Document Detail

Modulation of reactive oxygen species by salicylic acid in Arabidopsis seed germination under high salinity.
MedLine Citation:
PMID:  21150285     Owner:  NLM     Status:  MEDLINE    
Potential roles of salicylic acid (SA) on seed germination have been explored in many plant species. However, it is still controversial how SA regulates seed germination, mainly because the results have been somewhat variable, depending on plant genotypes used and experimental conditions employed. We found that SA promotes seed germination under high salinity in Arabidopsis. Seed germination of the sid2 mutant, which has a defect in SA biosynthesis, is hypersensitive to high salinity, but the inhibitory effects are reduced in the presence of physiological concentrations of SA. Abiotic stresses, including high salinity, impose oxidative stress on plants. Endogenous contents of H(2)O(2) are higher in the sid2 mutant seeds. However, exogenous application of SA reduces endogenous level of reactive oxygen species (ROS), indicating that SA is involved in plant responses to ROS-mediated damage under abiotic stress conditions. Gibberellic acid (GA), a plant hormone closely associated with seed germination, also reverses the inhibitory effects of high salinity on seed germination and seedling establishment. Under high salinity, GA stimulates SA biosynthesis by inducing the SID2 gene. Notably, SA also induces genes encoding GA biosynthetic enzymes. These observations indicate that SA promotes seed germination under high salinity by modulating antioxidant activity through signaling crosstalks with GA.
Sangmin Lee; Chung-Mo Park
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-12-01
Journal Detail:
Title:  Plant signaling & behavior     Volume:  5     ISSN:  1559-2324     ISO Abbreviation:  Plant Signal Behav     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-04-22     Completed Date:  2011-08-23     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:  1534-6     Citation Subset:  IM    
Molecular Signaling Laboratory, Department of Chemistry, Seoul National University, Seoul, Korea.
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MeSH Terms
Arabidopsis / embryology*,  genetics
Oxidative Stress
Reactive Oxygen Species / metabolism*
Salicylic Acid / metabolism*
Seeds / metabolism,  physiology*
Sodium Chloride / analysis*
Reg. No./Substance:
0/Reactive Oxygen Species; 69-72-7/Salicylic Acid; 7647-14-5/Sodium Chloride

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

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