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Anatomy and plant affinity of Chuaria

ISSN号：1001-6538
期刊名称：科学通报(英文版)
时间：0
页码：197-202
语言：中文
分类：Q944.5[生物学—植物学] Q756[生物学—分子生物学]
作者机构：[1]State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China, [2]College of Biological Sciences, Nanjing Normal University, Nanjing 210046, China, [3]Hunan Geological Museum, Changsha 410007, China
相关基金：We thank Dr. Li Nan and SFLBG for access to the cycad specimen, Wang Chunzhao, Zhuo Erjun, and He Culling for their help in fossil processing. We thank two anonymous reviewers for their constructive suggestions. Thiswork was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences （KZCX2-YW-153,154）, the National Natural Science Foundation of China （40772006, 40625006, 40632010 and J0630967）, the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology （20102108 and 20101104）, and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
相关项目：化石植物细胞超微结构与生理活动研究

关键词：亲和力, 解剖学, 真核生物, 植物, 细胞结构, 地球化学分析, 前寒武纪, 相互排斥, Chuaria, plant, cell wall, multicellular, eukaryote, membrane

中文摘要：

Chuaria 是记录在的很少全球性分布式的 macrofossil 先驱之一前寒武纪。尽管有超过 100 年学习，它也许以它的亲密关系是最争论的石块。许多互相独占的亲密关系为这经常遇到的石块被建议了。尽管经常当作了多细胞的水藻，因为，这解释仍然保持不确定缺乏细胞的结构的不含糊的示范。在这份报纸， Chuaria 的细胞的详情清楚地第一次被披露。在 Chuaria 的房间墙建议它是多细胞的真核细胞的水藻，与最近的 biogeochemical 分析一致。细胞墙的不同厚度在这个有机体建议主要细胞的区别。在房间以内的像膜的结构(第一在前寒武纪的石块被报导) 暗示一个真核细胞的性质。这研究部分在 Chuaria 的亲密关系上解决世纪长的争吵，并且在 Neoproterozoic 冻结成冰前使 Chuaria 成为很少公认的多细胞的优核质之一。

英文摘要：

Chuaria is one of the few globally distributed macrofossil pioneers documented in the Precambrian. It is perhaps the most controversial fossil in term of its affinity despite more than one hundred years of study. Many mutually exclusive affinities have been suggested for this frequently encountered fossil. Although often treated as a multiceUular alga, this interpretation remains incon- clusive because the lacking unambiguous demonstration of cellular structures. In this paper the cellular details of Chuaria are clearly revealed for the first time. The cell walls in Chuaria suggest that it is a multicellular eukaryotic alga, in agreement with the latest biogeochemical analyses. Different thicknesses of cell walls suggest primary cellular differentiation in this organism. Mem- brane-like structures within the cells （the first to be reported in Precambrian fossils） imply a eukaryotic nature. This study partially resolves the century-long controversy over the affinity of Chuaria, and makes Chuaria one of the few recognized multieellular eukaryotes before the Neoproterozoic glaciation.