A telomere-to-telomere gap-free reference genome of Chionanthus retusus provides insights into the molecular mechanism underlying petal shape changes.

Autor:	Wang J; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Xu D; Rubber Research Institute, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 570100, China.; Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China., Sang YL; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Sun M; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Liu C; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Niu M; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Li Y; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Liu L; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China., Han X; State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding of Zhejiang Province, Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang 311400, China., Li J; Shandong Mountain Tai Forest Ecosystem National Station, Key Laboratory of Forest Cultivation in the Lower Yellow River, National Forestry and Grassland Administration, College of Forestry, Shandong Agricultural University, Tai'an 271018, China.
Jazyk:	angličtina
Zdroj:	Horticulture research [Hortic Res] 2024 Sep 03; Vol. 11 (12), pp. uhae249. Date of Electronic Publication: 2024 Sep 03 (Print Publication: 2024).
DOI:	10.1093/hr/uhae249
Abstrakt:	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. Competing Interests: The authors declare that they have no competing interests. (© The Author(s) 2024. Published by Oxford University Press on behalf of Nanjing Agricultural University.)
Databáze:	MEDLINE
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