Calcified coccoid from Cambrian Miaolingian: Revealing the potential cellular structure of Epiphyton

doi:10.1371/journal.pone.0213695

	Calcified coccoid from Cambrian Miaolingian: Revealing the potential cellular structure of Epiphyton
	Zhang, Xiyang 1,2,3; Dai, Mingyue 1; Wang, Min 1; Qi, Yong'an 1
刊名	PLOS ONE
	2019-03-14
卷号	14 期号:3 页码:18
ISSN号	1932-6203
DOI	10.1371/journal.pone.0213695
英文摘要	Epiphyton, Renalcis, and Girvanella are ubiquitous genera of calcified cyanobacteria/algae from Early Paleozoic shallow-marine limestones. One genus, Epiphyton, is characterized by a particular dendritic outline, and extensive research has revealed the morphology of calcified remains although little information on cellular structure is known. The mass occurrence of calcified Epiphyton in microbialites from Cambrian Miaolingian, the Mianchi area of North China is preserved as black clots within thrombolites and have dendritic and spherical outlines when viewed with a petrographic microscope. These remains, visible under scanning electron microscope (SEM), also comprise spherical or rectangle capsules. These capsules are made up from external envelopes and internal calcite with numerous pits, which closely resemble modern benthic coccoid cyanobacteria. These pits are between 2 mu m and 4 mu m in diameter and are interpreted here to represent the remnants of degraded coccoid cells, while the calcite that surrounds these pits is interpreted as calcified thin extracellular polymeric substances (EPS). In contrast, associated capsular envelopes represent thick EPS mineralized by calcium carbonate with an admixture of Al-Mg-Fe silicates. Dendritic ` thalli' are typically stacked apically because of the repeated growth and calcification of these capsules. Carbon and oxygen isotope results are interpreted to indicate that both photosynthesis and heterotrophic bacterial metabolism (especially sulfate reducing bacteria) contributed to carbonate precipitation by elevated alkalinity. Epiphyton are therefore here interpreted as colonies of calcified coccoid cyanobacteria, and the carbonate-oversaturated seawater during the Cambrian was conducive to their mineralization.
资助项目	National Natural Science Foundation of China[41872111]
WOS关键词	CARBONATE PRECIPITATION ; CALCIUM-CARBONATE ; NORTH CHINA ; ALGAL MATS ; CYANOBACTERIA ; RENALCIS ; BIOMINERALIZATION ; STROMATOLITES ; MICROFOSSILS ; LIMESTONES
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	PUBLIC LIBRARY SCIENCE
WOS记录号	WOS:000461166300062
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/15902]
专题	中国科学院南京地质古生物研究所
通讯作者	Qi, Yong'an
作者单位	1.Henan Polytech Univ, Sch Resources & Environm, Jiaozuo, Henan, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiyang,Dai, Mingyue,Wang, Min,et al. Calcified coccoid from Cambrian Miaolingian: Revealing the potential cellular structure of Epiphyton[J]. PLOS ONE,2019,14(3):18.
APA	Zhang, Xiyang,Dai, Mingyue,Wang, Min,&Qi, Yong'an.(2019).Calcified coccoid from Cambrian Miaolingian: Revealing the potential cellular structure of Epiphyton.PLOS ONE,14(3),18.
MLA	Zhang, Xiyang,et al."Calcified coccoid from Cambrian Miaolingian: Revealing the potential cellular structure of Epiphyton".PLOS ONE 14.3(2019):18.