title: Functional characterization of a plasma membrane Na+/H+ antiporter from alkali grass (Puccinellia tenuiflora).
abstract: We have cloned a Na(+)/H(+) antiporter gene (GenBank accession no EF440291, PtNHA1) from Puccinellia tenuiflora (so-called alkali grass in Chinese) roots under NaCl salt stress. Its cDNA is 3775 bp and contains a 3414 bp open reading frame. The amino acid sequences of PtNHA1 show high identities with a putative plasma membrane Na(+)/H(+) antiporter from wheat. PtNHA1 was predicted to contain 11 hypothetical transmembrane domains in the N-terminal part and to localize in the plasma membrane. Genomic DNA gel blot analysis shows that PtNHA1 is a single-copy gene in the alkali grass genome. PtNHA1 is highly expressed in leaves, roots and shoots by RNA gel blot analysis. Furthermore, PtNHA1 gene expression of alkali grass was clearly up-regulated by NaCl salt stress. Overexpression of PtNHA1 in Arabidopsis resulted in enhanced tolerance of transgenic plants to NaCl stress. The ion contents analysis shows that, compared with the wild-type (WT), less Na(+) and more K(+) were accumulated in transgenic plants under NaCl stress. The results indicate that PtNHA1 play an important role in NaCl salt stress. Additionally, compared with the WT, total activities of ascorbate peroxidase (APX) and catalase (CAT), two key reactive oxygen species (ROS) detoxifying enzymes were high in transgenic plants under salt stress, respectively. The transcript levels of two APX genes (Apx1, s/mApx) and two CAT genes (Cat1, Cat2) in transgenic plants were higher than those in WT. This suggests that overexpression of PtNHA1 results in enhanced ROS-scavenging enzymes of transgenic plants under NaCl salt stress.
authors.affiliation: Key Laboratory of Forest Tree Genetics Improvement and Biotechnology, Ministry of Education, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Ru
authors.initials: R
authors.lastname: Yang
authors.forename: Baichen
authors.initials: B
authors.lastname: Wang
authors.forename: Guifeng
authors.initials: G
authors.lastname: Liu
authors.forename: Chuanping
authors.initials: C
authors.lastname: Yang
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000201:enzymology / Q000235:genetics; D060387:Ascorbate Peroxidases / Q000235:genetics / Q000378:metabolism; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism*; D003001:Cloning, Molecular; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant / Q000235:genetics; D030821:Plants, Genetically Modified; D006109:Poaceae / Q000187:drug effects / Q000235:genetics*; D011188:Potassium / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D055049:Salt Tolerance / Q000187:drug effects / Q000235:genetics; D012964:Sodium / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology; D017923:Sodium-Hydrogen Exchangers / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics
chemical_list: D017382:Reactive Oxygen Species; D017923:Sodium-Hydrogen Exchangers; D012965:Sodium Chloride; D012964:Sodium; D060387:Ascorbate Peroxidases; D002374:Catalase; D011188:Potassium