A telomere-to-telomere gap-free reference genome of Chionanthus retusus provides insights into the molecular mechanism underlying petal shape changes
文献类型： 外文期刊
作者： Wang, Jinnan 1 ; Xu, Dong 2 ; Sang, Ya Lin 1 ; Sun, Maotong 1 ; Liu, Cuishuang 1 ; Niu, Muge 1 ; Li, Ying 1 ; Liu, Laishuo 1 ; Han, Xiaojiao 4 ; Li, Jihong 1 ;
作者机构： 1.Shandong Agr Univ, Coll Forestry, Key Lab Forest Cultivat Lower Yellow River, Shandong Mt Tai Forest Ecosyst Natl Stn,Natl Fores, Tai An 271018, Peoples R China
2.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 570100, Hainan, Peoples R China
3.Chinese Acad Forestry, Minist Agr & Rural Affairs, Shenzhen Branch, Genome Anal Lab,Guangdong Lab Lingnan Modern Agr, Hangzhou 311400, Zhejiang, Peoples R China
4.Chinese Acad Forestry, Res Inst Subtrop Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding Zhejiang Prov, Hangzhou 311400, Zhejiang, Peoples R China
期刊名称：HORTICULTURE RESEARCH （ 影响因子：8.5； 五年影响因子：9.1 ）
ISSN： 2662-6810
年卷期： 2024 年 11 卷 12 期
页码：
收录情况： SCI
摘要： Chionanthus retusus, an arbor tree of the Oleaceae family, is an ecologically and economically valuable ornamental plant for its remarkable adaptability in landscaping. During C. retusus breeding, we observed diverse floral shapes; however, no available genome for C. retusus has hindered the widespread identification of genes related to flower morphology. Thus, a de novo telomere-to-telomere (T2T) gap-free genome was generated. The assembly, incorporating high-coverage and long-read sequencing data, successfully yielded two complete haplotypes (687 and 683 Mb). The genome encompasses 42 864 predicted protein-coding genes, with all 46 telomeres and 23 centromeres in one haplotype. Whole-genome duplication analysis revealed that C. retusus underwent one fewer event of whole-genome duplication after differentiation compared to other species in the Oleaceae family. Furthermore, flower vein diversity was the main reason for the differences in floral shapes. Auxin-related genes were responsible for petal shape formation on genome-based transcriptome analysis. Specifically, the removal and retention of the first intron in CrAUX/IAA20 resulted in the production of two transcripts, and the differences in the expression levels of CrAUX/IAA20 resulted in the variations of flower veins. Compared to transcripts lacking the first intron, transcripts with intron retention caused more severe decreases in the number and length of flower veins in transgenic Arabidopsis thaliana. Our findings will deepen our understanding of flower morphology development and provide important theoretical support for the cultivation of Oleaceae.
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