Root growth and modifications of ROS-scavenging systems were investigated in transgenic rice (Oryza sativa L., cv. Zhonghua no. 11) co-expressing glutathione-S-transferase (GST, EC. 184.108.40.206) and catalase 1 (CAT1, EC 220.127.116.11) and nontransgenic rice exposed to just salt or heat and their combination. The higher number of adventitious roots but the lower root to shoot ratio were observed in the stressed transgenics as compared with nontransgenics. Most antioxidant enzymes, such as CAT, GST, ascorbate peroxidase (APX, EC 18.104.22.168), glutathione reductase (GR, EC.22.214.171.124), dehydroascorbate reductase (DHAR, EC.126.96.36.199), and the redox state of glutathione and ascorbate, measured in the transformant roots, were significantly different from those in nontransformant roots following the three types of stress. The variations of root growth and antioxidant systems in the stressed transgenic rice may be attributed to not only the GST and CAT1 transgenes but also the coordination of the ascorbate-glutathione cycle.
Russian Journal of Plant Physiology – Springer Journals
Published: Jul 7, 2010
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