Leaf cuticle ultrastructure of Pseudofrenelopsis dalatzensis (Chow et Tsao) Cao ex Zhou (Cheirolepidiaceae) from the Lower Cretaceous Dalazi Formation of Jilin, China
Leaf cuticle ultrastructure of Pseudofrenelopsis dalatzensis (Chow et Tsao) Cao ex Zhou (Cheirolepidiaceae) from the Lower Cretaceous Dalazi Formation of Jilin, China
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中国吉林下白垩统达拉子组 Pseudofrenelopsis dalatzensis (Chow et Tsao) Cao ex Zhou (Cheirolepidiaceae) 叶角质层超微结构
DOI：
10.1016/j.revpalbo.2008.06.002
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发表时间：
2009-01-01
影响因子：
1.9
通讯作者：
Barale, Georges
中科院分区：
文献类型：
--
作者：
Yang, Xiao-Ju;Guignard, Gaetan;Barale, Georges
下白垩统达拉子组的小球藻针叶植物Pseudofrenelopsis dalatzsis在丰富资料的基础上，对吉林省东北地区的中国进行了详细的研究。营养枝的大体形态表现出比以前所知的更大的变化。显微结构的另一个信息是，来自叶片游离部的近轴角质层与远轴角质层一样，也是乳头状的。角质层的良好保存使该家族第一次在超微结构水平上形成了四种不同类型的角质层：辅助细胞、保卫细胞、有乳突和无乳突的表皮细胞。根据30个测量值，对每种类型的细胞角质层进行了统计，即不仅角质层的总厚度，而且所有不同层的细节和比例。使用7个显著的超微结构特征的组合来提供检索表。这些结果似乎是非常有希望的每一个分类群在千金草科的身份。角质层超微结构特征为：角质层A由A1波状多层和A2颗粒层组成，角质层B上方有B1纤维层和B2颗粒层。并讨论了超微结构特征在分类学和古生态学不同层面上的重要性。(C)2008爱思唯尔B.V.保留所有权利。
The cheirolepidiaceous conifer Pseudofrenelopsis dalatzensis from the Lower Cretaceous Dalazi Formation. Jilin Province, Northeast China is studied in detail based on abundant material. The gross morphology of vegetative shoots shows a greater variation than previously known. Additional information of microstructure is that the adaxial cuticle from the free part of leaves is also papillate as the abaxial cuticle. The excellent preservation of cuticles allows for the first time in this family to four distinct types of cuticle in ultrastructural level: subsidiary cells, guard cells, epidermal cells with and without papillae. Based on 30 measurements the statistic approach on each type of cell cuticle, i.e. not only the total thickness of the cuticle but also details and proportions of all different layers. A key is provided using a combination of 7 significant ultrastructural characters. These results seem to be very promising for the identity of each taxon within the Cheirolepidiaceae family. The cuticular ultrastructure of this family is characterized by having a cuticle proper A composed of A1 wavy polylamellate layer and A2 granular layer, above the cuticular layer B with B1 fibrillate and B2 granular layers. The importance of ultrastructural characters at different levels of taxonomy and palaeoecology is also discussed. (c) 2008 Elsevier B.V. All rights reserved.