DCMU - wikipedia DCMU DCMU Names Other names 3 - ( 3, 4 - Dichlorophenyl ) - 1, 1 - dimethylurea, Karmex, Diuron, Direx Identifiers CAS Number 330 - 54 - 1 3D model ( JSmol ) Interactive image ChEBI CHEBI : 116509 ChEMBL ChEMBL278489 ChemSpider 3008 ECHA InfoCard 100.005. 778 EC Number 206 - 354 - 4 KEGG C18428 PubChem CID 3120 RTECS number YS8925000 UNII 9I3SDS92WY UN number 3077, 2767 InChI InChI = 1S / C9H10Cl2N2O / c1 - 13 ( 2 ) 9 ( 14 ) 12 - 6 - 3 - 4 - 7 ( 10 ) 8 ( 11 ) 5 - 6 / h3 - 5H, 1 - 2H3, ( H, 12, 14 ) Key : XMTQQYYKAHVGBJ - UHFFFAOYSA - N InChI = 1 / C9H10Cl2N2O / c1 - 13 ( 2 ) 9 ( 14 ) 12 - 6 - 3 - 4 - 7 ( 10 ) 8 ( 11 ) 5 - 6 / h3 - 5H, 1 - 2H3, ( H, 12, 14 ) Key : XMTQQYYKAHVGBJ - UHFFFAOYAZ SMILES Clc1ccc ( NC ( = O ) N ( C ) C ) cc1Cl Properties Chemical formula C H Cl N O Molar mass 233.09 g mol Appearance white crystalline solid Density 1.48 g / cm Melting point 158 ° C ( 316 ° F ; 431 K ) Boiling point 180 ° C ( 356 ° F ; 453 K ) Solubility in water 42 mg / L Vapor pressure 0.000000002 mmHg ( 20 ° C ) Hazards GHS pictograms GHS signal word Warning GHS hazard statements H302, H351, H373, H400, H410 GHS precautionary statements P201, P202, P260, P264, P270, P273, P281, P301 + 312, P308 + 313, P314, P330, P391, P405, P501 Flash point noncombustible US health exposure limits ( NIOSH ) : PEL ( Permissible ) none REL ( Recommended ) TWA 10 mg / m IDLH ( Immediate danger ) N.D. Except where otherwise noted, data are given for materials in their standard state ( at 25 ° C ( 77 ° F ), 100 kPa ). Y verify ( what is ? ) Infobox references DCMU ( 3 - ( 3, 4 - dichlorophenyl ) - 1, 1 - dimethylurea ) is an algicide and herbicide of the aryl urea class that inhibits photosynthesis. It was introduced by Bayer in 1954 under the trade name of Diuron. Mechanism of action DCMU is a very specific and sensitive inhibitor of photosynthesis. It blocks the plastoquinone binding site of photosystem II, disallowing the electron flow from where it is generated, in photosystem II, to plastoquinone. This interrupts the photosynthetic electron transport chain in photosynthesis and thus reduces the ability of the plant to turn light energy into chemical energy ( ATP and reductant potential ). DCMU only blocks electron flow from photosystem II, it has no effect on photosystem I or other reactions in photosynthesis, such as light absorption or carbon fixation in the Calvin cycle. However, because it absorbs electrons oxidized from water in PS II, the electron `` hole '' of PS I can not be satisfied, effectively shutting down `` linear '' photosynthesis by blocking the reduction of NADP to NADPH. At the same time, it was found that DCMU not only does not inhibit the cyclic photosynthetic pathway, but, under certain circumstances, actually stimulates it. Because of these effects, DCMU is often used to study energy flow in photosynthesis. References ^ Jump up to : `` NIOSH Pocket Guide to Chemical Hazards # 0247 ''. National Institute for Occupational Safety and Health ( NIOSH ). Jump up ^ `` Diuron Data Sheet ''. Jump up ^ Metz, J ; Pakrasi, H ; Seibert, M ; Arntzer, C ( 1986 ). `` Evidence for a dual function of the herbicide - binding D1 protein in photosystem II ''. FEBS Letters. 205 ( 2 ) : 269. doi : 10.1016 / 0014 - 5793 ( 86 ) 80911 - 5. Jump up ^ HUBER, S.C. EDWARDS, G.E. ( 1976 ), Studies on the Pathway of Cyclic Electron Flow in Mesophyll Chloroplasts of a C4 Plant, Biochimica et Biophysica Acta ( BBA ) - Bioenergetics, Volume 449, Issue 3, 6 December 1976, Pages 420 - 433, doi : 10.1016 / 0005 - 2728 ( 76 ) 90153 - 5 Jump up ^ `` Regulation of Cyclic Photophosphorylation during Ferredoxin - Mediated Electron Transport : Effect of DCMU and the NADPH / NADP Ratio ''. Plant Physiol. 83 ( 4 ) : 965 -- 9. April 1987. doi : 10.1104 / pp. 83.4. 965. PMC 1056483. PMID 16665372. Pest control : herbicides Anilides / anilines acetochlor alachlor asulam benfluralin butachlor diethatyl diflufenican dimethenamid flamprop metazachlor metolachlor pendimethalin pretilachlor propachlor propanil trifluralin Aromatic acids aminopyralid chloramben clopyralid dicamba picloram pyrithiobac quinclorac quinmerac Arsenicals cacodylic acid copper arsenate DSMA MSMA Organophosphorus bensulide bialaphos ethephon fosamine glufosinate glyphosate piperophos Phenoxy 2, 4 - D 2, 4 - DB dichlorprop fenoprop MCPA MCPB 2, 4, 5 - T Pyridines dithiopyr fluroxypyr imazapyr thiazopyr triclopyr Quaternary diquat MPP paraquat Triazines ametryn atrazine cyanazine hexazinone prometon prometryn propazine simazine simetryn terbuthylazine terbutryn Ureas chlortoluron DCMU linuron metsulfuron - methyl monolinuron tebuthiuron Others 3 - AT aminocyclopyrachlor bromoxynil clomazone DCBN dinoseb juglone mesotrione methazole metam sodium metamitron metribuzin pyribenzoxim sulfentrazone Retrieved from `` https://en.wikipedia.org/w/index.php?title=DCMU&oldid=863071407 '' Categories : Herbicides Ureas Toxicology Anilines Chloroarenes Hidden categories : ECHA InfoCard ID from Wikidata Chembox having GHS data Articles containing unverified chemical infoboxes All articles with unsourced statements Articles with unsourced statements from April 2014 Talk About Wikipedia تۆرکجه Čeština Deutsch Español فارسی Français Nederlands Oʻzbekcha / ўзбекча Polski Русский Српски / srpski Srpskohrvatski / српскохрватски 中文 4 more Edit links This page was last edited on 8 October 2018, at 14 : 48 ( UTC ). 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Question: dcmu inhibits electron transport in chloroplast by preventing the reduction of
Answer: NADP+ to NADPH