The Litsea genome and the evolution of the laurel family
The Litsea genome and the evolution of the laurel family
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DOI：
10.1038/s41467-020-15493-5
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发表时间：
2020-04-03
影响因子：
16.6
通讯作者：
Wang, Yang-Dong
中科院分区：
文献类型：
--
作者：
Chen, Yi-Cun;Li, Zhen;Wang, Yang-Dong
木兰科植物中的月桂科植物因其气味、多变的花序和有争议的系统发育位置而引起人们的关注。在这里，我们提出了一个染色体水平的山苍子基因组组装，连同低覆盖率的基因组和转录组数据为许多其他樟科。系统基因组学分析显示木兰科植物的系统发育不一致，表明单子叶植物，真双子叶植物和木兰科植物的分歧期间不完整的谱系排序。一个古老的全基因组重复（WGD）事件发生之前的分歧Laurales和木兰目，随后，独立的WGD几乎同时发生在三个Lauralean谱系。樟科内的系统发育关系对应于花序的分化，如由FUWA的进化所证明的，FUWA是一个保守的基因，参与决定樟科的穗构型。在樟科中负责产生特定挥发性化合物的单萜醇脱氢酶在功能上得到了验证。我们的工作揭示了樟科的进化，花的进化和特定气味的遗传基础。
The laurel family within the Magnoliids has attracted attentions owing to its scents, variable inflorescences, and controversial phylogenetic position. Here, we present a chromosome-level assembly of the Litsea cubeba genome, together with low-coverage genomic and transcriptomic data for many other Lauraceae. Phylogenomic analyses show phylogenetic discordance at the position of Magnoliids, suggesting incomplete lineage sorting during the divergence of monocots, eudicots, and Magnoliids. An ancient whole-genome duplication (WGD) event occurred just before the divergence of Laurales and Magnoliales; subsequently, independent WGDs occurred almost simultaneously in the three Lauralean lineages. The phylogenetic relationships within Lauraceae correspond to the divergence of inflorescences, as evidenced by the phylogeny of FUWA, a conserved gene involved in determining panicle architecture in Lauraceae. Monoterpene synthases responsible for production of specific volatile compounds in Lauraceae are functionally verified. Our work sheds light on the evolution of the Lauraceae, the genetic basis for floral evolution and specific scents.