High-quality reference genome sequences of two coconut cultivars provide insights into evolution of monocot chromosomes and differentiation of fiber content and plant height
文献类型： 外文期刊
作者： Wang, Shouchuang 1 ; Xiao, Yong 1 ; Zhou, Zhi-Wei 5 ; Yuan, Jiaqing 7 ; Guo, Hao 2 ; Yang, Zhuang 2 ; Yang, Jun 2 ; Sun, 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Coconut Res Inst, Hainan Key Lab Trop Oil Crops Biol, Wenchang, Peoples R China
2.Hainan Univ, Coll Trop Crops, Haikou 570228, Hainan, Peoples R China
3.Hainan Univ, Hainan Yazhou Bay Seed Lab, Sanya Nanfan Res Inst, Sanya 572025, Peoples R China
4.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya, Peoples R China
5.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China
6.Guangxi Univ, Coll Life Sci & Technol, State Key Lab Conservat & Utilizat Subtrop Agrobi, Nanning 530004, Peoples R China
7.Shaanxi Normal Univ, Coll Life Sci, Xian 710119, Peoples R China
8.North China Univ Sci & Technol, Ctr Genom & Computat Biol, Tangshan, Peoples R China
9.Max Planck Inst Mol Plant Physiol, D-14476 Potsdam, Germany
期刊名称：GENOME BIOLOGY （ 影响因子：13.583； 五年影响因子：17.433 ）
ISSN： 1474-760X
年卷期： 2021 年 22 卷 1 期
页码：
收录情况： SCI
摘要： Background Coconut is an important tropical oil and fruit crop whose evolutionary position renders it a fantastic species for the investigation of the evolution of monocot chromosomes and the subsequent differentiation of ancient plants. Results Here, we report the assembly and annotation of reference-grade genomes of Cn. tall and Cn. dwarf, whose genome sizes are 2.40 Gb and 2.39 Gb, respectively. The comparative analysis reveals that the two coconut subspecies diverge about 2-8 Mya while the conserved Arecaceae-specific whole-genome duplication (omega WGD) occurs approximately 47-53 Mya. It additionally allows us to reconstruct the ancestral karyotypes of the ten ancient monocot chromosomes and the evolutionary trajectories of the 16 modern coconut chromosomes. Fiber synthesis genes in Cn. tall, related to lignin and cellulose synthesis, are found at a higher copy number and expression level than dwarf coconuts. Integrated multi-omics analysis reveals that the difference in coconut plant height is the result of altered gibberellin metabolism, with both the GA20ox copy number and a single-nucleotide change in the promoter together leading to the difference in plant height between Cn. tall and Cn. dwarf. Conclusion We provide high-quality coconut genomes and reveal the genetic basis of trait differences between two coconuts through multi-omics analysis. We also reveal that the selection of plant height has been targeted for the same gene for millions of years, not only in natural selection of ancient plant as illustrated in coconut, but also for artificial selection in cultivated crops such as rice and maize.
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