文献类型： 外文期刊

作者： Wang, Sen ¹ ; Wang, Anqi ¹ ; Chen, Rong ¹ ; Xu, Dong ¹ ; Wang, Hengchao ¹ ; Jiang, Fan ¹ ; Liu, Hangwei ¹ ; Qian, Wanqiang ¹ ; Fan, Wei ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Guangdong Lab Lingnan Modern Agr, Genome Anal Lab, Shenzhen Branch,Agr Genom Inst Shenzhen,Minist Agr, Shenzhen 518120, Peoples R China

2.Guangdong Acad Agr Sci, Guangdong Prov Key Lab Crop Germplasm Resources Pr, Agrobiol Gene Res Ctr, Guangzhou 510640, Peoples R China

3.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China

关键词： Helianthus tuberosus; hexaploid genome; hybridization origin; chromosome rearrangement; inulin metabolism genes

期刊名称：PLANT COMMUNICATIONS （ 影响因子：10.5； 五年影响因子：10.5 ）

ISSN： 2590-3462

年卷期： 2024 年 5 卷 3 期

页码：

收录情况： SCI

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.