Trehalose-6-phosphate signaling regulates thermoresponsive hypocotyl growth in Arabidopsis thaliana

Geonhee Hwang, Sara Kim, Jae Yong Cho, Inyup Paik, Jeong Il Kim, Eunkyoo Oh

Research output: Contribution to journalArticle

Abstract

Growth plasticity is a key mechanism by which plants adapt to the ever-changing environmental conditions. Since growth is a high-energy-demanding and irreversible process, it is expected to be regulated by the integration of endogenous energy status as well as environmental conditions. Here, we show that trehalose-6-phosphate (T6P) functions as a sugar signaling molecule that coordinates thermoresponsive hypocotyl growth with endogenous sugar availability. We found that the loss of T6P SYNTHASE 1 (TPS1) in Arabidopsis thaliana impaired high-temperature-mediated hypocotyl growth. Consistently, the activity of PIF4, a transcription factor that positively regulates hypocotyl growth, was compromised in the tps1 mutant. We further show that, in the tps1 mutant, a sugar signaling kinase KIN10 directly phosphorylates and destabilizes PIF4. T6P inhibits KIN10 activity in a GRIK-dependent manner, allowing PIF4 to promote hypocotyl growth at high temperatures. Together, our results demonstrate that T6P determines thermoresponsive growth through the KIN10-PIF4 signaling module. Such regulation of PIF4 by T6P integrates the temperature-signaling pathway with the endogenous sugar status, thus optimizing plant growth response to environmental stresses.

Original languageEnglish
Article numbere47828
JournalEMBO Reports
Volume20
Issue number10
DOIs
Publication statusPublished - 2019 Oct 4

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Keywords

  • Arabidopsis
  • PIF4
  • thermomorphogenesis
  • TPS1
  • trehalose-6-phosphate

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Genetics

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