STRUCTURAL DEVELOPMENT OF THE CAUDICLE OF AN ORCHID (EPIDENDRUM).
STRUCTURAL DEVELOPMENT OF THE CAUDICLE OF AN ORCHID (EPIDENDRUM).
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兰花花茎（外膜）的结构发育。
DOI：
10.1002/j.1537-2197.1983.tb12437.x
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
E. Yeung
中科院分区：
文献类型：
--
作者：
S. Blackman;E. Yeung
利用光镜和电镜观察了伊瓜附着兰（Epidendrum ibaguense，兰科）茎尾发育过程中的结构变化。尾状体起源于小孢子囊内的一团小的分生组织细胞。团体的中心细胞扩大并进入分裂周期。这个循环的完成产生线状的四分体细胞，这些细胞在尾状核的整个生命周期中保持相互连接。然后这些四分体在它们的外表面积累了一层厚厚的次级壁。这些厚壁细胞在成熟时形成尾状核的主要结构成分。肿块周围的细胞分化成一系列细胞类型，其特征是它们的光滑内质网含量很高。这些薄壁细胞大部分位于相邻茎柄之间和茎柄与花粉之间的连接点上。这些位置的细胞产生大量的脂质聚合物。该产品与存在于细胞质中离散区域的大管状内质网复合物结合合成。这些细胞的质体也产生脂质物质。一些薄壁细胞位于厚壁结构细胞之间；然而，脂质聚合物不是在这些细胞中合成的。在成熟时，所有薄壁细胞都经历分解和自溶，导致细胞质细节和细胞器逐渐消失。在含有脂质的薄壁细胞中，细胞的裂解释放出脂质团块，这些脂质团块随后在相邻的尾状细胞和尾状细胞与传粉细胞之间形成弹性连接化合物。
Structural changes during development of the caudicle of Epidendrum ibaguense (Orchidaceae) were followed using light and electron microscopy. The caudicle begins as a mass of small meristematic cells in the microsporangium. The central cells of the mass enlarge and enter a division cycle. Completion of this cycle produces linear tetrads of cells which remain attached to each other throughout the life of the caudicle. These tetrads then accumulate a thick secondary wall on their outer surfaces. These thick-walled cells form the main structural element of the caudicle at maturity. The cells on the periphery of the mass differentiate into a gradation of cell types characterized by their very high content of smooth ER. The majority of these thin-walled cells are located at the junction points between adjacent caudicles and between caudicle and pollinium. The cells in these positions produce large quantities of a lipid polymer. This product is synthesized in association with large tubular ER complexes present in discrete areas in the cytoplasm. Plastids of these cells also produce a lipidic substance. Some thin-walled cells are located among the thick-walled structural cells; however, the lipid polymer is not synthesized in these cells. At maturity, all thin-walled cells undergo breakdown and autolysis resulting in gradual obliteration of cytoplasmic detail and organelles. In the lipid containing thin-walled cells, lysis of the cells releases the lipidic masses which then form the elastic joining compound between adjacent caudicles and between caudicles and pollinia.