Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (5): 233-242.doi: 10.13560/j.cnki.biotech.bull.1985.2022-1241

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Identification and Expression Analysis of miRNA Related to Bacterial Wilt Resistance in Tomato

SHI Jian-lei1,2(), ZAI Wen-shan1, SU Shi-wen1, FU Cun-nian1, XIONG Zi-li1()   

  1. 1. Southern Zhejiang Key Laboratory of Crop Breeding, Wenzhou Vocational College of Science and Technology, Wenzhou 325006
    2. College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou 350002
  • Received:2022-10-09 Online:2023-05-26 Published:2023-06-08
  • Contact: XIONG Zi-li E-mail:sjlhebau@163.com;273493129@qq.com

Abstract:

To elucidate the regulatory relationship of miRNA-targets in the bacterial wilt response of tomato(Solanum lycopersicum), sRNA sequencing was performed in resistant and susceptible tomato inbred lines with Ralstonia solanacearum vs mock inoculation. In all, 112.76 M high-quality reads were generated in eight libraries. A total of 336 miRNA including 193 novel miRNAs were identified. Among them, 31 differentially expressed miRNAs targeted the regulatory expressions of 575 genes. In total, 556 target genes were annotated in metabolic pathways such as defense response, plant-pathogen interaction, and plant hormone signal transduction. In addition to typical TATA-box and CAAT-box with the transcriptional initiation role, as well as W-box and TC-rich repeats related to biotic stress, there were also hormone, light, abiotic stress, wound and other response elements in the promoters. RT-qPCR confirmed that six pairs of miRNA-targets had three bacterial wilt response patterns in tomato, i.e., positive-negative, negative-positive and negative-negative. These results preliminarily revealed the miRNAs may respond to the bacterial wilt disease by target gene expression in tomato.

Key words: tomato, Ralstonia solanacearum, miRNA, target gene, expression regulation