Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (10): 231-245.doi: 10.13560/j.cnki.biotech.bull.1985.2023-0315

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Transcriptome Analysis of Rhizome Development in Chrysanthemum× × morifolium

XU Jun1(), YE Yu-qing1, NIU Ya-jing2, HUANG He1(), ZHANG Meng-meng2()   

  1. 1. School of Landscape Architecture, Beijing Forestry University, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, Beijing Laboratory of Urban and Rural Ecological Environment, Beijing 100083
    2. Beijing Botanical Garden, Beijing Floriculture Engineering Technology Research Centre, Beijing 100093
  • Received:2023-04-08 Online:2023-10-26 Published:2023-11-28
  • Contact: HUANG He, ZHANG Meng-meng E-mail:1405549321@qq.com;101navy@163.com;mengmengzhang818@sina.com

Abstract:

In order to explore the molecular mechanism of chrysanthemum rhizome formation, we performed transcriptome analysis of eight tissues(RH: rhizome apical; RT: middle of rhizome; RB: bottle of rhizome; SA: shoot apical; L: leaf; S: shoot; R: root; F: ray floret)of chrysanthemum. Approximately 159.51 gigabase(GB)paired-end clean reads were obtained and assembled into 100 235 Unigenes. Among these Unigenes, 64 956(64.80%)were annotated in seven public protein databases. In order to find the key genes of rhizome development, the highly expressed genes in the rhizome tip and rhizome were screened by weighted correlation network analysis(WGCNA), K-means and screening differential genes based on Venn. Finally, a total of 20 highly expressed genes in the rhizome tip and 36 highly expressed genes in the rhizome were obtained. These genes include a large number of genes related to plant abiotic stress, the ABA metabolic gene. In addition, the phytochrome gene PHYB, the UV-B photoreception gene UVR8, and the photoperiod core transcription factors were also uncovered, six differentially expressed genes were selected for RT-qPCR analysis, and the results were consistent with RNA-seq data, verifying the validity of RNA-seq data. And these differentially expressed genes were also expressed differentially in the rhizomes of chrysanthemum strain‘2005042’.Taken above together, the formation and development of chrysanthemum rhizomes may be affected by plant hormones including abscisic acid and photoperiod. This study provides important clues to further explore the molecular mechanism of the development of chrysanthemum rhizomes.

Key words: rhizome, transcriptome, endogenous hormones