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The distribution and structure of pits between vessels and imperforate tracheary elements in angiosperm woods

机译:被子植物中脉管与无孔气管元件之间的凹坑分布与结构

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This study focuses on the interspecific variation in the distribution and structure of pits between vessels and imperforate tracheary elements. Specimens from the outer sapwood of eight species, in which vessel elements are frequently in contact with fibres and/or tracheids, were prepared using two different techniques and examined by field-emission scanning electron microscopy. In three species in which vessels are surrounded by vasicentric tracheids and/or fibres with distinctly bordered pits, pit pairs frequently occurred in walls between vessels and imperforate tracheary elements. In the five species in which vessels are in contact with fibres with indistinctly bordered pits, no or very few pit pairs were present, and blind pits were often found. Blind pits were exclusively present in vessel elements in some species, while they were restricted to imperforate tracheary elements in other species. The nature of vessel to imperforate tracheary element pitting appears to depend on tracheary element specialization.
机译:这项研究的重点是血管与无孔气管元件之间的凹坑分布和结构的种间变化。使用两种不同的技术制备了来自八种外边材的标本,在这些标本中,血管元素经常与纤维和/或气管接触,并通过场发射扫描电子显微镜对其进行了检查。在三个物种中,血管被以血管为中心的气管和/或纤维包围着,具有明显的凹坑,在容器和无孔气管元件之间的壁中经常出现凹坑对。在五个容器中,容器与带有不明显边界的凹坑的纤维接触的物种中,不存在或很少出现凹坑对,并且经常发现盲孔。在某些物种中,盲孔仅存在于血管元素中,而在其他物种中,盲孔只限于无孔气管元素。用于使气管元件点蚀无孔的血管的性质似乎取决于气管元件的专业化程度。

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