The genomes of seven economic Caesalpinioideae trees provide insights into polyploidization history and secondary metabolite biosynthesis

文献类型： 外文期刊

第一作者： Chen, Rong

作者： Chen, Rong;Chen, Rong;Meng, Sihan;Wang, Anqi;Jiang, Fan;Yuan, Lihua;Lei, Lihong;Wang, Hengchao;Fan, Wei;Yuan, Lihua;Lei, Lihong

作者机构：

关键词： Caesalpinioideae; hybridization origin; chromosome rearrangement; mimosine biosynthesis genes; triterpenoid saponins

期刊名称：PLANT COMMUNICATIONS （ 影响因子：11.6； 五年影响因子：11.8 ）

ISSN： 2590-3462

年卷期： 2024 年 5 卷 9 期

页码：

收录情况： SCI

摘要： The Caesalpinioideae subfamily contains many well-known trees that are important for economic sustain- ability and human health, but a lack of genomic resources has hindered their breeding and utilization. Here, we present chromosome-level reference genomes for the two food and industrial trees Gleditsia sinensis (921 Mb) and Biancaea sappan (872 Mb), the three shade and ornamental trees Albizia julibrissin (705 Mb), Delonix regia (580 Mb), and Acacia confusa (566 Mb), and the two pioneer and hedgerow trees Leucaena leucocephala (1338 Mb) and Mimosa bimucronata (641 Mb). Phylogenetic inference shows that the mimosoid clade has a much higher evolutionary rate than the other clades of Caesalpinioideae. Macrosynteny comparison suggests that the fusion and breakage of an unstable chromosome are responsible for the difference in basic chromosome number (13 or 14) for Caesalpinioideae. After an ancient whole-genome duplication (WGD) shared by all Caesalpinioideae species (CWGD, similar to 72.0 million years ago [MYA]), there were two recent successive WGD events, LWGD-1 (16.2-19.5 MYA) and LWGD-2 (7.1-9.5 MYA), in L. leucocephala. Thereafter, '40% gene loss and genome-size contraction have occurred during the diploidization process in L. leucocephala. To investigate secondary metabolites, we identified all gene copies involved in mimosine metabolism in these species and found that the abundance of mimosine biosynthesis genes in L. leucocephala largely explains its high mimosine production. We also identified the set of all potential genes involved in triterpenoid saponin biosynthesis in G. sinensis, which is more complete than that based on previous transcriptome-derived unigenes. Our results and genomic resources will facilitate biological studies of Caesalpinioideae and promote the utilization of valuable secondary metabolites.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序