Abstract
We have isolated and characterized a putative rice MAPK gene (designated OsMAPK44) encoding for a protein of 593 amino acids that has the MAPK family signature and phosphorylation activation motif, TDY. Alignment of the predicted amino acid sequences of OsMAPK44 showed high homology with other rice MAPKs. Under normal conditions, the OsMAPK44 gene is highly expressed in root tissues, but relatively less in leaf and stem tissues of the japonica type rice plant (O. sativa L. Donggin). mRNA expression of the gene is highly inducible by salt and drought treatment, but not by cold treatment. Moreover, the mRNA level of the OsMAPK44 is up-regulated by exogenously applied Abscisic acid (ABA) and H2O2. When we compared the OsMAPK44 gene expression level between a salt sensitive indica cultivar (IR64) and a salt resistant indica cultivar (Pokkali), they showed some difference in expression kinetics with the salt treatment. OsMAPK44 gene expression in Pokkali was slightly up-regulated within 30 min and then disappeared rapidly, while IR64 maintained its expression for 1 h following down-regulation. Under the salinity stress, OsMAPK44 overexpression transgenic rice plants showed less damage and greater ratio of potassium and sodium than OsMAPK44 suppressed transgenic lines did, suggesting that OsMAPK44 may have a role to prevent damages due to working for favorable ion balance in the presence of salinity.
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Acknowledgements
This study was financially supported by the Crop Functional Genomics Project of the 21C Frontier Program governed by the Ministry of Science and Technology and Rural Development Administration (RDA), and by the Biogreen21 Program of the RDA.
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Jeong, MJ., Lee, SK., Kim, BG. et al. A rice (Oryza sativa L.) MAP kinase gene, OsMAPK44, is involved in response to abiotic stresses. Plant Cell Tiss Organ Cult 85, 151–160 (2006). https://doi.org/10.1007/s11240-005-9064-0
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DOI: https://doi.org/10.1007/s11240-005-9064-0