Hydrogen peroxide-scavenging enzymes and antioxidants in Echinochloa frumentacea as affected by triazole growth regulators |
| |
Authors: | N Sankhla A Upadhyaya Tim D Davis D Sankhla |
| |
Institution: | (1) Texas Agricultural Experiment Station, Texas A&M University Research and Extension Center, 17360 Coit Rd., 75252-6599 Dallas, TX, USA;(2) USDA Climate Stress Lab., 20705 Beltsville, MD, USA;(3) Texas A&M University Research and Extension Center, 17360 Coit Rd., 75252 Dallas, TX, USA |
| |
Abstract: | Paclobutrazol (PBZ)- and uniconazole (UCZ)-treated plants of Echinochloa frumentacea were shorter but had much wider leaves than untreated controls 10 days after treatment. Leaves of treated plants had a slightly higher concentration of soluble protein than the controls and exhibited enhanced activities of ascorbate peroxidase, monodehydroascorbate (MDHA) reductase, and glutathione (GSH) reductase. The triazoles did not influence the activity of dehydroascorbate (DHA) reductase. The leaves of treated plants had increased concentrations of water-soluble sulfhydryls and ascorbic acid. In contrast, the concentration of malondialdehyde (MDA), a by-product of lipid peroxidation, was lower in the leaves of treated plants than in controls. These results suggest that triazole growth regulators increased the activity of the endogenous H2O2-scavenging system in E. frumentacea. |
| |
Keywords: | Ascorbate peroxidase dehydroascorbate reductase glutathione reductase malondialdehyde monodehydroascorbate reductase paclobutrazol uniconazole |
本文献已被 SpringerLink 等数据库收录! |
|