Document Detail

Sulfite Reductase Protects Plants Against Sulfite Toxicity.
MedLine Citation:
PMID:  23221833     Owner:  NLM     Status:  Publisher    
Plant sulfite reductase (SiR, EC catalyzes the reduction of sulfite to sulfide in the reductive sulfate assimilation pathway. Comparison of SiR expression in tomato (Lycopersicon esculentum/Solanum lycopersicum Mill, cv. Rheinlands Ruhm) and Arabidopsis thaliana plants revealed that SiR is expressed in a different tissue-dependent manner that likely reflects dissimilarity in sulfur metabolism between the plant species. Using Arabidopsis and tomato SiR mutants with modified SiR expression, we show here that resistance to ectopically applied SO2/sulfite is a function of SiR expression levels and that plants with reduced SiR expression exhibit higher sensitivity than the wild type, as manifested in pronounced leaf necrosis and chlorophyll bleaching. The sulfite sensitive mutants accumulate applied sulfite and show a decline in glutathione levels. In contrast, mutants that overexpress SiR are more tolerant to sulfite toxicity; exhibiting little or no damage. Resistance to high sulfite application is manifested by fast sulfite disappearance and an increase in glutathione levels. The notion that SiR plays a role in protection of plants against sulfite is supported by the rapid up-regulation of SiR transcript and activity within 30 min of sulfite injection into Arabidopsis and tomato leaves. Peroxisomal sulfite oxidase (SO) transcripts and activity levels are likewise promoted by sulfite application as compared with water injection controls. These results indicate that, in addition to participating in the sulfate assimilation reductive pathway, SiR also plays a role in protecting leaves against the toxicity of sulfite accumulation.
Dmitry Yarmolinsky; Galina Brychkova; Robert Fluhr; Moshe Sagi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-7
Journal Detail:
Title:  Plant physiology     Volume:  -     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1 Ben-Gurion University;
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