Abstract
TEOSINTE BRANCHED 1/CYCLOIDEA/PROLIFERATING CELL FACTOR 1 (TCP) transcription factors control multiple aspects of growth and development in various plant species. However, few genes were reported to be directly targeted and regulated by them through their specific binding sites, and then uncover their functions in plants. A consensus DNA-binding site motif of TCP2 was identified by random binding site selection (RBSS). DNA recognized by TCP2 contained the motif G(G/T)GGNCC(A/C), which showed high consistency with motifs bound by other TCP domain proteins. Consequently, this motif was regarded as the specific DNA-binding sites of TCP2. Circadian clock associated 1 (CCA1) and EARLY FLOWERING 3 (ELF3) were subsequently considered as potential target genes owing to the containing of the similar TCP2 binding sites or core binding sites GGNCC and found to be positively regulated by TCP2 via DNA binding. Phenotype analysis results showed that mutation and over-expression of TCP2 resulted in variations in leaf morphogenesis, especially the double or triple mutations of TCP2, 4 and 10. Mutations in TCPs caused late flowering. Finally, TCP2 was shown to influence hypocotyl elongation by mediating the jasmonate signaling pathway. Overall, these results provide a basis for future studies aimed at distinguishing the target genes of TCP2 and elucidating the important roles of TCP2 in plant growth and development.
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Abbreviations
- TCP2:
-
Teosinte branched 1, cycloidea and PCF transcription factor 2
- RBSS:
-
Random binding site selection
- CCA1 :
-
Circadian clock associated 1
- ELF3 :
-
Early flowering 3
- bHLH:
-
Basic helix-loop-helix
- ECE:
-
Glutamate-cysteine-glutamate
- CYC:
-
Cycloidea
- CRY1 :
-
Cryptochrome 1
- Gly:
-
Glycine
- Asp:
-
Aspartate
- Thr:
-
Threonine
- CDT1a :
-
Homolog of yeast CDT1 A
- CDT1b :
-
Homolog of yeast CDT1 B
- PIF4 :
-
Phytochrome-interacting factor4
- ABAP1:
-
Armadillo btb protein 1
- JA:
-
Jasmonic acid
- BRC1 :
-
Branched 1
- CHE :
-
CCA1 hiking expedition
- TOC1 :
-
Timing of cab expression 1
- ChIP:
-
Chromatin immunoprecipitation
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Acknowledgements
We thank Detlef Weigel for tcp2, tcp2tcp4, and tcp2tcp4tcp10 seeds. The authors acknowledge the financial support was provided by Hunan Provincial Natural Science Foundation of China (Grant No. 2019JJ50692) and the National Natural Science Foundation of China (Grant No. 31902345).
Funding
This study was funded by grants from Hunan Provincial Natural Science Foundation of China (Grant No.2019JJ50692) and the National Natural Science Foundation of China (Grant No. 31902345).
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SL conceived the study and commented on the manuscript. ZH performed laboratory and data analyses. The first draft of the manuscript was written by ZH. XZ, JC, LY and ZZ participated in the data supplement and reviewing of the revised manuscript. JX commented on the manuscript. All authors read and approved the final manuscript.
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He, Z., Zhou, X., Chen, J. et al. Identification of a consensus DNA-binding site for the TCP domain transcription factor TCP2 and its important roles in the growth and development of Arabidopsis. Mol Biol Rep 48, 2223–2233 (2021). https://doi.org/10.1007/s11033-021-06233-z
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DOI: https://doi.org/10.1007/s11033-021-06233-z