COMPARATIVE WOOD ANATOMY OF FOUR Vernonia delile SPECIES (ASTERACEAE) IN SOUTHWESTERN NIGERIA.

T. A. Abeegunrin
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Abstract

Wood anatomy of four Vernonia Delile species in Southwestern States of Nigeria was investigated with a view to identifying the anatomical features of the genus that could be used to delimit the taxa. Plant samples were collected from Oyo, Ekiti, Osun and Ondo States. Transverse, tangential and radial longitudinal sections were made from the wood of the species of Vernonia using Reichert sliding microtome at 10μm thickness. The woods were also macerated with Schultze's uid to separate the tissues and cells. The macerates and cut sections were stained with Safranine O reagent to reveal the differences in tissue arrangements, shapes and cell inclusions. The four species showed common anatomical features: pore shape at transverse plane are oval, round, rectangular circular to cylindrical, simple pitting of vessel elements and presence of - uniseriate, biseriate and multiseriate rays. The wood characteristics that can be used to distinguish the taxa are absent and presence of : tylose, bre length and percentage of solitary vessel, axial parenchyma type and its absence. These features conferred signicant taxonomic difference in the species and members were categorized into three major groups. These ndings serve as baseline for further research such as molecular studies.
尼日利亚西南部四个 Vernonia delile 品种(ASTERACEAE)的木材解剖比较。
对尼日利亚西南部各州的四种 Vernonia Delile 树种的木材解剖结构进行了研究,以确定该属的解剖特征,从而用于划分类群。植物样本采集自奥约州、埃基迪州、奥孙州和翁多州。使用 Reichert 滑动显微切片机对 Vernonia 树种的木材进行了横向、切向和径向纵向切片,切片厚度为 10 微米。木材还用 Schultze's uid 进行浸渍,以分离组织和细胞。用 Safranine O 试剂对浸渍液和切片进行染色,以显示组织排列、形状和细胞内含物的差异。四个树种表现出共同的解剖学特征:横向孔隙形状有椭圆形、圆形、矩形、圆形到圆柱形,血管元素有简单的点蚀,存在单列、双列和多列射线。可用于区分分类群的木材特征有:无木糖和有木糖、bre 长度和单根血管的百分比、轴向实质类型和无轴向实质类型。这些特征在分类学上给物种带来了显著cant,其成员被分为三大类。这些 ndings 可作为分子研究等进一步研究的基线。
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