inventories Program,Small Grants Program;the Laboratory of Analytical Biology;the United States Department of Agriculture.

摘　　要：To investigate the evolutionary relationships and biogeographical history among the species of Calamagrostis and other members of subtribes Agrostidinae,Calothecinae,Echinopogoninae,and Paramochloinae,we generated a phylogeny based on DNA sequences from one nuclear ribosomal(ITS)and three plastid regions(rpl32-trnL spacer,rps16-trnK spacer,and rps16 intron).Based on our phylogeny,we identified seven species groups(clades)within Calamagrostis:the Meridionalis group comprises two species from Central and South America,the Americana group comprises species from North America,the Deyeuxia and Epigeios groups comprise species from Eurasia,the Orientalis group comprises species from East Asia,the Purpurea group comprises species from Eurasia and North America,and the Calamagrostis group comprises species from Eurasia and North America.We hypothesize that Calamagrostis originated in North America with the primary split of the Meridionalis group,followed by split between the autochthonous Americana group and two future Eurasian branches encompassing all the remaining groups,which possibly dispersed into Eurasia independently.The molecular data suggest that hybridization and genomic introgression played a prominent role in the evolutionary history of Calamagrostis.We propose a new genus,Condilorachia,segregated from Trisetum s.l.,with three species from South America for which we propose new combinations:Condilorachia bulbosa,Condilorachia brasiliensis,and Condilorachia juergensii;a new combination in Greeneochloa,Greeneochloa expansa;and the subsumption of Dichelachne into Pentapogon with 20 new combinations:Pentapogon avenoides,Pentapogon brassii,Pentapogon chaseianus,Pentapogon crinita,Pentapogon densus,Pentapogon frigidus,Pentapogon gunnianus,Pentapogon hirtella,Pentapogon inaequiglumis,Pentapogon lautumia,Pentapogon micrantha,Pentapogon parva,Pentapogon quadrisetus,Pentapogon rara,Pentapogon robusta,Pentapogon scaberulus,Pentapogon sclerophyllus,Pentapogon suizanensis,Pentapogon sieberiana,and Pentapogon validus.We p

关 键 词：Calamagrostis Dichelachne grasses Greeneochloa ITS molecular systematics Pentapogon plastid sequences taxonomy 

分 类 号：Q95[生物学—动物学]