Molecular Genetics and Genomics

, 280:249 | Cite as

Impact of transcriptional, ABA-dependent, and ABA-independent pathways on wounding regulation of RNS1 expression

  • Melissa S. Hillwig
  • Nicole D. LeBrasseur
  • Pamela J. Green
  • Gustavo C. MacIntosh
Original Paper

Abstract

Injured plants induce a wide range of genes whose products are thought to help to repair the plant or to defend against opportunistic pathogens that might infect the wounded plant. In Arabidopsis thaliana L., oligogalacturonides (OGAs) and jasmonic acid (JA) are the main regulators of the signaling pathways that control the local and systemic wound response, respectively. RNS1, a secreted ribonuclease, is induced by wounding in Arabidopsis independent of these two signals, thus indicating that another wound-response signal exists. Here we show that abscisic acid (ABA), which induces wound-responsive genes in other systems, also induces RNS1. In the absence of ABA signaling, wounding induces only approximately 45% of the endogenous levels of RNS1 mRNA. However, significant levels of RNS1 still accumulate in the absence of ABA signaling. Our results suggest that wound-responsive increases in ABA production may amplify induction of RNS1 by a novel ABA-independent pathway. To elucidate this novel pathway, we show here that the wound induction of RNS1 is due in part to transcriptional regulation by wounding and ABA. We also show evidence of post-transcriptional regulation which may contribute to the high levels of RNS1 transcript accumulation in response to wounding.

Keywords

Abscisic acid Post-transcriptional regulation Promoter Ribonuclease Wounding 

Abbreviations

ABA

Abscisic acid

ABRE

ABA-responsive element

DRE

Dehydration response element

JA

Jasmonic acid

OGA

Oligogalacturonides

RNase

Ribonuclease

SA

Salicylic acid

Supplementary material

438_2008_360_MOESM1_ESM.pdf (282 kb)
Electronic supplementary material (PDF 283 kb)

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Melissa S. Hillwig
    • 1
  • Nicole D. LeBrasseur
    • 2
    • 3
  • Pamela J. Green
    • 4
  • Gustavo C. MacIntosh
    • 5
  1. 1.Interdepartmental Genetics ProgramIowa State UniversityAmesUSA
  2. 2.MSU-DOE Plant Research LaboratoryMichigan State UniversityEast LansingUSA
  3. 3.New YorkUSA
  4. 4.Delaware Biotechnology Institute and Department of Plant and Soil SciencesUniversity of DelawareNewarkUSA
  5. 5.Department of Biochemistry, Biophysics and Molecular Biology and Plant Sciences InstituteIowa State UniversityAmesUSA

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