Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Photosystem II inhibitors

Electron Transport Between Photosystem I and Photosystem II Inhibitors. The interaction between PSI and PSII reaction centers (Fig. 1) depends on the thermodynamically favored transfer of electrons from low redox potential carriers to carriers of higher redox potential. This process serves to communicate reducing equivalents between the two photosystem complexes. Photosynthetic and respiratory membranes of both eukaryotes and prokaryotes contain stmctures that serve to oxidize low potential quinols while reducing high potential metaHoproteins (40). In plant thylakoid membranes, this complex is usually referred to as the cytochrome b /f complex, or plastoquinolplastocyanin oxidoreductase, which oxidizes plastoquinol reduced in PSII and reduces plastocyanin oxidized in PSI (25,41). Some diphenyl ethers, eg, 2,4-dinitrophenyl 2 -iodo-3 -methyl-4 -nitro-6 -isopropylphenyl ether [69311-70-2] (DNP-INT), and the quinone analogues,... [Pg.40]

Photosystem II Inhibitors. The PSII complex usually is assumed to be that stmctural entity capable of light absorption, water oxidation, plastoquiaone reduction, and generation of transmembrane charge asymmetry and the chemical potential of hydrogen ions (41). The typical PSII complex... [Pg.40]

Photosystem II inhibitors, 13 288-294 plant growth regulator synthesis and function inhibitors, 13 304—307 Herbicide analysis methods, 13 312—313 Herbicide atomizer, 23 197 Herbicide binding, polypeptide... [Pg.428]

Photosystem II inhibitors, 13 288-294 Photosystem inhibitors, electron transport between, 13 288... [Pg.704]

Trebst, A. (1991). The molecular basis of resistance of photosystem II inhibitors. In J.C. Caseley, G.W. Cussans and R.K. Atkin, eds., Herbicide Resistance in Weeds and Crops. Boston Butterworth-Heinemann, pp. 145-164. [Pg.109]

Oettmeier, W., K. Masson, C. Fedtke, J. Konze, and R.R. Schmidt (1992). Effect of different photosystem II inhibitors on chloroplasts isolated from species either susceptible or resistant toward s-triazine herbicides. Pestic. Biochem. Physiol., 18 357-367. [Pg.131]

Mitsutake, K.-I., Iwasmura, H., Shimizu, R., Fujita, T. (1986) Quantitative structure-activity relationships of photosystem II inhibitors in chloroplasts and its link to herbicidal action. J. Agric. Food Chem. 34, 725-732. [Pg.514]

Fig. 4 Dynamics of in vivo chlorophyll fluorescence (Fo) and photosynthetic efficiency (Fv/Fm) of Phaeocystis globosa during viral infection as assessed by fluorometry. Open symbols represent uninfected cultures, while the filled symbols represent virally infected P. globosa. Maximum fluorescence (Fm) was obtained after addition of the photosystem II inhibitor DCMU (20 pM final concentration). Fv equals Fm-Fo. Data are expressed in relative units (r.u.)... Fig. 4 Dynamics of in vivo chlorophyll fluorescence (Fo) and photosynthetic efficiency (Fv/Fm) of Phaeocystis globosa during viral infection as assessed by fluorometry. Open symbols represent uninfected cultures, while the filled symbols represent virally infected P. globosa. Maximum fluorescence (Fm) was obtained after addition of the photosystem II inhibitor DCMU (20 pM final concentration). Fv equals Fm-Fo. Data are expressed in relative units (r.u.)...
Many commercial herbicides kill weeds by interfering with the action of photosystem II or photosystem I. Inhibitors of photosystem II block electron flow, whereas inhibitors of photosystem I divert electrons from the terminal part of this photosystem. Photosystem II inhibitors include urea derivatives such as diuron and triazine derivatives such as atrazine. These chemicals bind to the Qg site of the D1 subunit of photosystem II and block the formation of plastoquinol (QH2). [Pg.813]

Nakajima Y, Yoshida S, Inoue Y et al. Occupation of the Qg-binding pocket by a photosystem II inhibitor triggers dark cleavage of the Dl protein subjected to brief preillumination. J Biol Chem 1996 71 17383-17389. [Pg.43]

Modeling of Photosystem II Inhibitors of the Herbicide-Binding Protein... [Pg.215]

Figure 2. The essential chemical element for the two classes of photosystem II inhibitors... Figure 2. The essential chemical element for the two classes of photosystem II inhibitors...
The above mentioned molecules were pursued as targets primarily because 1) they represent new targets for herbicide design and 2) they incorporate aspects of the model compounds 3-5, which may result in new insights into SAR requirements for the herbicidal activity of amides and carbamates. Since the models for this work are photosystem II inhibitors, insight into the binding and receptor site at or near photosystem II was expected. [Pg.183]


See other pages where Photosystem II inhibitors is mentioned: [Pg.22]    [Pg.159]    [Pg.76]    [Pg.27]    [Pg.217]    [Pg.219]    [Pg.221]    [Pg.361]    [Pg.9]   


SEARCH



II Inhibitors

Photosystem

Photosystem II

Photosystems 215

© 2024 chempedia.info