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Reducing jasmonic acid levels causes ein2 mutants to become ethylene responsive.

Joonyup Kim1, Sara E Patterson, Brad M Binder

  • 1Department of Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37917, USA.

FEBS Letters
|December 11, 2012
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Area of Science:

  • Plant biology
  • Molecular plant science
  • Hormone signaling pathways

Background:

  • Jasmonic acid (JA) is known to interact with the ethylene signaling pathway.
  • EIN2 is a key component in ethylene signal transduction, acting downstream of ethylene receptors.
  • EIN2 is essential for mediating ethylene responses in plants.

Purpose of the Study:

  • To investigate the role of jasmonic acid in the ethylene signaling pathway.
  • To elucidate the relationship between jasmonic acid and EIN2 function.
  • To propose a model for jasmonic acid's influence on ethylene signal transduction.

Main Methods:

  • Utilizing mutant analysis (ein2 and etr1-1) to assess ethylene response.
  • Employing chemical treatments to reduce jasmonic acid levels.
  • Observing ethylene responsiveness in genetically modified and chemically treated plants.

Main Results:

  • Reducing jasmonic acid levels, through mutation or chemical means, restored ethylene responsiveness in ein2 mutants.
  • This effect was not observed in etr1-1 mutants, indicating the interaction is downstream of ethylene receptors.
  • Jasmonic acid appears to inhibit ethylene signal transduction.

Conclusions:

  • Jasmonic acid negatively regulates ethylene signal transduction downstream of ethylene receptors.
  • A model is proposed where jasmonic acid inhibits ethylene signaling, potentially via an EIN2-independent mechanism.
  • This research highlights a novel crosstalk between jasmonic acid and ethylene signaling pathways.