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Signal Transduction of Plant Hormone Ethylene

Signal Transduction of Plant Hormone Ethylene. Dr. Hongwei Guo Peking University June 22, 2006. Plant Growth and Development. Highly plastic ---- plants cannot run ! Perception of environmental signals involves multiple plant hormones. environmental signals: light gravity

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Signal Transduction of Plant Hormone Ethylene

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  1. Signal Transduction of Plant Hormone Ethylene Dr. Hongwei Guo Peking University June 22, 2006

  2. Plant Growth and Development • Highly plastic ----plants cannot run! • Perception of environmental signals involves multiple plant hormones • environmental signals: • light • gravity • temperature • water • nutrients • touch • Pathogens, etc

  3. H H C C H H Ethylene (C2H4) Plant hormones • Classical Five: • Auxins • Gibberellins (GAs) • Cytokinins • Abscisic acid (ABA) • Ethylene • Newly defined: • Brassinosteroids • Jasmonic acid (JA) • Salicylic acid (SA) • Nitric oxide (NO) The simplest molecule on the earth that has a biological function

  4. abscission senescence Ethylene can do more… --Germination --Senescence --Abscission --Nodulation --Stress tolerance --Pathogen defense pathogen defense

  5. A simple genetic systemArabidopsisseedling • Shortened root and hypocotyl • Swollen hypocotyl • Exaggerated apical hook …triple response… -C2H4 +C2H4

  6. Ethylene Response Mutants ctr ein wild type 5 ctr (constitutive triple response) 10 ein (ethylene insensitive) + C2H4 - C2H4

  7. ER cytoplasm nucleus EIL1 EIL1 A genetic model of ethylene signaling pathway

  8. SCFEBF1/2 EIN3 ethylene response A SCF complex degrades EIN3 protein 26S proteasome (degraded) EIN3 Ub E2 EBF1/2 ASK1 Rbx Cullin1 (Guo and Ecker, Cell 2003)

  9. Cul1 ASK Rbx A working model on the ethylene signaling pathway in Arabidopsis Signals and Stress (SCFEBF1/2 E3 ligase) C2H4 Receptors (ETR1/2 ERS1/2 EIN4) CTR1 EIN2 EBF1/2 EIN6? EIN5 EIN3 EIL1 EBF1/2 mRNA Target genes EBS (Guo and Ecker, 2004)

  10. environmental stimuli deveopmental signals cytokinin auxin JA Glucose SCFCOI1 SAM ACS ACC ACO C2H4 Receptors/ CTR1 (RNAi) EIN5 EIN2 SCFEBF EIN3/EIL1 EIL2-5? Primary ethylene response genes ERF1 others TFs EDFs ERFs Light others Expansins HLS1 PRs Other types of ethylene responses Cell growth (elongation/ expansion) Differential growth (hook formation) Defense response

  11. Acknowledgments Peking University Fengying An Hongjiang Li Xiaorui Guo Qiuchen Xing Salk Institute, USA Dr. Joseph Ecker UCLA, USA Dr. Chentao Lin IBMP, France Dr. Pascal Genschik

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