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Genome Biol

Title:		The chromosome-level wintersweet (Chimonanthus praecox) genome provides insights into floral scent biosynthesis and flowering in winter
Author(s):		Shang J; Tian J; Cheng H; Yan Q; Li L; Jamal A; Xu Z; Xiang L; Saski CA; Jin S; Zhao K; Liu X; Chen L;
Address:		"Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China. Novogene Bioinformatics Institute, Beijing, 100083, People's Republic of China. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China. Xinjiang Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alaer, Xinjiang, 843300, China. Department of Plant, Clemson University, Clemson, SC, 29631, USA. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China. jsx@mail.hzau.edu.cn. Xinjiang Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Tarim University, Alaer, Xinjiang, 843300, China. jsx@mail.hzau.edu.cn. Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China. zhaokaige@mail.hzau.edu.cn. Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China. liu_xiuqun@sina.com. Southwest Engineering Technology and Research Center of Landscape Architecture, State Forestry Administration, Southwest Forestry University, Kunming, Yunnan, 650224, People's Republic of China. clqhzau@126.com"
Journal Title:		Genome Biol
Year:		2020
Volume:		20200810
Issue:		1
Page Number:		200 -
DOI:		10.1186/s13059-020-02088-y
ISSN/ISBN:		1474-760X (Electronic) 1474-7596 (Print) 1474-7596 (Linking)
Abstract:		"BACKGROUND: Wintersweet (Chimonanthus praecox), an important ornamental plant, has evolved unique fragrant aroma and winter-flowering properties, which are critical for its successful sexual reproduction. However, the molecular mechanisms underlying these traits are largely unknown in this species. In addition, wintersweet is also a typical representative species of the magnoliids, where the phylogenetic position of which relative to eudicots and monocots has not been conclusively resolved. RESULTS: Here, we present a chromosome-level wintersweet genome assembly with a total size of 695.36 Mb and a draft genome assembly of Calycanthus chinensis. Phylogenetic analyses of 17 representative angiosperm genomes suggest that Magnoliids and eudicots are sister to monocots. Whole-genome duplication signatures reveal two major duplication events in the evolutionary history of the wintersweet genome, with an ancient one shared by Laurales, and a more recent one shared by the Calycantaceae. Whole-genome duplication and tandem duplication events have significant impacts on copy numbers of genes related to terpene and benzenoid/phenylpropanoid (the main floral scent volatiles) biosynthesis, which may contribute to the characteristic aroma formation. An integrative analysis combining cytology with genomic and transcriptomic data reveals biological characteristics of wintersweet, such as floral transition in spring, floral organ specification, low temperature-mediated floral bud break, early blooming in winter, and strong cold tolerance. CONCLUSIONS: These findings provide insights into the evolutionary history of wintersweet and the relationships among the Magnoliids, monocots, and eudicots; the molecular basis underlying floral scent biosynthesis; and winter flowering, and highlight the utility of multi-omics data in deciphering important ornamental traits in wintersweet"
Keywords:		"*Biological Evolution Calycanthaceae/*genetics Chromosomes, Plant Flowers/*physiology *Genome, Plant Odorants Phylogeny Phytochemicals/*biosynthesis Terpenes/metabolism Cold tolerance Floral scent Flowering Genome Hi-C Wintersweet (Chimonanthus praecox);"
Notes:		"MedlineShang, Junzhong Tian, Jingpu Cheng, Huihui Yan, Qiaomu Li, Lai Jamal, Abbas Xu, Zhongping Xiang, Lin Saski, Christopher A Jin, Shuangxia Zhao, Kaige Liu, Xiuqun Chen, Longqing eng Comparative Study Research Support, Non-U.S. Gov't England 2020/08/12 Genome Biol. 2020 Aug 10; 21(1):200. doi: 10.1186/s13059-020-02088-y"