Abstract
Key message
The overexpression of tomato GDP- l -galactose phosphorylase gene enhanced tolerance to chilling stress and reduced photoinhibition of photosystems I and II in transgenic tobacco.
Abstract
Chilling stress is a crucial factor that limits the geographical distribution and yield of chilling-sensitive plants. Ascorbate (AsA) protects plants by scavenging reactive oxygen species and reduces photoinhibition by promoting the conversion of violaxanthin to zeaxanthin in the xanthophyll cycle to dissipate excess excitation energy. Possible mechanisms of AsA for plant photoprotection under chilling stress were investigated by isolating the tomato GDP-l-galactose phosphorylase gene (SlGGP) and producing transgenic tobacco plants with overexpression of SlGGP. The transgenic plants subjected to chilling stress accumulated less H2O2, demonstrated lower levels of ion leakage and malondialdehyde, and acquired higher net photosynthetic rate, higher maximum photochemical efficiency of PSII, and higher D1 protein content compared with the wild-type (WT) plants. The transgenic plants subjected to chilling stress also showed higher GDP-l-galactose phosphorylase activity, increased AsA content as well as ascorbate peroxidase and oxidizable P700 activities than WT plants. Thus, SlGGP overexpression is crucial in promoting AsA synthesis and alleviating photoinhibition of two photosystems.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbate
- DAB:
-
Diaminobenzidin
- DHA:
-
Dehydroascorbate
- ELISA:
-
Enzyme-linked immunosorbent assay
- Fv/Fm:
-
The maximal photochemical efficiency of PSII
- GGP:
-
GDP-l-galactose phosphorylase
- IPTG:
-
Isopropyl β-d-1-thiogalactopyranoside
- NBT:
-
Nitroblue tetrazolium
- PFD:
-
Photon flux density
- Pn:
-
The net photosynthetic rate
- PVDF:
-
Polyvinylidene fluoride
- ROS:
-
Reactive oxygen species
- TBA:
-
Thiobarbituric acid
- WT:
-
Wild type
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Acknowledgments
This research was supported by the Natural Science Foundation of China (31171474, 31371553), Science and technology project of higher education of Shandong Province (J13LE12), Natural Science Foundation of Shandong Province, China (ZR2013CL006).
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The authors declare that they have no conflict of interest.
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Communicated by K. Toriyama.
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Wang, L., Meng, X., Yang, D. et al. Overexpression of tomato GDP-l-galactose phosphorylase gene in tobacco improves tolerance to chilling stress. Plant Cell Rep 33, 1441–1451 (2014). https://doi.org/10.1007/s00299-014-1627-2
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DOI: https://doi.org/10.1007/s00299-014-1627-2