title: [Cinnamic acid 4-hydroxylase and 0-methyltransferase activities in leaves of hypersensitive tobacco plants infected by tobacco mosaic virus].
abstract: Tobacco leaves of Nicotiana tabacum L., variety Samsun NN, show a low cinnamic acid-4-hydroxylase activity and a rather high O-methyltransferase activity. Caffeic acid, the substrate of the latter enzyme, is methylated specifically in the meta position. In TMV-infected leaves a strong increase in the activities of phenylalanine ammonia-lyase and of these two enzymes occurs at the time of appearance and development of the necrotic reaction.
mesh_terms: D002109:Caffeic Acids / Q000378:metabolism; D002934:Cinnamates; D005838:Genotype; D008780:Methyltransferases / Q000378:metabolism*; D006899:Mixed Function Oxygenases / Q000378:metabolism*; D010935:Plant Diseases; D010947:Plants, Toxic; D014026:Nicotiana / Q000201:enzymology*; D014027:Tobacco Mosaic Virus
chemical_list: D002109:Caffeic Acids; D002934:Cinnamates; D006899:Mixed Function Oxygenases; D008780:Methyltransferases
vernacular_title: Activités acide cinnamique 4-hydroxylase et O-méthyltransférase dans des feuilles de tabac hypersensible infectées par le virus de la mosaïque du tabac