Kopp M, Fritig B, Hirth L
C R Acad Hebd Seances Acad Sci D. 1975 Feb 17;280(7):923-5.
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.
烟草品种萨姆逊NN的烟草叶片显示出较低的肉桂酸-4-羟化酶活性和较高的O-甲基转移酶活性。后一种酶的底物咖啡酸在间位被特异性甲基化。在感染烟草花叶病毒（TMV）的叶片中，在坏死反应出现和发展时，苯丙氨酸解氨酶以及这两种酶的活性会大幅增加。
