Document Detail

Oxidative stress in cucumber (Cucumis sativus L) seedlings treated with acifluorfen.
MedLine Citation:
PMID:  11355639     Owner:  NLM     Status:  MEDLINE    
Treatment of diphenyl ether herbicide acifluorfen-Na (AF-Na) to intact cucumber (Cucumis sativus L cv Poinsette) seedlings induced overaccumulation of protoporphyrin IX in light (75 mumole m-2 s-1). The extra-plastidic protoporphyrin IX accumulated during the light exposure disappeared within two hours of transfer of acifluorofen-treated seedlings to darkness. The dark disappearance was due to re-entry of migrated protoporphyrin IX into the plastid and its subsequent conversion to protochlorophyllide. In light, protoporphyrin IX acted as a photosensitizer and caused generation of active oxygen species. The latter caused damage to the cellular membranes by peroxidation of membrane lipids that resulted in production of malondialdehyde. Damage to the plastidic membranes resulted in damage to photosystem I and photosystem II reactions. Dark-incubation of herbicide-sprayed plants before their exposure to light enhanced photodynamic damage due to diffusion of the herbicide to the site of action. Compared to control, in treated samples the cation-induced increases in variable fluorescence/maximum fluorescence ratio and increase in photosystem II activity was lower due to reduced grana stacking in herbicide-treated and light-exposed plants.
I Gupta; B C Tripathy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Indian journal of biochemistry & biophysics     Volume:  37     ISSN:  0301-1208     ISO Abbreviation:  Indian J. Biochem. Biophys.     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2001-05-17     Completed Date:  2001-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0310774     Medline TA:  Indian J Biochem Biophys     Country:  India    
Other Details:
Languages:  eng     Pagination:  498-505     Citation Subset:  IM    
School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
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MeSH Terms
Cucumis sativus / drug effects*,  metabolism
Herbicides / pharmacology*
Nitrobenzoates / pharmacology*
Oxidative Stress*
Protoporphyrins / pharmacology
Reg. No./Substance:
0/Herbicides; 0/Nitrobenzoates; 0/Protoporphyrins; 50594-66-6/acifluorfen; 553-12-8/protoporphyrin IX

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

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