A secondary mode of action of the herbicide lenacil: Modification of K+ permeability of Acer pseudoplatanus cells

1984

Abstract The action of lenacil on plasmalemma permeability to K+, transmembrane electric potential difference (PD) calculated from the tetraphenylphosphonium distribution, proton extrusion and intracellular pH of Acer pseudoplatanus cells calculated from the 5,5-dimethyloxazolidine,4-dione distribution, was studied and compared with the action of fusicoccin (FC) and diethylstilbestrol (DES). The three compounds temporarily stimulated the rate of 86Rb+ uptake with a half-maximum effect at 5.0 μM for 3-cyclohexyl-6, 7-dihdro-1H-cyclopentapyrimidine-2,4(3H,5H)-dione (lenacil). Lenacil and FC had no action on transmembrane electric potential difference, whereas DES decreased it. Lenacil inhibit…

Characterization of a proton pump from Acer pseudoplatanus cell microsomes

1985

Abstract An Acer pseudoplatanus cell microsomal fraction was enriched in ATPase by sedimentation through a sucrose cushion and treatment with Triton X-100. This activity, which reached 0.9 μmol P i min −1 mg −1 protein, was specific for ATP, slightly stimulated by K + , inhibited by orthovanadate and diethylstilbestrol, insensitive to oligomycin and azide, and had a K m - value of 0.51 mM for MgATP. ATP-dependent proton translocation was demonstrated by the ΔpH probe acridine orange. This activity had a optimum at pH 6.5, was substrate specific for ATP, and was strongly dependent on K + . Preparations of plasma membrane ATPase from A. pseudoplatanus cell culture thus posses biochemical prop…

Absorption, translocation and metabolism of pyridate in a tolerant crop (Zea mays) and two susceptible weeds (Polygonum lapathifolium L. and Chenopod…

1988

Summary Absorption, translocation and metabolism of 14C-pyridate were compared in tolerant maize. moderately susceptible Polygonum lapathifolium and susceptible Chenopodium album. Foliar absorption was limited in all species, but comparatively higher penetration levels were observed in younger leaves of dicotyledonous species. The absorbed radioactivity was not very mobile and translocation appeared mainly sym-plastic. Herbicide selectivity could not be explained on the basis of absorption and transport. Chenopodium and P. lapathifolium degraded pyridate and formed unstable water-soluble conjugates that easily released a phytotoxic metabolite. By contrast, more stable unidentified water-sol…

Effects of isoxaben on sensitive and tolerant plant cell cultures .I. Metabolic fate of isoxaben

1991

International audience

Effect of a suicide-substrate of cytochrome P-450 on the metabolism of phenylureas in wheat plants

1985

National audience

Pesticides : interactions phytotoxiques

1983

National audience

Localization within chloroplasts of protoporphyrinogen oxidase, the target enzyme for diphenylether-like herbicides

1992

International audience

Induced changes of chlorotoluron metabolism in wheat cell suspension cultures

1989

International audience

Etude sur le mode d'action d'un herbicide : l'isoxaben. Effets sur des cultures de cellules de soja sensibles et tolerantes

1991

National audience

Effect of mixed function oxidase inhibitors on the toxicite chlortoluron and isoproturon to wheat

1985

International audience

Les herbicides

1990

Mode of action of the herbicide siduron on wheat

1987

International audience

Protorphyrinogen oxidase inhibition by three peroxidizing herbicides : oxadiazon , LS 82-556 and M and B 39279

1989

International audience

The double stranded RNA associated with the 447 cytoplasmic male sterelity in Vicia faba is packages together with its replicase in cytoplasmic membr…

1990

33 ref.; International audience

La sterilite male nucleo-cytoplasmique chez la feverole Vicia faba L. :2. Etude cytologique et biochimique de particules de type viral associees a la…

1982

National audience

Immunodetection of a 90 000-Mr polypeptide related to yeast plasma membrane ATPase in plasma membrane from maize shoots

1986

International audience

Recherche: mecanismes physiologiques de la selectivite des herbicides

1987

National audience

Vers une maitrise du caractère de la stérilité mâle nucleocytoplasmique (SMC) ?

1987

National audience

New developments in CMS in Vicia faba L.

1984

International audience

Characterization of ATPase from maize shoot plasma membrane prepared by partition in an aqueous polymer two phase system

1986

41 ref.; International audience

Recent advances in the mode of action of diphenyl ethers and relates herbicides

1990

61 ref.; International audience

Les herbicides. Mode d'action et principes d'utilisation

1992

National audience

Cytoplasmic particles associated with CMS in Faba bean (Vicia faba L.)

1983

International audience

Recherches sur les herbicides: etat des connaissances et perspectives

1991

National audience

Etude d'une sterilite male nucleo-cytoplasmique chez la feverole. Presence de particules cytoplasmiques contenant de l'ARN.

1981

National audience

Studies on the mode of action of acifluorfen-methyl in nonchlorophyllous soybean cells

1988

International audience

Protorphyrinogen oxidase as a molecular target for diphenyl ether herbicides

1989

32 ref.; International audience

Effects of isoxaben on sensitive and tolerant plant cell cultures .II. Cellular alterations and inhibition of the synthesis of acid-insoluble cell wa…

1991

International audience

RNA containing intracellular particles in cytoplasmic male sterile Faba bean.

1981

International audience

Characterization of the mode of action of the experimental herbicide LS 82-556 [ (S)3-N-(methylbenzyl) carbamyl-5-propionyl-2,6 lutidine

1986

34 ref.; International audience

Mode d'action physiologique du EL-107 (isoxaben)

1987

National audience

Mecanismes physiologiques de la selectivite des herbicides

1987

National audience

Inhibition of adenosine triphosphatase activity from a plasma membrane fraction of Pseudoplatanus cells by carbanilate derivatives

1987

International audience