Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (5): 104-118.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0983

   

Genome-wide Identification of U-box E3 Ubiquitin Ligase Gene Family in Setaria italica and Response Analysis to Abiotic Stress

HE Wei1,2(), LI Jun-yi1,2, LI Xin-ni1,2, MA Xue-hua2, XING Yuan1,2, CAO Xiao-ning1,2, QIAO Zhi-ju1,2(), LIU Si-chen1,2()   

  1. 1.Center for Agricultural Genetic Resources Research, College of Agronomy, Shanxi Agricultural University, Key Laboratory of Crop Gene Resources and Germplasm Enhancement on Loess Plateau of the Ministry of Agriculture and Rural Affairs, Taiyuan 030031
    2.College of Agriculture, Shanxi Agricultural University, Taigu 030801
  • Received:2024-10-08 Online:2025-05-26 Published:2025-06-05
  • Contact: QIAO Zhi-ju, LIU Si-chen E-mail:hwysyyds@163.com;qiaozhijun@sxau.edu.cn;lsch@163.com

Abstract:

Objective The ubiquitin ligase U-box (plant U-box protein, PUB) gene family (SiPUB) of Setaria italica was systematically identified based on the whole genome level, which may provide theoretical support for the study of the biological function of the ubiquitin ligase U-box gene family of S. italica. Method The U-box gene family members of S. italica were identified by the whole genome of the U-box conserved Pfam sequence. The phylogenetic tree construction, subcellular localization prediction, physical and chemical properties such as relative molecular mass and isoelectric point of the predicted protein, and Scaffold localization map of the family were analyzed. The expressions of U-box gene family members in S. italica under different stress treatments were studied by real-time fluorescence quantitative PCR (RT-qPCR). Result There were 71 PUB gene family members in the genome of S. italica, which were unevenly distributed on 8 chromosomes. Phylogenetic analysis showed that SiPUB genes were distributed in subfamilies I to Ⅸ. Promoter cis-acting element analysis showed that U-box genes were related to plant growth and development, stress and hormone regulation. The results of fluorescence quantitative PCR showed that SiPUBs were differentially expressed in various parts of S. italica. The expression patterns of different domains of S. italicaU-box gene family under stress were analyzed. The expressions of genes containing U-box domain changed significantly under low temperature and drought, and the expressions of genes containing U-box+HEAT_2 domain did not change significantly under three stresses. The expressions of genes containing U-box+Pkinase and other domains increased and decreased under different stresses, indicating that each domain played different roles in plant environmental response and gene regulation. Plants responded to abiotic stress by regulating the expression of SiPUBs. Conclusion A total of 71 SiPUBs genes are identified, and the expression patterns of different subfamilies under abiotic stress are different, indicating that SiPUBs play an important regulatory role in the response of S. italica to abiotic stress. The results of this study can provide reference for the analysis of stress resistance function of SiPUBs.

Key words: Setaria italica, E3 ubiquitin ligase, U-box gene family, low temperature stress, drought stress, MeJA stress