Abstract
Calmodulin (CaM) is a highly conserved calcium sensor protein associated with chilling tolerance in living organisms. It has four EF-hand domains for binding of four Ca2+, two of them located in the N-terminus, and the other two in the C-terminus. A notothenioid CaM gene fragment (CaMm), which only codes for N-terminus of CaM (with two EF-hand domains), was introduced into Nicotiana benthamiana. Effects of its overexpression on chilling tolerance in plants were explored. During 4◦C or 0◦C chilling treatment, both CaMm and CaM transgenic plants showed higher PSII maximum quantum yield, actual quantum yield, and soluble protein content, lower electrolyte leakage and malondialdehyde content than that of the control. The changes in these physiological indices were comparable between the CaMm and CaM transgenic plants during the treatments. These results indicate that the N-terminus of calmodulin is likely the key functional domain involved in the adaptive response to cold stress.
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Abbreviations
- CaM:
-
calmodulin
- DOT:
-
days of treatment
- EL:
-
electrolyte leakage
- Fo :
-
minimal fluorescence yield of the darkadapted state
- Fo':
-
minimal fluorescence yield of the light-adapted state
- Fm :
-
maximal fluorescence yield of the dark-adapted state
- Fm':
-
maximal fluorescence yield of the light-adapted state
- Fs :
-
steady-state fluorescence yield
- Fv :
-
variable fluorescence
- Fv/Fm :
-
maximum photochemical efficiency of PSII
- FM:
-
fresh mass
- MDA:
-
malondialdehyde
- ROS:
-
reactive oxygen species
- RT-PCR:
-
reverse transcription-PCR
- TBA:
-
thiobarbituric acid
- TCA:
-
trichloroacetic acid
- ФPSII :
-
actual photochemical efficiency of PSII
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Acknowledgments: The valuable help of Prof. Dao-Wen Wang (Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China) and his useful suggestions were gratefully acknowledged. This work was supported by the grants: the 973 program (2010CB126304) from Ministry of Science and Technology of China, the National Natural Science Foundation of China (31570398, 31270287), and the International Collaborative Polar Exploration Grant from CHINARE to Liang-Biao Chen.
These authors contributed equally to this work.
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Zhang, T.J., Pan, L.J., Huang, Q. et al. Overexpression of calmodulin gene fragment from Antarctic notothenioid fish improves chilling tolerance in Nicotiana benthamiana . Photosynthetica 55, 630–637 (2017). https://doi.org/10.1007/s11099-016-0682-z
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DOI: https://doi.org/10.1007/s11099-016-0682-z