Perforated pit membranes in imperforate tracheary elements of some angiosperms
Perforated pit membranes in imperforate tracheary elements of some angiosperms
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DOI：
10.1093/aob/mc1049
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发表时间：
2006-06-01
期刊：
影响因子：
4.2
通讯作者：
Jansen, Steven
中科院分区：
文献类型：
--
作者：
San, Yuzou;Jansen, Steven
背景与目的被子植物的坑膜结构尚未被充分研究，我们对其结构的认识也不完整。因此，本研究旨在阐明不同科木本植物纤维和管胞孔膜的微观形态。方法采用两种方法制备了8科10属10种的标本，并用场发射扫描电镜进行了观察。平均直径< 4 μ m的纤维间坑膜经常穿孔或多孔。相比之下，无孔气管元件的凹穴膜均匀，微原纤维密集排列，凹穴边界明显，平均直径为>= 4 μ m。这些差异不仅在物种之间，而且在存在不同类型的不穿孔气管元件的单一物种内也一致观察到。结论纤维间窝膜的结构在不同的细胞类型中存在差异，这种差异与纤维细胞的特化密切相关。这表明，在特殊纤维之间穿孔的孔膜有助于纤维细胞在成熟时或成熟后不久脱水。
center dot Background and Aims The structure of pit membranes in angiosperms has not been fully examined and our understanding about the structure is incomplete. Therefore, this study aims to illustrate the micromorphology of pit membranes in fibres and tracheids of woody species from various families.center dot Methods Specimens from ten species from ten genera and eight families were prepared using two techniques and examined by field-emission scanning electron microscopy.center dot Key Results Interfibre pit membranes with an average diameter of < 4 mu m were frequently perforated or appeared to be very porous. In contrast, pit membranes in imperforate tracheary elements with distinctly bordered pits and an average diameter of >= 4 mu m were homogeneous and densely packed with microfibrils. These differences were observed consistently not only among species but also within a single species in which different types of imperforate tracheary elements were present.center dot Conclusions This study demonstrates that the structure of interfibre pit membranes differs among cell types and the differences are closely associated with the specialization of the fibre cells. It is suggested that perforated pit membranes between specialized fibres contribute to the dehydration of the fibre cells at or soon after maturation.