Ascorbate peroxidase activity in resistant and susceptible plants of Lycopersicon esculentum
De Tullio, M.; Arrigoni, O.
Bollettino della Societa Italiana di Biologia Sperimentale 68(10): 613-617
1992
ISSN/ISBN: 0037-8771 PMID: 1295516 Document Number: 390592
Activity of redox-enzymes of AA system and of catalase was measured in two near-isogenic tomato lines, respectively resistant and susceptible to Tobacco Mosaic Virus infection. AFR reductase, DHA reductase and catalase showed quite similar activities in both lines, whereas AA peroxidase activity in resistant plants was 75% higher than in susceptible ones, with Km values about 4-fold lower. These data suggest that hydrogen peroxide scavenging operated by AA peroxidase could play an important role in the development of biological defence mechanisms against pathogens.