Abstract
To clarify the mechanisms of stress tolerance in rice and to search for rice genes associated with these mechanisms, we analyzed genes induced by a high salinity treatment using the PCR-subtractive hybridization method (PCR-subtraction). Seedlings of the salt-tolerant rice cultivar Dee-geo-woo-gen (DGWG) were either treated with 250 mM NaCl for 5 h or left untreated, and PCR-subtraction was then performed using the untreated (control) plants as a driver and the NaCl-treated plants as a tester. We obtained 384 clones of tester-specific cDNAs as salt-inducible candidates. Northern analysis performed with the cDNA fragments showed that 65 clones had been induced by the NaCl treatment. Sequence analysis and database searching indicated that these clones have homology to proteins functional for detoxification, stress response, and signal transduction in plants. Of these clones, 22% coded for unknown proteins and 12% gave no hits. We selected eight clones from each functional category and analyzed their expression pattern in DGWG. For temporal analysis, seedlings were treated with H2O or 250 mM NaCl for 0, 0.5, 1, 2, 5, 10 or 24 h. Different patterns of transcript regulation were found. For the analysis of expression in response to various types of stress and abscisic acid (ABA) treatments, seedlings were treated for 5 h or 10 h with H2O, dehydration, cold (4°C), heat (40°C), mannitol, ABA, or wounding. All clones were strongly up-regulated by osmotic stress (dehydration and mannitol) and the ABA treatment.
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This work was supported by a project grant of the Bio-oriented Technology Research Advancement Institution (BRAIN).
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Shiozaki, N., Yamada, M. & Yoshiba, Y. Analysis of salt-stress-inducible ESTs isolated by PCR-subtraction in salt-tolerant rice. Theor Appl Genet 110, 1177–1186 (2005). https://doi.org/10.1007/s00122-005-1931-x
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DOI: https://doi.org/10.1007/s00122-005-1931-x