Abstract
The role of superoxide dismutase (SOD) in organismal stress conditions has been widely reported. However, little is known concerning the function of superoxide dismutase in Puccinellia tenuiflora (Turcz.) Scribn. et Merr. In this study, PutCu/Zn-SOD, a cDNA clone that encodes a copper–zinc superoxide dismutase gene, was derived from a cDNA library of P. tenuiflora treated with NaHCO3. Nucleotide sequence analysis revealed that the PutCu/Zn-SOD gene cDNA clone consisted of 615 bp encoding a protein with 204 amino acids. In transformed Arabidopsis protoplasts, a PutCu/Zn-SOD protein was located in the chloroplasts as revealed by a green fluorescent protein. Real-time quantitative PCR expression analysis revealed that the PutCu/Zn-SOD gene was expressed in leaves and roots. PutCu/Zn-SOD gene expression was inducible by 60 mM NaHCO3, 150 mM NaCl, and 1.8 mM H2O2. The differential mRNA expression of PutCu/Zn-SOD was observed for leaves and roots exposed to salinity, alkalinity or oxidative stress. The overexpression of PutCu/Zn-SOD gene in transgenic yeast and Arabidopsis plants increased resistance to multiple abiotic stresses. Transgenic Arabidopsis seedlings exhibited elevated total SOD activity. This study suggested that PutCu/Zn-SOD gene can play an important role in multiple stress.
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