Diverse stress signals activate the C1 subgroup MAP kinases of Arabidopsis.
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.
Ortiz-Masia
Dolores
D
Facultad de Farmacia, Universidad de Valencia, Avda. Vicente Andrés Estellés s/n, 46100 Burjassot, Spain.
Perez-Amador
Miguel A
MA
Carbonell
Juan
J
Marcote
Maria J
MJ
D000040:Abscisic Acid / Q000494:pharmacology; D000064:Acclimatization / Q000235:genetics*; D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics; D013314:Stress, Mechanical
D029681:Arabidopsis Proteins; D000040:Abscisic Acid; D006861:Hydrogen Peroxide; C086369:ATMPK1 protein, Arabidopsis; C086370:MPK2 protein, Arabidopsis; D020928:Mitogen-Activated Protein Kinases