Transcriptional regulation of Arabidopsis copper amine oxidase ζ (CuAOζ) in indole-3-butyric acid-induced lateral root development
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Spatiotemporal regulation of reactive oxygen species (ROS) is fine-tuned at multiple levels, including transcriptional regulation. Arabidopsis copper amine oxidase ζ (CuAOζ) is localized in peroxisomes, and the CuAOζ-derived ROS is required for indole-3-butyric acid (IBA)-induced lateral root (LR) development. Here, we showed that both GATA2 and NIGT1.2 transcription factors interacted with the 5′ untranslated region (5′ UTR) of CuAOζ, using enhanced yeast one-hybrid analysis. NIGT1.2 was highly expressed in root tips and was upregulated by IBA. Phenotypic analysis, localization, and genetic studies demonstrate that NIGT1.2 positively regulated IBA-induced CuAOζ expression, ROS generation, and LR development. Furthermore, another transcription factor, UPBEAT1 (UPB1), regulated the basal expression of CuAOζ in roots, suggesting a putative functional regulation of CuAOζ in cellular proliferation and differentiation in the root. Together, our findings indicate that transcriptional regulation of peroxisomal CuAOζ plays an important role in determining CuAOζ spatiotemporal activity and ROS homeostasis within a developing root.
KeywordsAuxin Copper amine oxidase Lateral root Peroxisome Transcription factor
We thank Philip N. Benfey (Duke University) for kindly providing upb1 and P35S:UPB1-3YFP seeds. The work was supported by grants from the Natural Science Foundation of Jiangsu Province (BK20160720) and the National Natural Science Foundation of China (31700237) and the Fundamental Research Funds for the Central Universities (Y0201700648) to Y.Q. and the National Natural Science Foundation of China (31970300) and the Fundamental Research Funds for the Central Universities (KYZ201858) to Q.Z.
YQ and QZ designed the research; XL, XZ, YT, YH, SC, LX, and QZ performed research; and YQ and QZ analyzed data and wrote the paper.
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Conflict of interest
The authors declare that they have no conflict of interest.
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