Diverse stress signals activate the C1 subgroup MAP kinases of Arabidopsis

FEBS Lett. 2007 May 1;581(9):1834-40. doi: 10.1016/j.febslet.2007.03.075. Epub 2007 Apr 9.

Abstract

Mitogen-activated protein kinase (MAPK) cascades play an important role in mediating stress responses in plants. In Arabidopsis, 20 MAPKs have been identified and classified into four major groups (A-D). Little is known about the role of group C MAPKs. We have studied the activation of Arabidopsis subgroup C1 MAPKs (AtMPK1/AtMPK2) in response to mechanical injury. An increase in their kinase activity was detected in response to wounding that was blocked by cycloheximide. Jasmonic acid (JA) activated AtMPK1/AtMPK2 in the absence of wounding. Wound and JA-induction of AtMPK1/2 kinase activity was not prevented in the JA-insensitive coi1 mutant. Other stress signals, such as abscisic acid (ABA) and hydrogen peroxide, activated AtMPK1/2. This report shows for the first time that regulation of AtMPK1/2 kinase activity in Arabidopsis might be under the control of signals involved in different kinds of stress.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / pharmacology
  • Acclimatization / genetics*
  • Arabidopsis / enzymology*
  • Arabidopsis / genetics
  • Arabidopsis Proteins / genetics*
  • Arabidopsis Proteins / metabolism
  • Gene Expression Regulation, Enzymologic / drug effects
  • Gene Expression Regulation, Plant / drug effects
  • Hydrogen Peroxide / pharmacology
  • Mitogen-Activated Protein Kinases / genetics*
  • Mitogen-Activated Protein Kinases / metabolism
  • Signal Transduction / genetics
  • Stress, Mechanical

Substances

  • Arabidopsis Proteins
  • Abscisic Acid
  • Hydrogen Peroxide
  • ATMPK1 protein, Arabidopsis
  • MPK2 protein, Arabidopsis
  • Mitogen-Activated Protein Kinases