Document Detail

G proteins as regulators in ethylene-mediated hypoxia signaling.
MedLine Citation:
PMID:  20948297     Owner:  NLM     Status:  MEDLINE    
Waterlogging or flooding are frequently or constitutively encountered by many plant species. The resulting reduction in endogenous O2 concentration poses a severe threat. Numerous adaptations at the anatomical, morphological and metabolic level help plants to either escape low oxygen conditions or to endure them. Formation of aerenchyma or rapid shoot elongation are escape responses, as is the formation of adventitious roots. The metabolic shift from aerobic respiration to anaerobic fermentation contributes to a basal energy supply at low oxygen conditions. Ethylene plays a central role in hypoxic stress signaling, and G proteins have been recognized as crucial signal transducers in various hypoxic signaling pathways. The programmed death of parenchyma cells that results in hypoxia-induced aerenchyma formation is an ethylene response. In maize, aerenchyma are induced in the absence of ethylene when G proteins are constitutively activated. Similarly, ethylene induced death of epidermal cells that cover adventitious roots at the stem node of rice is strictly dependent on heterotrimeric G protein activity. Knock down of the unique Gα gene RGA1 in rice prevents epidermal cell death. Finally, in Arabidopsis, induction of alcohol dehydrogenase with resulting increased plant survival relies on the balanced activities of a small Rop G protein and its deactivating protein RopGAP4. Identifying the general mechanisms of G protein signaling in hypoxia adaptation of plants is one of the tasks ahead.
Bianka Steffens; Margret Sauter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Plant signaling & behavior     Volume:  5     ISSN:  1559-2324     ISO Abbreviation:  Plant Signal Behav     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-10-20     Completed Date:  2011-01-20     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  101291431     Medline TA:  Plant Signal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  375-8     Citation Subset:  IM    
Botanisches Institut, Universität Kiel, Kiel, Germany.
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MeSH Terms
Cell Hypoxia
Ethylenes / metabolism*
GTP-Binding Proteins / metabolism*
Gene Expression Regulation, Plant
Oxygen / metabolism*
Plants / metabolism*
Signal Transduction*
Reg. No./Substance:
0/Ethylenes; 7732-18-5/Water; 7782-44-7/Oxygen; 91GW059KN7/ethylene; EC 3.6.1.-/GTP-Binding Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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