干旱区生态环境知识资源中心(Arid): Chromosome-level genome assembly of Welwitschia mirabilis, a unique Namib Desert species

Arid

DOI	10.1111/1755-0998.13475
	Chromosome-level genome assembly of Welwitschia mirabilis, a unique Namib Desert species
	Han, Yuwei; Zhang, Weixiong; Zhou, Botong; Zeng, Peng; Tian, Zunzhe; Cai, Jing
通讯作者	Cai, J (corresponding author), Northwestern Polytech Univ, Sch Ecol & Environm, Xian, Peoples R China.
来源期刊	MOLECULAR ECOLOGY RESOURCES
ISSN	1755-098X
EISSN	1755-0998
出版年	2021-08
英文摘要	Welwitschia mirabilis, which is endemic to the Namib Desert, is the only living species within the family Welwitschiaceae. This species has an extremely long lifespan of up to 2,000 years and bears a single pair of opposite leaves that persist whilst alive. However, the underlying genetic mechanisms and evolution of the species remain poorly elucidated. Here, we report on a chromosome-level genome assembly for W. mirabilis, with a 6.30-Gb genome sequence and contig N50 of 27.50 Mb. In total, 39,019 protein-coding genes were predicted from the genome. Two brassinosteroid-related genes (BRI1 and CYCD3), key regulators of cell division and elongation, were strongly selected in W. mirabilis and may contribute to their long ever-growing leaves. Furthermore, 29 gene families in the mitogen-activated protein kinase signalling pathway showed significant expansion, which may contribute to the desert adaptations of the plant. Three positively selected genes (EHMT1, EIF4E, SOD2) may be involved in the mechanisms leading to long lifespan. Based on molecular clock dating and fossil calibrations, the divergence time of W. mirabilis and Gnetum montanum was estimated at similar to 123.5 million years ago. Reconstruction of population dynamics from genome data coincided well with the aridification of the Namib Desert. The genome sequence detailed in the current study provides insight into the evolution of W. mirabilis and should be an important resource for further study on gnetophyte and gymnosperm evolution.
英文关键词	chromosome-level genome assembly gene family genome evolution positively selected genes Welwitschia mirabilis whole-genome sequencing
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000680504300001
WOS关键词	STOMATAL DEVELOPMENT ; ORGAN SIZE ; PLANT ; SEQUENCE ; PROGRAM ; GENE ; RECONSTRUCTION ; RESISTANCE ; PREDICTION ; EVOLUTION
WOS类目	Biochemistry & Molecular Biology ; Ecology ; Evolutionary Biology
WOS研究方向	Biochemistry & Molecular Biology ; Environmental Sciences & Ecology ; Evolutionary Biology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364191
作者单位	[Han, Yuwei; Zhou, Botong; Tian, Zunzhe; Cai, Jing] Northwestern Polytech Univ, Sch Ecol & Environm, Xian, Peoples R China; [Zhang, Weixiong; Zeng, Peng] Univ Macau, Inst Chinese Med Sci, State Key Lab Qual Res Chinese Med, Macau, Peoples R China
推荐引用方式 GB/T 7714	Han, Yuwei,Zhang, Weixiong,Zhou, Botong,et al. Chromosome-level genome assembly of Welwitschia mirabilis, a unique Namib Desert species[J],2021.
APA	Han, Yuwei,Zhang, Weixiong,Zhou, Botong,Zeng, Peng,Tian, Zunzhe,&Cai, Jing.(2021).Chromosome-level genome assembly of Welwitschia mirabilis, a unique Namib Desert species.MOLECULAR ECOLOGY RESOURCES.
MLA	Han, Yuwei,et al."Chromosome-level genome assembly of Welwitschia mirabilis, a unique Namib Desert species".MOLECULAR ECOLOGY RESOURCES (2021).