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Genome-wide analysis of the WRKY gene family and their positive responses to phytoplasma invasion in Chinese jujube.
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- Author(s): Xue, Chaoling1,2 ; Li, Hongtai1,2 ; Liu, Zhiguo3 ; Wang, Lili3 ; Zhao, Yitong1 ; Wei, Ximeng1 ; Fang, Hu4 ; Liu, Mengjun3 ; Zhao, Jin1,2
- Source:
BMC Genomics. 6/7/2019, Vol. 20 Issue 1, pN.PAG-N.PAG. 1p. 8 Diagrams, 1 Chart, 1 Graph.- Subject Terms:
- Source:
- Additional Information
- Abstract: Background: The WRKY gene family is one of the most important families in higher plants. As transcription factors, they actively respond to biotic and abiotic stress and are also involved in plant development. Chinese jujube (Ziziphus jujuba Mill.) is the largest type of dried fruit tree in China in terms of production, but its production is largely limited by phytoplasma infection, and the information about the role of WRKY genes under phytoplasma stress was still limited. Results: We identified 54 ZjWRKYs in the jujube genome and classified them into three subgroups according to conserved WRKY domains and zinc-finger structure. 41 ZjWRKYs were distributed on 11 of 12 pseudo chromosomes in Chinese jujube. The majority of ZjWRKYs were highly expressed in the seven examined tissues, indicating that they play multiple roles in these vegetative and reproductive organs. Transcriptome data showed that most of the characterised ZjWRKYs were highly expressed at later stages of fruit development. RT-qPCR demonstrated that the expression of 23 ZjWRKYs changed following phytoplasma infection, suggesting that they are involved in signalling pathways that respond to phytoplasma stress. Then, STRING analysis and yeast two-hybrid screening proved that some ZjWRKY proteins were interacting with ZjMAPKK proteins, which were also involved in phytoplasma invasion. Moreover, their differential expressions were further confirmed in resistant and susceptible jujube varieties under phytoplasma stress. These results suggest that ZjWRKYs play significant roles in phytoplasma tolerance and should be crucial candidate genes for jujube-phytoplasma interaction. Conclusions: 54 ZjWRKYs in Chinese jujube were identified and classified into three subgroups. 41 ZjWRKYs were unevenly distributed along the chromosomes. The majority of ZjWRKYs were highly expressed in various tissues. Most of the ZjWRKYs were positive responses to phytoplasma invasion, and that provided candidate genes for the future studies of jujube-phytoplasma interaction. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of BMC Genomics is the property of BioMed Central and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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