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Additional evidence against jasmonate-induced jasmonate induction hypothesis.

Sandra S Scholz¹, Michael Reichelt², Wilhelm Boland¹

¹Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, D-07745 Jena, Germany.

Plant Science : an International Journal of Experimental Plant Biology

|September 24, 2015

Summary

Plant hormones called jasmonates regulate development and stress. While jasmonate biosynthesis genes are induced by jasmonates, this study found no actual jasmonate accumulation, suggesting post-translational regulation.

Keywords:

Coronalon JA-Ile Jasmonate responsive genes Jasmonates Wounding

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Area of Science:

Plant Biology
Molecular Biology
Biochemistry

Background:

Jasmonates are crucial plant hormones regulating development and stress responses.
Jasmonic acid is a prominent jasmonate, but (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile) is the bioactive form.
The biosynthesis pathway, enzymes, and genes for jasmonates are well-characterized and known to be jasmonate-inducible.

Purpose of the Study:

To investigate the widely accepted hypothesis of jasmonate-induced jasmonate biosynthesis.
To determine if jasmonate signaling leads to actual jasmonate accumulation.
To explore potential post-translational regulation mechanisms in jasmonate biosynthesis.

Main Methods:

Utilized coronalon, a synthetic JA-Ile mimic, on intact and wounded Arabidopsis leaves.
Coronalon application excluded cross-contamination with endogenous jasmonates.
Quantified endogenous jasmonic acid, JA-Ile, and their hydroxylated metabolites.

Main Results:

Coronalon effectively induced jasmonate-responsive genes at tested concentrations.
No accumulation of endogenous jasmonic acid, JA-Ile, or their metabolites was detected.
Despite induced gene expression, actual jasmonate biosynthesis and accumulation did not occur.

Conclusions:

The hypothesis of jasmonate-induced jasmonate biosynthesis is not supported by direct evidence of accumulation.
Jasmonate signaling may not directly trigger de novo synthesis and accumulation of jasmonates.
Findings suggest a significant role for post-translational regulation in controlling active jasmonate levels.