Contributions to the Wood Anatomy of the Rubioideae (Rubiaceae)
Contributions to the Wood Anatomy of the Rubioideae (Rubiaceae)
复制标题
对茜草科（茜草科）木材解剖学的贡献
作者：
S. Jansen;F. Lens;S. Ntore;F. Piesschaert;E. Robbrecht;E. Smets
也包括虎刺属、粗叶木属、红景天属和毛蕊花属。木材解剖特征进行了比较，最近的系统发育的见解到研究组的基础上的分子数据。观察表明，划定和分离的几个分类群从以前的missareeae/Morindeae/Prismatomerideae/Psychotrieae聚集木材解剖数据的支持。紫堇科与其它茜草亚科的区别在于其薄壁组织稀少，具隔膜的纤毛状纤维，以及单列和非常高的多列射线与鞘细胞的结合。轴向薄壁组织带和纤维管胞包括Gynochtodes和巴戟天属的一些种，但后一属在几个特征（例如导管分组和轴向薄壁组织分布）方面是可变的。木材数据支持将Rennellia和Prismatomeris与Morindeae s.str.分离;导管在这两个属都是完全单生的，轴向薄壁组织总是弥散到弥散在聚集体中。Dammacanthus不同于Morindeae联盟的隔膜纤维的发生，轴向薄壁组织的情况下，偶尔存在的纤维壁增厚。有有趣的相似之处，如轴向薄壁组织细胞的螺旋增厚的零星发生的成员粗叶木分支和Pauriidiantheae/Urophyleae组。
Damnacanthus, Lasianthus, Saldinia, and Trichostachys are also included. Wood anatomical characters are compared with recent phylogenetic insights into the study group on the basis of molecular data. The observations demonstrate that the delimitation and separation of several taxa from the former Coussareeae/Morindeae/Prismatomerideae/Psychotrieae aggregate is supported by wood anatomical data. The Coussareeae can be distinguished from the other Rubioideae by their scanty parenchyma, septate libriform fibres, and the combination of uniseriate and very high multiseriate rays with sheath cells. Axial parenchyma bands and fibre-tracheids characterise Gynochtodes and some species of Morinda (Morindeae s.str.), but the latter genus is variable with respect to several features (e.g. vessel groupings and axial parenchyma distribution). Wood data support separation of Rennellia and Prismatomeris from Morindeae s.str.; vessels in both genera are exclusively solitary and axial parenchyma is always diffuse to diffuse-in-aggregates. Damnacanthus differs from the Morindeae alliance by the occurrence of septate fibres, absence of axial parenchyma, and the occasional presence of fibre wall thickenings. There are interesting similarities between members of the Lasianthus clade and the Pauridiantheae/Urophyleae group such as the sporadic occurrence of spiral thickenings in axial parenchyma cells.