Arabidopsis thaliana GH3.9 in auxin and jasmonate cross talk

Sadaf Khan, Julie M. Stone

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Plant growth and development are governed by an intricate web of signaling networks controlled by phytohormones, such as auxin and jasmonic acid. Auxin influences all aspects of plant growth and development, ranging from embryogenesis to root and shoot morphogenesis and organ patterning. Three major groups of auxin-responsive genes have been classified as IAA/AUX, GH3 and SAUR families. Some Group I and II GH3 proteins biochemically function in conjugating amino acids to methyl jasmonate and auxin, respectively. We recently demonstrated that GH3.9, a previously uncharacterized Group II GH3 gene family member, influences primary root growth. Whereas several GH3 family members are transcriptionally induced by auxin, GH3.9 was repressed by exogenous indole-3-acetic acid (IAA) in whole seedlings. GH3.9 promoter::GUS reporter transgenic seedlings showed expression in several tissues, and application of exogenous IAA led to a shift in promoter activity from primary roots to lateral root tips, supporting the hypothesis that GH3.9 maintains auxin homeostasis by redistribution of active auxin pools in roots. GH3.9 mutations influenced both IAA- and methyl jasmonate (MeJA)-mediated root growth inhibition. In this addendum, we expand on a possible role for GH3.9 in crosstalk between auxin and jasmonate signal transduction pathways controlling plant development.

Original languageEnglish (US)
Pages (from-to)483-485
Number of pages3
JournalPlant Signaling and Behavior
Volume2
Issue number6
DOIs
StatePublished - Jan 1 2007

Fingerprint

auxins
Arabidopsis thaliana
indole acetic acid
plant development
methyl jasmonate
root growth
growth and development
promoter regions
plant growth
seedlings
jasmonic acid
root tips
plant hormones
growth retardation
morphogenesis
signal transduction
homeostasis
embryogenesis
genes
genetically modified organisms

Keywords

  • Amino acid conjugation
  • Arabidopsis thaliana
  • Auxin
  • Methyl jasmonate
  • Roots
  • Trichomes

ASJC Scopus subject areas

  • Plant Science

Cite this

Arabidopsis thaliana GH3.9 in auxin and jasmonate cross talk. / Khan, Sadaf; Stone, Julie M.

In: Plant Signaling and Behavior, Vol. 2, No. 6, 01.01.2007, p. 483-485.

Research output: Contribution to journalArticle

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