Journal
PLANT MOLECULAR BIOLOGY REPORTER
Volume 32, Issue 3, Pages 732-739Publisher
SPRINGER
DOI: 10.1007/s11105-013-0683-z
Keywords
bZIP transcription factor; Abiotic stress; Transient transformation system; Homologous overexpression; RNAi-silenced; Tamarix hispida
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Funding
- Chinese Academy of Sciences
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200973]
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In this study, we developed a simple and efficient transient transformation system, which can be used in homologous expression or reverse genetic study of the plants. A system for characterizing gene function in response to stress tolerance was also developed based on this transformation method. The overexpression and RNAi-silencing of a bZIP gene from Tamarix hispida, ThbZIP1, were performed in T. hispida using this transformation method. Real-time PCR showed that the expression of ThbZIP1 was highly up- and down-regulated in the plants with overexpression and RNAi-silenced expression of ThbZIP1, respectively, when compared with control plants (transiently transformed with empty pROK2). A physiological study showed that ThbZIP1 can enhance the activities of both peroxidase (POD) and superoxide dismutase (SOD), and decrease electrolyte leakage rate and levels of reactive oxygen species (ROS) and malondialdehyde (MDA) under salt stress conditions. Furthermore, ThbZIP1 is found to mediate stress tolerance by regulating the expression of SOD and POD genes. These results suggested that this transient transformation system is an effective method for determining the function of a gene in response to abiotic stress in plants.
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