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Characterization of repetitive sequences in Dendrobium officinale and comparative chromosomal structures in Dendrobium species using FISH

文献类型： 外文期刊

作者： Wang, Yunzhu 1 ; Chen, Yue 1 ; Wei, Qingzhen 2 ; Chen, Xiaoyang 3 ; Wan, Hongjian 2 ; Sun, Chongbo 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Hort Res, Hangzhou 310021, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Vegetable Res, Hangzhou 310021, Peoples R China

3.Seed Management Terminal Zhejiang, Hangzhou 310021, Peoples R China

关键词： Dendrobium; Repetitive DNAs; Chromosome structure; Fluorescence in situ hybridization (FISH); Evolution

期刊名称：GENE （ 影响因子：3.913； 五年影响因子：3.48 ）

ISSN： 0378-1119

年卷期： 2022 年 846 卷

页码：

收录情况： SCI

摘要： Tandem repeats are one of the most conserved features in the eukaryote genomes. Dendrobium is the third largest genus in family Orchidaceae compromising over 1,200 species. However, the organization of repetitive se-quences in Dendrobium species remains unclear. In this study, we performed the identification and character-ization of the tandem repeats in D. officinale genome using graph-based clustering and Fluorescence in situ hybridization (FISH). Six major clusters including five satellite DNAs (DofSat1-5) and one 5S rDNA repeat (Dof5S) were identified as tandem repeats. The tandem organization of DofSat5 was verified by PCR amplifi-cation and southern blotting. The chromosomal locations of the repetitive DNAs in D. officinale were investigated by FISH using the tandem repeats and oligos probes. The results showed that each of the DofSat5, 5S and 45S rDNA had one pair of strong signals on D. officinale chromosomes. The distribution of repetitive DNAs along chromosomes was also investigated based on genomic in situ hybridization (GISH) among four Dendrobium species. The results suggested complex chromosomal fusion/segmentation and rearrangements during the evo-lution of Dendrobium species. In conclusion, the present study provides new landmarks for unequival differen-tiation of the Dendrobium chromosomes and facilitate the understanding the chromosome evolution in Dendrobium speceis.

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