title: Mapping out the roles of MAP kinases in plant defense.
abstract: Arabidopsis contains 20 MAP kinase genes, but their roles in plant physiology have remained largely unknown because of a lack of mutants. Recent papers from two groups have shed new light on the function of two different MAP kinases. The Arabidopsis MPK4 gene appears to negatively regulate salicylic acid-mediated defense responses and positively regulate jasmonic acid-induced responses. The tobacco SIPK gene (orthologous to Arabidopsis MPK6) appears to positively regulate programmed cell death.
authors.forename: R W
authors.initials: RW
authors.lastname: Innes
mesh_terms: D017360:Arabidopsis / Q000201:enzymology* / Q000382:microbiology / Q000502:physiology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000502:physiology; D020935:MAP Kinase Signaling System; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D009154:Mutation; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D015398:Signal Transduction
chemical_list: D020928:Mitogen-Activated Protein Kinases; D017027:Protein Tyrosine Phosphatases