Mol. Cells 2018; 41(10): 881  https://doi.org/10.14348/molcells.2018.0092
Arabidopsis ACC Oxidase 1 Coordinated by Multiple Signals Mediates Ethylene Biosynthesis and Is Involved in Root Development
Chan Ho Park1,2,6, Jeehee Roh1,6, Ji-Hyun Youn1, Seung-Hyun Son1, Ji Hye Park3, Soon Young Kim3,
Tae-Wuk Kim4,5,* and Seong-Ki Kim1,*
1Department of Life Science, Chung-Ang University, Seoul 06974, Korea, 2Department of Plant Biology, Carnegie Institution for
Science, Stanford, California 94305-4150, USA, 3Department of Biological Science, Andong National University, Andong 36729,
Korea, 4Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Korea, 5Research Institute
for Natural Sciences, Hanyang University, Seoul 04763, Korea, 6These authors contributed equally to this work.
*Correspondence: twgibio@hanyang.ac.kr (TWK); skkimbio@cau.ac.kr (SKK)
Received March 2, 2018; Revised June 14, 2018; Accepted August 21, 2018.; Published online October 10, 2018.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit (http://creativecommons.org/licenses/by-nc-sa/3.0/).
ABSTRACT
Ethylene regulates numerous aspects of plant growth and development. Multiple external and internal factors coordinate ethylene production in plant tissues. Transcriptional and post-translational regulations of ACC synthases (ACSs), which are key enzymes mediating a rate-limiting step in ethylene biosynthesis have been well characterized. However, the regulation and physiological roles of ACC oxidases (ACOs) that catalyze the final step of ethylene biosynthesis are largely unknown in Arabidopsis. Here, we show that Arabidopsis ACO1 exhibits a tissue-specific expression pattern that is regulated by multiple signals, and plays roles in the lateral root development in Arabidopsis. Histochemical analysis of the ACO1 promoter indicated that ACO1 expression was largely modulated by light and plant hormones in a tissuespecific manner. We demonstrated that point mutations in two E-box motifs on the ACO1 promoter reduce the lightregulated expression patterns of ACO1. The aco1-1 mutant showed reduced ethylene production in root tips compared to wild-type. In addition, aco1-1 displayed altered lateral root formation. Our results suggest that Arabidopsis ACO1 integrates various signals into the ethylene biosynthesis that is required for ACO1’s intrinsic roles in root physiology.
Keywords: ACC oxidase 1, Arabidopsis thaliana, ethylene biosynthesis, lateral root, transcriptional regulation


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