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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (3): 518-530.doi: 10.16420/j.issn.0513-353x.2020-0432

• Research Papers • Previous Articles     Next Articles

Characteristics of the Transcription Factor BrWRKY57 and Its Regulation on BrPPH1 and BrNCED3

ZENG Zexiang1, XIAO Xianmei1, TAN Xiaoli1, FAN Zhongqi2,*(), CHEN Jianye1,*()   

  1. 1Engineering Research Center of Southern Horticultural Products Preservation,Ministry of Education/Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and Vegetables,College of Horticulture,South China Agricultural University,Guangzhou 510642,China
    2Key Laboratory of Postharvest Biology for Subtropical Special Agricultural Products of Fujian Province,College of Food Science,Fujian Agriculture and Forestry University,Fuzhou 350002,China
  • Received:2020-07-17 Online:2021-03-25 Published:2021-04-02
  • Contact: FAN Zhongqi,CHEN Jianye E-mail:ffanzqi@163.com;chenjianye@scau.edu.cn

Abstract:

In this study,a WRKY transcription factor termed BrWRKY57,was obtained from Chinese flowering cabbage. Amino acid sequence alignment and phylogenetic analysis revealed that BrWRKY57 contained one WRKY conserved domain,exhibited the highest homology with Arabidopsis thalianaAtWRKY57,and belonged to sub-group IIc. Real-time quantitative PCR analysis demonstrated that BrWRKY57 was up-regulated during leaf senescence of Chinese flowering cabbage,and its expression was significantly enhanced by abscisic acid(ABA)treatment. Subcellular localization and transcriptional activity analysis suggested that BrWRKY57 was a nuclear protein and had transcriptional activation activity. Moreover,dual-luciferase transient expression assay revealed that BrWRKY57 could activate the promoter activities of chlorophyll catabolic gene BrPPH1and ABA biosynthetic gene BrNCED3. These results indicate that BrWRKY57 might be associated with Chinese flowering cabbage leaf senescence via effecting the genes expression of chlorophyll degradation and ABA synthesis.

Key words: Chinese flowering cabbage, leaf senescence, abscisic acid, WRKY transcription factor, transcriptional regulation

CLC Number: