数字农科院2.0

Haplotype-resolved chromosome-level genome of hexaploid Jerusalem artichoke provides insights into its origin, evolution, and inulin metabolism

文献类型： 外文期刊

作者： Wang, Sen;Wang, Anqi;Chen, Rong;Xu, Dong;Wang, Hengchao;Jiang, Fan;Liu, Hangwei;Qian, Wanqiang;Fan, Wei

作者机构：

关键词： （1-1-1）Helianthus tuberosus;hexaploid genome;hybridization origin;chromosome rearrangement;inulin metabolism genes

期刊名称： PLANT COMMUNICATIONS

ISSN： 2590-3462

年卷期： 2024 年 5 卷 3 期

页码：

收录情况： SCIE（2024版） ; ; CSCD（2023-2024年度）

摘要： Jerusalem artichoke ( Helianthus tuberosus ) is a global multifunctional crop. It has wide applications in the food, health, feed, and biofuel industries and in ecological protection; it also serves as a germplasm pool for breeding of the global oil crop common sunflower ( Helianthus annuus ). However, biological studies of Jerusalem artichoke have been hindered by a lack of genome sequences, and its high polyploidy and large genome size have posed challenges to genome assembly. Here, we report a 21-Gb chromosome-level assembly of the hexaploid Jerusalem artichoke genome, which comprises 17 homologous groups, each with 6 pseudochromosomes. We found multiple large-scale chromosome rearrangements between Jerusalem artichoke and common sunflower, and our results show that the hexaploid genome of Jerusalem artichoke was formed by a hybridization event between a tetraploid and a diploid Helianthus species, followed by chromosome doubling of the hybrid, which occurred approximately 2 million years ago. Moreover, we identified more copies of actively expressed genes involved in inulin metabolism and showed that these genes may still be undergoing loss of function or sub- or neofunctionalization. These genomic resources will promote further biological studies, breeding improvement, and industrial utilization of Helianthus crops.

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