title: [Ultrastructural changes caused by a herbicide, picloram in technical dosage (70,4%), in a plankton alga, Dunaliella bioculta (Volvocales)].
abstract: A study on the effects of an auxin-like herbicide-picloram (techinical grade 70,4%)--was carried out on a planktonic green Alga, Dunaliella bioculata. At concentrations about 250 mug/ml, the cellular growth decreases while at 400 mug/ml it is completely inhibited. Concentrations of 250-300 mug/ml induce the fall of flagella and an increase of the cellular volume; granulous inclusions-nuclear bodies-are observed inside the nucleus; Golgi apparatus is abnormally developed. The vascuolar system is particularly disturbed: its volume increases; vesicles, cytoplasmic and membrane fragments and osmiophilic granulations can be observed inside vacuoles under the electron microscope.
mesh_terms: D002455:Cell Division / Q000187:drug effects; D002467:Cell Nucleus / Q000187:drug effects; D003593:Cytoplasm / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D056890:Eukaryota / Q000187:drug effects* / Q000648:ultrastructure; D005407:Flagella / Q000187:drug effects; D006056:Golgi Apparatus / Q000187:drug effects; D010839:Phytoplankton / Q000187:drug effects; D010846:Picloram / Q000494:pharmacology*; D010848:Picolinic Acids / Q000494:pharmacology*; D014617:Vacuoles / Q000187:drug effects
chemical_list: D010848:Picolinic Acids; D010846:Picloram
vernacular_title: Modifications ultrastructurales provoquées par un herbicide, le piclorame en formulation technique, (70,4%) chez une algue planctonique, le Dunaliella biochulata (Volvocales)