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Inclusion of Cephalotaxus in Taxaceae: Evidence from morphology and anatomy 원문보기

식물분류학회지 = Korean journal of plant taxonomy, v.48 no.2, 2018년, pp.109 - 114  

GHIMIRE, Balkrishna (Plant Conservation Division, Korea National Arboretum) ,  JEONG, Mi-Jin (Plant Conservation Division, Korea National Arboretum) ,  LEE, Chunghee (Gardens and Education Division, Korea National Arboretum) ,  HEO, Kweon (Department of Applied Plant Sciences, Kangwon National University)

Abstract ▼ AI-Helper 아이콘AI-Helper

The inconsistent relationship between the monogeneric family Cephalotaxaceae and Taxaceae was discussed and the possibility of merging Cephalotaxus within Taxaceae was also reviewed. Our previous reports (cladistics analysis, leaf anatomy and wood anatomy of Taxaceae s.l.) did not find a feasible re...

주제어

#Cephalotaxaceae   #Cephalotaxus   #Taxaceae  

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성능/효과

  • Leaf anatomical structures of six genera were very similar each other in tissue type and their arrangements. Taxus, Austrotaxus, and Pseudotaxus were without foliar resin canal, whereas Amentotaxus, Cephalotaxus, and Torreya had single foliar resin canal situated below the vascular bundle. Among the six genera, Torreya was unique with thick walled almost rounded sclerenchymatous epidermal cells.
  • The result of leaf anatomy suggested that Cephalotaxus in one hand resembles with Torreya-Amentotaxus by having resin canal and on the other hand it shares parenchymatous epidermis and similar palisade layers with Taxus-Pseudotaxus. This result is somehow similar with the previous studies in which the genus has generally resolved as either sister to Torreya-Amentotaxus clade or sometimes allied with Taxus clade (Kershaw et al.
  • The Taxus and Torreya resembled each other as the wood of both genera lack axial parenchyma. This indicated that only limited variation in wood features was observed in the five genera of Taxaceae s.l.; in fact, the explanation could be same for six genera because most of the wood features of the monotypic genus Pseudotaxus closely resemble taxad genera, particularly Taxus.
  • This paper discussed whether it is still reasonable to classified Cephalotaxus under monotypic family Cephalotaxaceae or it’s better to merge within close relative Taxaceae.

후속연구

  • (2014) found that Cephalotaxus is strongly supported to be sister to Taxaceae based on either LFY or LFY + NLY CDS, but is weekly nested within Taxaceae based on NLY. Based on this fact they realized that such unpredictable relationship of Cephalotaxus with Taxaceae in the different analysis could be instigated by long branch attraction artifacts or inadequate resolution of markers and thus still some additional studies are needed to resolve the relationship between these two groups.
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