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Open AccessArticle

Genome-Wide Identification of WRKY Transcription Factors in Chinese jujube (Ziziphus jujuba Mill.) and Their Involvement in Fruit Developing, Ripening, and Abiotic Stress

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Key Comprehensive Laboratory of Forest for Shaanxi Province, College of Forestry, Northwest A&F University, Yangling 712100, China
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Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, College of Plant Science, Tarim University, Alaer 843300, China
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Shaanxi Key Laboratory of Chinese Jujube, College of Life Science, Yanan University, Yanan 716000, China
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Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
*
Author to whom correspondence should be addressed.
Genes 2019, 10(5), 360; https://doi.org/10.3390/genes10050360
Received: 25 February 2019 / Revised: 29 April 2019 / Accepted: 6 May 2019 / Published: 10 May 2019
(This article belongs to the Section Plant Genetics and Genomics)
Chinese jujube (Ziziphus jujuba Mill.) is an economically important fruit crop in China and mainly cultivated on land with high salinity and drought conditions in northern China. WRKY transcription factors (TFs) are involved in plant development and in responses to multiple abiotic stresses. In this study, we identified 61 and 52 putative ZjWRKY TFs in ‘Junzao’ and ‘Dongzao’ at the genome-wide level. Tissue expression profiling showed that 7 genes were constitutively expressed at high level in all tissues of ‘Junzao’. Transcriptome analysis revealed that 39 ZjWRKY genes were expressed during ‘Junzao’ jujube fruit ripening. Among these genes, the transcript abundance of 19 genes were differentially expressed between ‘Junzao’ and ‘Qingjiansuanzao’ fruit. In addition, RT-qPCR analyses revealed that 30, 14, and 18 ZjWRKY genes responded to drought, NaCl, and ABA treatments, respectively. Taken together, ZjWRKY genes expression dynamics during jujube fruit development, ripening, and their differences between jujube and wild jujube would provide insights into their possible roles regulating fruit ripening. In addition, those ZjWRKY genes responded strongly to drought and salt stress, which provide candidate ZjWRKY genes for facilitating tolerance breeding. View Full-Text
Keywords: Ziziphus jujuba Mill.; WRKY; transcription factors; fruit ripening; drought stress; salt stress Ziziphus jujuba Mill.; WRKY; transcription factors; fruit ripening; drought stress; salt stress
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Chen, X.; Chen, R.; Wang, Y.; Wu, C.; Huang, J. Genome-Wide Identification of WRKY Transcription Factors in Chinese jujube (Ziziphus jujuba Mill.) and Their Involvement in Fruit Developing, Ripening, and Abiotic Stress. Genes 2019, 10, 360.

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