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Related Experiment Video

Updated: Jul 24, 2025

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
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FERONIA, the kinase that phosphorylates PhyB.

Shambhavi Sharma1, Manoj Prasad2

  • 1National Institute of Plant Genome Research, New Delhi, India.

Trends in Plant Science
|July 5, 2023
PubMed
Summary

Researchers identified the specific kinase that phosphorylates phytochrome B (phyB), a key plant photoreceptor. This discovery reveals how phyB

Keywords:
FERONIAphosphorylationphytochrome B (phyB)salt stress

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Area of Science:

  • Plant biology
  • Molecular biology
  • Biochemistry

Background:

  • Phytochrome B (phyB) is a crucial photoreceptor involved in plant photomorphogenesis.
  • The phosphorylation of phyB is a dynamic regulatory mechanism influenced by environmental cues.
  • The specific kinase responsible for phyB phosphorylation remained unidentified until this study.

Purpose of the Study:

  • To identify the kinase that phosphorylates phyB.
  • To elucidate the biological role of phyB phosphorylation in plant stress responses, specifically salt stress.

Main Methods:

  • Utilized biochemical assays to identify the kinase.
  • Conducted genetic analyses to investigate the biological implications of phyB phosphorylation.
  • Performed experiments under salt stress conditions to observe plant responses.

Main Results:

  • Identified a specific kinase that directly phosphorylates phyB.
  • Demonstrated the critical role of this phosphorylation in regulating plant adaptation to salt stress.
  • Observed altered salt stress tolerance in plants with modified kinase activity or phyB phosphorylation status.

Conclusions:

  • The identified kinase is a key regulator of phyB activity through phosphorylation.
  • PhyB phosphorylation plays a significant role in mediating plant responses to environmental stresses like salinity.
  • This finding opens new avenues for understanding light signaling and stress adaptation in plants.