What is Atraphaxis L. (Polygonaceae, Polygoneae): cryptic taxa and resolved taxonomic complexity instead of the formal lumping and the lack of morphological synapomorphiesстатья

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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.

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1. Полный текст peerj-1977.pdf 16,1 МБ 3 мая 2016 [olgayurtseva]

[1] What is atraphaxis l. (polygonaceae, polygoneae): cryptic taxa and resolved taxonomic complexity instead of the formal lumping and the lack of morphological synapomorphies / O. Yurtseva, O. Kuznetsova, M. Mavrodieva, E. Mavrodiev // PeerJ. — 2016. — Vol. 4. — P. 1977. Backgrounds:The recently proposed recircumscription of the genusAtraphaxis(incl. AtraphaxissectionOvczinnikoviaO.V. Yurtseva ex. S. Tavakkoli andPolygonumsect. SpinescentiaBoissier (=A.sect.PolygonoidesS. Tavakkoli, Kaz. Osaloo & Mozaff.) makes this genus fairly heterogeneous and therefore almost undefinable based on morphology. The critical comprehensive reappraisal of the group is necessary. Methods:Using the DNA sequence data (ITS1&2 regions of nrDNA and combined trnL intron +trnL–F IGS and rpl32–trnL (UAG) IGS regions of plastid genome), Maximum Likelihood (ML) and Bayesian analyses (BI) were applied for phylogenetic reconstructions of the tribe Polygoneae with special attention to Atraphaxis, and related taxa. Maximum parsimony reconstructions of the evolution of perianth morphology and sporoderm ornamentation in the tribe Polygoneae were also performed. Life history, morphology of shoots, leaf blades, ocreas, perianth and achene morphology, ultrasculpture of achene surface, and pollen morphology were compared, and SEM and LM images were provided. Principal findings:The generaAtraphaxisandPolygonumwere found to be widely polyphyletic. The rarest and morphologically remarkable endemic of Tian-Shan and PamirAtraphaxis ovczinnikovii(Atraphaxissect.OvczinnikoviaO.V. Yurtseva ex. S. Tavakkoli) was confirmed to be a sister of the clade (Atraphaxis+Polygonumsect. Spinescentia) in plastid topology. The genusBactria (=Atraphaxissect. Ovczinnikovia), which circumscribes two species, is newly established as a result of this analyses. Morphological data confirm the originality of the taxon. Discussion:We are arguing for a narrow delimitation ofAtraphaxiswith petalloid segments and striato-perforate sporoderm ornamentation as morphological synapomorphies. The recently proposed inclusion ofPolygonumsect.Spinescentiain Atraphaxisis fairly questionable from a morphological standpoint. The rank of Polygonumsect.Spinescentiarequires further clarification. The generic composition of the tribe Polygoneae also requires future reappraisals. [ DOI ]

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