MYB34, MYB51, and MYB122 distinctly regulate indolic glucosinolate biosynthesis in Arabidopsis thaliana

Mol Plant. 2014 May;7(5):814-28. doi: 10.1093/mp/ssu004. Epub 2014 Jan 15.


The MYB34, MYB51, and MYB122 transcription factors are known to regulate indolic glucosinolate (IG) biosynthesis in Arabidopsis thaliana. To determine the distinct regulatory potential of MYB34, MYB51, and MYB122, the accumulation of IGs in different parts of plants and upon treatment with plant hormones were analyzed in A. thaliana seedlings. It was shown that MYB34, MYB51, and MYB122 act together to control the biosynthesis of I3M in shoots and roots, with MYB34 controlling biosynthesis of IGs mainly in the roots, MYB51 regulating biosynthesis in shoots, and MYB122 having an accessory role in the biosynthesis of IGs. Analysis of glucosinolate levels in seedlings of myb34, myb51, myb122, myb34 myb51 double, and myb34 myb51 myb122 triple knockout mutants grown in the presence of abscisic acid (ABA), salicylic acid (SA), jasmonate (JA), or ethylene (ET) revealed that: (1) MYB51 is the central regulator of IG synthesis upon SA and ET signaling, (2) MYB34 is the key regulator upon ABA and JA signaling, and (3) MYB122 plays only a minor role in JA/ET-induced glucosinolate biosynthesis. The myb34 myb51 myb122 triple mutant is devoid of IGs, indicating that these three MYB factors are indispensable for IG production under standard growth conditions.

Keywords: R2R3 MYB; indolic glucosinolates; regulation; the triple myb34 myb51 myb122 mutant..

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / pharmacology
  • Arabidopsis / drug effects
  • Arabidopsis / genetics
  • Arabidopsis / metabolism*
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Cyclopentanes / pharmacology
  • Ethylenes / pharmacology
  • Glucosinolates / biosynthesis*
  • Mutation
  • Oxylipins / pharmacology
  • Plant Roots / drug effects
  • Plant Roots / genetics
  • Plant Roots / metabolism
  • Plant Shoots / drug effects
  • Plant Shoots / genetics
  • Plant Shoots / metabolism
  • Salicylic Acid / pharmacology
  • Transcription Factors / genetics
  • Transcription Factors / metabolism*


  • Arabidopsis Proteins
  • Cyclopentanes
  • Ethylenes
  • Glucosinolates
  • MYB122 protein, Arabidopsis
  • MYB34 protein, Arabidopsis
  • MYB51 protein, Arabidopsis
  • Oxylipins
  • Transcription Factors
  • jasmonic acid
  • Abscisic Acid
  • ethylene
  • Salicylic Acid