Leaf evolution in early-diverging ferns: insights from a new fern-like plant from the Late Devonian of China

doi:10.1093/aob/mcv049

	Leaf evolution in early-diverging ferns: insights from a new fern-like plant from the Late Devonian of China
	Wang, De-Ming ; Xu, Hong-He ; Xue, Jin-Zhuang ; Wang, Qi 2; Liu, Le
	2015
发表期刊	ANNALS OF BOTANY
ISSN	0305-7364
卷号	115 期号:7 页码:1133-1148
摘要	Background and Aims With the exception of angiosperms, the main euphyllophyte lineages (i. e. ferns sensu lato, progymnosperms and gymnosperms) had evolved laminate leaves by the Late Devonian. The evolution of laminate leaves, however, remains unclear for early-diverging ferns, largely represented by fern-like plants. This study presents a novel fern-like taxon with pinnules, which provides new insights into the early evolution of laminate leaves in early-diverging ferns. Methods Macrofossil specimens were collected from the Upper Devonian (Famennian) Wutong Formation of Anhui and Jiangsu Provinces, South China. A standard degagement technique was employed to uncover compressed plant portions within the rock matrix. Key Results A new fern-like taxon, Shougangia bella gen. et sp. nov., is described and represents an earlydiverging fern with highly derived features. It has a partially creeping stem with adventitious roots only on one side, upright primary and secondary branches arranged in helices, tertiary branches borne alternately or (sub) oppositely, laminate and usually lobed leaves with divergent veins, and complex fertile organs terminating tertiary branches and possessing multiple divisions and numerous terminal sporangia. Conclusions Shougangia bella provides unequivocal fossil evidence for laminate leaves in early-diverging ferns. It suggests that fern-like plants, along with other euphyllophyte lineages, had independently evolved megaphylls by the Late Devonian, possibly in response to a significant decline in atmospheric CO2 concentration. Among fern-like plants, planate ultimate appendages are homologous with laminate pinnules, and in the evolution of megaphylls, fertile organs tend to become complex.
关键词	Adventitious root atmospheric CO2 euphyllophytes fern-like plants ferns sensu lato fertile organ growth habit Late Devonian leaf evolution monilophyte Shougangia bella stem Wutong Formation
学科领域	Plant Sciences
DOI	10.1093/aob/mcv049
收录类别	SCI
语种	英语
WOS关键词	SP-NOV ; SEED PLANT ; GEN ; CLADOXYLOPSIDA ; LEAVES ; FOSSIL ; IRIDOPTERIDALES ; ORIGINS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000355625300007
出版者	OXFORD UNIV PRESS
文献子类	Article
出版地	OXFORD
EISSN	1095-8290
资助机构	Ministry of Science and Technology of China [2012CB821900] ; National Natural Science Foundation of China [41172007, 41272001]
作者邮箱	dmwang@pku.edu.cn ; hhxu@nigpas.ac.cn
作品OA属性	Green Published, Bronze
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/25586
专题	系统与进化植物学国家重点实验室
作者单位	1.Peking Univ, Dept Geol, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Wang, De-Ming,Xu, Hong-He,Xue, Jin-Zhuang,et al. Leaf evolution in early-diverging ferns: insights from a new fern-like plant from the Late Devonian of China[J]. ANNALS OF BOTANY,2015,115(7):1133-1148.
APA	Wang, De-Ming,Xu, Hong-He,Xue, Jin-Zhuang,Wang, Qi,&Liu, Le.(2015).Leaf evolution in early-diverging ferns: insights from a new fern-like plant from the Late Devonian of China.ANNALS OF BOTANY,115(7),1133-1148.
MLA	Wang, De-Ming,et al."Leaf evolution in early-diverging ferns: insights from a new fern-like plant from the Late Devonian of China".ANNALS OF BOTANY 115.7(2015):1133-1148.

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