Journal
PLANT MOLECULAR BIOLOGY
Volume 75, Issue 1-2, Pages 179-191Publisher
SPRINGER
DOI: 10.1007/s11103-010-9717-1
Keywords
ABA; Calcium-dependent protein kinase; FOX hunting system; Rice (Oryza sativa L.); Salt stress
Categories
Funding
- Japan Society for the Promotion of Science [17780013]
- Program for Promotion of Basic Research Activities for Innovative Biosciences
- Ministry of Agriculture, Forestry and Fisheries of Japan [EF-1004]
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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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