Abstract
Calcium acts as a messenger in various signal transduction pathways in plants. Calcium-dependent protein kinases (CDPKs) play important roles in regulating downstream components in calcium signaling pathways. In rice, the CDPKs constitute a large multigene family consisting of 29 genes, but the biological functions and functional divergence or redundancy of most of these genes remain unclear. Using a mini-scale full-length cDNA overexpressor (FOX) gene hunting system, we generated 250 independent transgenic rice plants overexpressing individual rice CDPKs (CDPK FOX-rice lines). These CDPK FOX-rice lines were screened for salt stress tolerance. The survival rate of the OsCPK21-FOX plants was higher than that of wild-type (WT) plants grown under high salinity conditions. The inhibition of seedling growth by abscisic acid (ABA) treatment was greater in the OsCPK21-FOX plants than in WT plants. Several ABA- and high salinity-inducible genes were more highly expressed in the OsCPK21-FOX plants than in WT plants. These results suggest that OsCPK21 is involved in the positive regulation of the signaling pathways that are involved in the response to ABA and salt stress.
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Abbreviations
- ABA:
-
Abscisic acid
- CaMV:
-
Cauliflower mosaic virus
- Fl-cDNA:
-
Full-length cDNA
- FOX:
-
Full-length cDNA overexpressor
- RT–PCR:
-
Reverse transcription-PCR
- UTR:
-
Untranslated region
- WT:
-
Wild-type
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Acknowledgments
This work was supported by grants from the Japan Society for the Promotion of Science (Grant-in-Aid No. 17780013 for Young Scientists to T.A.), the Program for Promotion of Basic Research Activities for Innovative Biosciences (PROBRAIN to R.O.) and the Ministry of Agriculture, Forestry and Fisheries of Japan (Green Technology Project EF-1004 to H.I.). We thank Shigeko Ando, Hiroko Abe, Machiko Nakazawa and Mariko Kajikawa for their technical assistance, Drs. Manabu Yoshikawa and Sakiko Takahashi for helpful discussions and Dr. Tetsuo Meshi for coordinating the use of experimental facilities. We are grateful to the Rice Genome Resource Center of NIAS in Tsukuba, Japan for providing the rice fl-cDNAs and to the DNA Bank of the NIAS for providing a rice EST clone.
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Asano, T., Hakata, M., Nakamura, H. et al. Functional characterisation of OsCPK21, a calcium-dependent protein kinase that confers salt tolerance in rice. Plant Mol Biol 75, 179–191 (2011). https://doi.org/10.1007/s11103-010-9717-1
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DOI: https://doi.org/10.1007/s11103-010-9717-1