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- Title
Overexpression of the glutamine synthetase gene modulates oxidative stress response in rice after exposure to cadmium stress.
- Authors
Lee, Hye Jung; Abdula, Sailila E; Jang, Dae Won; Park, Sung-Han; Yoon, Ung-Han; Jung, Yu Jin; Kang, Kwon Kyoo; Nou, Ill Sup; Cho, Yong-Gu
- Abstract
Overexpression of OsGS gene modulates oxidative stress response in rice after exposure to cadmium stress. Our results describe the features of transformants with enhanced tolerance to Cd and abiotic stresses. Glutamine synthetase (GS) (EC 6.3.1.2) is an enzyme that plays an essential role in the metabolism of nitrogen by catalyzing the condensation of glutamate and ammonia to form glutamine. Exposure of plants to cadmium (Cd) has been reported to decrease GS activity in maize, pea, bean, and rice. To better understand the function of the GS gene under Cd stress in rice, we constructed a recombinant pART vector carrying the GS gene under the control of the CaMV 35S promoter and OCS terminator and transformed using Agrobacterium tumefaciens. We then investigated GS overexpressing rice lines at the physiological and molecular levels under Cd toxicity and abiotic stress conditions. We observed a decrease in GS enzyme activity and mRNA expression among transgenic and wild-type plants subjected to Cd stress. The decrease, however, was significantly lower in the wild type than in the transgenic plants. This was further validated by the high GS mRNA expression and enzyme activity in most of the transgenic lines. Moreover, after 10 days of exposure to Cd stress, increase in the glutamine reductase activity and low or no malondialdehyde contents were observed. These results showed that overexpression of the GS gene in rice modulated the expression of enzymes responsible for membrane peroxidation that may result in plant death.
- Publication
Plant cell reports, 2013, Vol 32, Issue 10, p1521
- ISSN
1432-203X
- Publication type
Journal Article
- DOI
10.1007/s00299-013-1464-8