DNA synthesis in wounded or TMV-infected leaves from sensitive and hypersensitive tobacco plants.
After wounding or viral infection, tobacco leaves synthesized DNA, as evidenced by [3H]thymidine incorporation. This synthesis was maximal 22 h after infection or 46 h after wounding. It took place before necrotic lesions appeared in hypersensitive leaves. Effects of wounding or infection was transmitted to non-damaged halves of leaves in which they also induced DNA synthesis of similar kinetics but of less magnitude. This synthesis was mostly nuclear but non-mitotic. The extent of synthesis varied with the viral inoculum concentration and with the age of the leaves and correlated with the subsequent necrotic reaction.
D004247:DNA / Q000096:biosynthesis*; D010641:Phenotype; D010947:Plants, Toxic; D013997:Time Factors; D014026:Nicotiana / Q000235:genetics / Q000378:metabolism*; D014027:Tobacco Mosaic Virus; D014777:Virus Diseases / Q000378:metabolism*
D004247:DNA