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Significant improvement of stress tolerance in tobacco plants by overexpressing a stress-responsive aldehyde dehydrogenase gene from maize (Zea mays)

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Abstract

Aldehyde dehydrogenases (ALDHs) play a central role in detoxification processes of aldehydes generated in plants when exposed to the stressed conditions. In order to identify genes required for the stresses responses in the grass crop Zea mays, an ALDH (ZmALDH22A1) gene was isolated and characterized. ZmALDH22A1 belongs to the family ALDH22 that is currently known only in plants. The ZmALDH22A1 encodes a protein of 593 amino acids that shares high identity with the orthologs from Saccharum officinarum (95%), Oryza sativa (89%), Triticum aestivum (87%) and Arabidopsis thaliana (77%), respectively. Real-time PCR analysis indicates that ZmALDH22A1 is expressed differentially in different tissues. Various elevated levels of ZmALDH22A1 expression have been detected when the seedling roots exposed to abiotic stresses including dehydration, high salinity and abscisic acid (ABA). Tomato stable transformation of construct expressing the ZmALDH22A1 signal peptide fused with yellow fluorescent protein (YFP) driven by the CaMV35S-promoter reveals that the fusion protein is targeted to plastid. Transgenic tobacco plants overexpressing ZmALDH22A1 shows elevated stresses tolerance. Stresses tolerance in transgenic plants is accompanied by a reduction of malondialdehyde (MDA) derived from cellular lipid peroxidation.

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Acknowledgements

We thank Dr. Hongquan Yang from Shanghai Jiaotong University for kindly providing us with pHB vector. This work was supported by the Natural Science Foundation of China (Grant nos. 30770466 & 90717110), biotechnology application projects (Grant nos. 2006Z-05-0039 and 07KJT-11) from the local government of Sichuan Province, and 985 youth talent program (Grant No. 0082204127106) from Sichuan University.

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Correspondence to Yongsheng Liu.

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The authors Weizao Huang, Xinrong Ma, and Qilin Wang contributed equally to this work.

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Huang, W., Ma, X., Wang, Q. et al. Significant improvement of stress tolerance in tobacco plants by overexpressing a stress-responsive aldehyde dehydrogenase gene from maize (Zea mays). Plant Mol Biol 68, 451–463 (2008). https://doi.org/10.1007/s11103-008-9382-9

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  • DOI: https://doi.org/10.1007/s11103-008-9382-9

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