Abstract
Calcium-dependent protein kinases (CDPKs) are proposed to play an essential role in plant defense responses. In this study, we aimed to define the full sequence of a CDPK gene of Panax ginseng and analyze its expression in roots, leaves, and cell cultures of P. ginseng, one of the most valuable Chinese traditional medicinal herbs. We isolated the full-length cDNA of a P. ginseng CDPK gene, which was designated PgCDPK1a. PgCDPK1a shares high sequence identity at the amino acidic level with previously reported CDPK sequences for other plant species. We analyzed PgCDPK1a expression in the leaves of wild-growing P. ginseng plants, and in the roots and leaves of cultivated P. ginseng plants growing in an open experimental nursery at a natural ginseng habitat. PgCDPK1a was more actively expressed in the young leaves of cultivated P. ginseng plants than in that of wild-growing ones. Finally, we analyzed the expression of the gene in control GV and five rolC and rolB transgenic callus cultures of P. ginseng with different levels of fresh biomass accumulation, pathogen-related gene expression, and ginsenoside production. We observed a strong positive correlation between fresh biomass accumulation of P. ginseng cell cultures and expression of the PgCDPK1a gene. There was a less clear negative correlation between the expression of pathogen-related genes and the content of ginsenosides with the PgCDPK1a expression in cell cultures of P. ginseng. Perhaps, PgCDPK1a is involved in ginseng growth, as a positive regulator.
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Abbreviations
- 4-CPA:
-
p-chlorophenoxyacetic acid
- CDPK:
-
Calcium-dependent protein kinases
- RT-PCR:
-
Reverse transcription polymerase chain reaction
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Acknowledgments
The authors express their thanks to Alexandra Dubrovina for the helpful comments on the manuscript. This work was supported by grants from the Far East Division of the Russian Academy of Sciences, the Grant Program “Molecular and Cell Biology” of the Russian Academy of Sciences, and the Russian Science Support Foundation.
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Kiselev, K.V., Turlenko, A.V. & Zhuravlev, Y.N. Structure and expression profiling of a novel calcium-dependent protein kinase gene PgCDPK1a in roots, leaves, and cell cultures of Panax ginseng . Plant Cell Tiss Organ Cult 103, 197–204 (2010). https://doi.org/10.1007/s11240-010-9767-8
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DOI: https://doi.org/10.1007/s11240-010-9767-8