Delay of Senescence of Detached Cucumber Cotyledons by Triadimefon

• Published in: Biologia plantarum Vol. 46; no. 4; pp. 571 - 575
• Main Authors: Feng, Z.Z., Guo, A.H., Feng, Z.W.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.01.2003
• Subjects: Accumulation; Antioxidants; Ascorbic acid; Carotenoids; Catalase; Cotyledons; Cucumbers; Detaching; Hydrogen peroxide; L-Ascorbate peroxidase; Lipid peroxidation; Lipids; Oxidation; Peroxidase; Peroxidation; Reactive oxygen species; Senescence; Superoxide dismutase; Triadimefon; Vegetables
• DOI: 10.1023/A:1024871713387
• ISSN: 0006-3134

Changes in contents of reactive oxygen species (O2− and H2O2) and non-enzymatic antioxidants, activities of antioxidant enzymes and lipid peroxidation were investigated during senescence of detached cucumber cotyledons dipped in water (control) and 20 mg dm−3 triadimefon (TDM). O2− and H2O2 accumulation and lipid peroxidation were observed during senescence of cucumber cotyledons, which coincided with a drop in the contents of carotenoids (Car) and ascorbic acid (AsA), and the activities of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX), and an increase in the activity of peroxidase (POD). However, TDM could significantly inhibit the accumulation of O2− and H2O2, and lipid peroxidation by preventing the decrease of CAT, APX, Car and AsA and the increase of POD, while TDM had little effect on SOD activity during the senescence. Therefore we can draw a conclusion that TDM protects the membrane system and retards the senescence of detached cucumber cotyledons.