| Emerging roots alter epidermal cell fate through mechanical and reactive oxygen species signaling. | |
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MedLine Citation:
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PMID: 22904148 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A central question in biology is how spatial information is conveyed to locally establish a developmental program. Rice (Oryza sativa) can survive flash floods by the emergence of adventitious roots from the stem. Epidermal cells that overlie adventitious root primordia undergo cell death to facilitate root emergence. Root growth and epidermal cell death are both controlled by ethylene. This study aimed to identify the signal responsible for the spatial control of cell death. Epidermal cell death correlated with the proximity to root primordia in wild-type and ADVENTITIOUS ROOTLESS1 plants, indicating that the root emits a spatial signal. Ethylene-induced root growth generated a mechanical force of ~18 millinewtons within 1 h. Force application to epidermal cells above root primordia caused cell death in a dose-dependent manner and was inhibited by 1-methylcyclopropene or diphenylene iodonium, an inhibitor of NADPH oxidase. Exposure of epidermal cells not overlying a root to either force and ethylene or force and the catalase inhibitor aminotriazole induced ectopic cell death. Genetic downregulation of the reactive oxygen species (ROS) scavenger METALLOTHIONEIN2b likewise promoted force-induced ectopic cell death. Hence, reprogramming of epidermal cell fate by the volatile plant hormone ethylene requires two signals: mechanosensing for spatial resolution and ROS for cell death signaling. |
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Authors:
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Bianka Steffens; Alexander Kovalev; Stanislav N Gorb; Margret Sauter |
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Publication Detail:
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Type: Journal Article Date: 2012-08-17 |
Journal Detail:
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Title: The Plant cell Volume: 24 ISSN: 1532-298X ISO Abbreviation: Plant Cell Publication Date: 2012 Aug |
Date Detail:
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Created Date: 2012-09-28 Completed Date: 2013-02-13 Revised Date: 2013-04-16 |
Medline Journal Info:
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Nlm Unique ID: 9208688 Medline TA: Plant Cell Country: United States |
Other Details:
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Languages: eng Pagination: 3296-306 Citation Subset: IM |
Affiliation:
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Plant Developmental Biology and Plant Physiology, Institute of Botany, University of Kiel, 24118 Kiel, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amitrole
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pharmacology Biomechanics Cell Death Cyclopropanes / pharmacology Dose-Response Relationship, Drug Enzyme Inhibitors / pharmacology Ethylenes / pharmacology NADPH Oxidase / antagonists & inhibitors Onium Compounds / pharmacology Organophosphorus Compounds / pharmacology Oryza sativa / drug effects, metabolism, physiology* Plant Cells / metabolism, physiology Plant Epidermis / cytology, drug effects, metabolism, physiology* Plant Proteins / antagonists & inhibitors, metabolism Plant Roots / drug effects, metabolism, physiology* Plant Stems / drug effects, metabolism, physiology Reactive Oxygen Species / metabolism* Signal Transduction* Stress, Mechanical |
| Chemical | |
Reg. No./Substance:
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0/Cyclopropanes; 0/Enzyme Inhibitors; 0/Ethylenes; 0/Onium Compounds; 0/Organophosphorus Compounds; 0/Plant Proteins; 0/Reactive Oxygen Species; 16672-87-0/ethephon; 244-54-2/diphenyleneiodonium; 3100-04-7/1-methylcyclopropene; 61-82-5/Amitrole; 91GW059KN7/ethylene; EC 1.6.3.1/NADPH Oxidase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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