The nature and origin of nucleus-like intracellular inclusions in   Paleoproterozoic eukaryote microfossils

doi:10.1111/gbi.12053

CORC > 北京大学 > 生命科学学院

	The nature and origin of nucleus-like intracellular inclusions in Paleoproterozoic eukaryote microfossils
	Pang, K. ; Tang, Q. ; Schiffbauer, J. D. ; Yao, J. ; Yuan, X. ; Wan, B. ; Chen, L. ; Ou, Z. ; Xiao, S.
刊名	geobiology
	2013
关键词	EXPERIMENTAL SILICIFICATION MESOPROTEROZOIC ROCKS SHANXI PROVINCE ANIMAL EMBRYOS FOSSIL RECORD RUYANG GROUP MICROORGANISMS PRESERVATION ORGANISMS CHINA
DOI	10.1111/gbi.12053
英文摘要	The well-known debate on the nature and origin of intracellular inclusions (ICIs) in silicified microfossils from the early Neoproterozoic Bitter Springs Formation has recently been revived by reports of possible fossilized nuclei in phosphatized animal embryo-like fossils from the Ediacaran Doushantuo Formation of South China. The revisitation of this discussion prompted a critical and comprehensive investigation of ICIs in some of the oldest indisputable eukaryote microfossilsthe ornamented acritarchs Dictyosphaera delicata and Shuiyousphaeridium macroreticulatum from the Paleoproterozoic Ruyang Group of North Chinausing a suite of characterization approaches: scanning electron microscopy (SEM), transmission electron microscopy (TEM), and focused ion beam scanning electron microscopy (FIB-SEM). Although the Ruyang acritarchs must have had nuclei when alive, our data suggest that their ICIs represent neither fossilized nuclei nor taphonomically condensed cytoplasm. We instead propose that these ICIs likely represent biologically contracted and consolidated eukaryotic protoplasts (the combination of the nucleus, surrounding cytoplasm, and plasma membrane). As opposed to degradational contraction of prokaryotic cells within a mucoidal sheatha model proposed to explain the Bitter Springs ICIsour model implies that protoplast condensation in the Ruyang acritarchs was an in vivo biologically programmed response to adverse conditions in preparation for encystment. While the discovery of bona fide nuclei in Paleoproterozoic acritarchs would be a substantial landmark in our understanding of eukaryote evolution, the various processes (such as degradational and biological condensation of protoplasts) capable of producing nuclei-mimicking structures require that interpretation of ICIs as fossilized nuclei be based on comprehensive investigations.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000325616400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Biology; Environmental Sciences; Geosciences, Multidisciplinary; SCI(E); 16; ARTICLE; 6; 499-510; 11
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/224338]
专题	生命科学学院
推荐引用方式 GB/T 7714	Pang, K.,Tang, Q.,Schiffbauer, J. D.,et al. The nature and origin of nucleus-like intracellular inclusions in Paleoproterozoic eukaryote microfossils[J]. geobiology,2013.
APA	Pang, K..,Tang, Q..,Schiffbauer, J. D..,Yao, J..,Yuan, X..,...&Xiao, S..(2013).The nature and origin of nucleus-like intracellular inclusions in Paleoproterozoic eukaryote microfossils.geobiology.
MLA	Pang, K.,et al."The nature and origin of nucleus-like intracellular inclusions in Paleoproterozoic eukaryote microfossils".geobiology (2013).