Abstract
Homozygous transgenic cotton (Gossypium hirsutum L.) plants that accumulated glycinebetaine (GB) in larger quantities were more tolerant to salt than wild-type (WT) plants. Four transgenic lines, namely 1, 3, 4, and 5, accumulated significantly higher levels of GB than WT plants did both before and after salt stress. At 175 and 275 mM NaCl, seeds of all the transgenic lines germinated earlier and recorded a higher final germination percentage, and the seedlings grew better, than those of the WT. Under salt stress, all the lines showed some characteristic features of salt tolerance, such as higher leaf relative water content (RWC), higher photosynthesis, better osmotic adjustment (OA), lower percentage of ion leakage, and lower peroxidation of the lipid membrane. Levels of endogenous GB in the transgenic plants were positively correlated with RWC and OA. The results indicate that GB in transgenic cotton plants not only maintains the integrity of cell membranes but also alleviates osmotic stress caused by high salinity. Lastly, the seed cotton yield of transgenic lines 4 and 5 was significantly higher than that of WT plants in saline soil. This research indicates that betA gene has the potential to improve crop’s salt tolerance in areas where salinity is limiting factors for agricultural productivity.
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Abbreviations
- BADH:
-
Betaine aldehyde dehydrogenase
- CDH:
-
Choline dehydrogenase
- CMO:
-
Choline monooxygenase
- GB:
-
Glycinebetaine
- MDA:
-
Malondialdehyde
- OA:
-
Osmotic adjustment
- ROS:
-
Reactive oxygen species
- RWC:
-
Relative water content
- SOD:
-
Superoxide dismutase
- WT:
-
Wild-type
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Acknowledgments
This research was supported by the National Project for Transgenic Plant Research and Industrialization of China (2008ZX08005-4) and Scientific and technological project in Shandong Province (2009GG10009010) and Cotton Improved Variety Project of Shandong Province (2007LZ003). We would also like to thank International Science Editing for assistance in language editing of the manuscript.
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Zhang, K., Guo, N., Lian, L. et al. Improved salt tolerance and seed cotton yield in cotton (Gossypium hirsutum L.) by transformation with betA gene for glycinebetaine synthesis. Euphytica 181, 1–16 (2011). https://doi.org/10.1007/s10681-011-0354-9
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DOI: https://doi.org/10.1007/s10681-011-0354-9