RESUMO
Phytotoxicity of colloidal solutions of metal-containing nanoparticles (Ag, Cu, Fe, Zn, Mn) has been investigated using a standard Allium cepa (L.) test system. Toxicity of experimental solutions at the organism level was evaluated in terms of biomass growth of onion roots, and cytotoxicity was estimated by the mitotic index of root meristem cells. The colloidal solutions of metal nanoparticles inhibited the growth of Allium cepa (L.) roots due to their ability to penetrate into cells and interact with their components, and thus to inhibit mitosis. According to our results cytotoxicity of test solutions decreases in the following order: Cu > or = Zn > Ag > or = Fe. Solution of Mn-containing nanoparticles revealed physiological activity according to root growth reaction.
Assuntos
Cobre/toxicidade , Ferro/toxicidade , Meristema/efeitos dos fármacos , Nanopartículas Metálicas/toxicidade , Cebolas/efeitos dos fármacos , Raízes de Plantas/efeitos dos fármacos , Prata/toxicidade , Zinco/toxicidade , Transporte Biológico , Proliferação de Células/efeitos dos fármacos , Coloides , Cobre/química , Ferro/química , Manganês/química , Manganês/farmacologia , Meristema/crescimento & desenvolvimento , Meristema/ultraestrutura , Nanopartículas Metálicas/química , Mitose/efeitos dos fármacos , Índice Mitótico , Cebolas/crescimento & desenvolvimento , Cebolas/ultraestrutura , Raízes de Plantas/crescimento & desenvolvimento , Raízes de Plantas/ultraestrutura , Prata/química , Zinco/químicaRESUMO
The results of the study of H2O2 treatment of wheat leaf glycolipid composition are presented. The fraction changes depended upon H2O2 concentration, way of treatment and exposition. The most typical reaction was galactolipid (MGDG, DGDG) content increase while lower sulpholipid variations at low doses of the root treatment and at leaf spraying.
Assuntos
Galactolipídeos/metabolismo , Glicolipídeos/metabolismo , Peróxido de Hidrogênio/farmacologia , Triticum , Relação Dose-Resposta a Droga , Folhas de Planta/efeitos dos fármacos , Folhas de Planta/crescimento & desenvolvimento , Folhas de Planta/metabolismo , Fatores de Tempo , Triticum/efeitos dos fármacos , Triticum/crescimento & desenvolvimento , Triticum/metabolismoRESUMO
Review deals with some modern views of the membrane chloroplast lipid composition role in low-, high temperature and water stress adaptive reactions. It is shown that the transformed changes in membrane lipid composition determined the biochemical adaptive process due homeostasis support and preservation of the lipid bilayer fluidity, being necessary for their normal functioning in the changed environmental conditions. The aspects of long-term and short-term adaptive reactions in protein/lipid membrane complexes is discussed. The lipid sensor functions at genetically regulation of adaptive mechanisms is considered.
Assuntos
Adaptação Fisiológica , Cloroplastos/fisiologia , Lipídeos de Membrana/metabolismo , Cloroplastos/metabolismo , Temperatura Baixa , Meio Ambiente , Homeostase , Temperatura Alta , Fluidez de Membrana , ÁguaRESUMO
Composition of lipids and sterols in leaf tissues of winter wheat varieties with different drought resistance was investigated under the heat and water deficit. The data obtained have shown that the water deficit induced accumulation of sulpholipids and sitosterol accompanied by a decrease of stigmasterol in resistant plants. A decrease of monogalactosyldiacylglycerol, sulpholipid, phosphatidyl choline and sitosterol was observed against an increase of the stigmasterol content in the sensitive plants. The action of high temperature induced accumulation of sulpholipid, phosphatidyl glycerol, sitosterol and cholesterol accompanied by a decrease of campasterol and stigmasterol in a resistant variety. A sensitive variety was characterized by a decrease of sulpholipid and sitosterol.
