Mitogen-activated protein kinase signaling in postgermination arrest of development by abscisic acid.
Abscisic acid (ABA) mediates plant responses to environmental stress, particularly to water status. During germination, the embryo emerges from dormancy as the ABA concentration declines. Exposure to exogenous ABA during germination arrests development rapidly, but reversibly, enabling seedlings to withstand early water stress without loss of viability. Postgermination proteolytic degradation of the essential ABI5 transcription factor is interrupted by perception of an increase in ABA concentration, leading to ABI5 accumulation and reactivation of embryonic genes. Making use of the ABA-hypersensitive hyl1 mutant of Arabidopsis, we show that the ABA signal is transmitted to the transcriptional apparatus through mitogen-activated protein kinase signaling.
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Delaware Biotechnology Institute, 15 Innovation Way, Newark 19711, USA.
Han
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Guevara-Garcia
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Fedoroff
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D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D029681:Arabidopsis Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D050976:Basic-Leucine Zipper Transcription Factors; D004791:Enzyme Inhibitors / Q000494:pharmacology; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D018525:Germination; D020935:MAP Kinase Signaling System; D020929:Mitogen-Activated Protein Kinase Kinases / Q000096:biosynthesis / Q000235:genetics; D010940:Plant Proteins / Q000502:physiology*; D030821:Plants, Genetically Modified; D016601:RNA-Binding Proteins / Q000235:genetics / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics; D014158:Transcription, Genetic
C409743:ABI5 protein, Arabidopsis; D029681:Arabidopsis Proteins; D050976:Basic-Leucine Zipper Transcription Factors; D004791:Enzyme Inhibitors; C420966:HYL1 protein, Arabidopsis; D010940:Plant Proteins; D016601:RNA-Binding Proteins; D014157:Transcription Factors; D000040:Abscisic Acid; C458516:AtMPK3 protein, Arabidopsis; D020929:Mitogen-Activated Protein Kinase Kinases