Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Arabidopsis ACC Oxidase 1 Coordinated by Multiple Signals Mediates Ethylene Biosynthesis and Is Involved in Root Development

  • Park, Chan Ho (Department of Life Science, Chung-Ang University) ;
  • Roh, Jeehee (Department of Life Science, Chung-Ang University) ;
  • Youn, Ji-Hyun (Department of Life Science, Chung-Ang University) ;
  • Son, Seung-Hyun (Department of Life Science, Chung-Ang University) ;
  • Park, Ji Hye (Department of Biological Science, Andong National University) ;
  • Kim, Soon Young (Department of Biological Science, Andong National University) ;
  • Kim, Tae-Wuk (Department of Life Science, College of Natural Sciences, Hanyang University) ;
  • Kim, Seong-Ki (Department of Life Science, Chung-Ang University)
  • Received : 2018.03.02
  • Accepted : 2018.08.21
  • Published : 2018.10.31
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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 tissue-specific manner. We demonstrated that point mutations in two E-box motifs on the ACO1 promoter reduce the light-regulated 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.

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References

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