title: Analysis of expressed sequence tags from a NaHCO(3)-treated alkali-tolerant plant, Chloris virgata.
abstract: Chloris virgata Swartz (C. virgata) is a gramineous wild plant that can survive in saline-alkali areas in northeast China. To examine the tolerance mechanisms of C. virgata, we constructed a cDNA library from whole plants of C. virgata that had been treated with 100 mM NaHCO(3) for 24 h and sequenced 3168 randomly selected clones. Most (2590) of the expressed sequence tags (ESTs) showed significant similarity to sequences in the NCBI database. Of the 2590 genes, 1893 were unique. Gene Ontology (GO) Slim annotations were obtained for 1081 ESTs by BLAST2GO and it was found that 75 genes of them were annotated with GO terms "response to stress", "response to abiotic stimulus", and "response to biotic stimulus", indicating these genes were likely to function in tolerance mechanism of C. virgata. In a separate experiment, 24 genes that are known from previous studies to be associated with abiotic stress tolerance were further examined by real-time RT-PCR to see how their expressions were affected by NaHCO(3) stress. NaHCO(3) treatment up-regulated the expressions of pathogenesis-related gene (DC998527), Win1 precursor gene (DC998617), catalase gene (DC999385), ribosome inactivating protein 1 (DC999555), Na(+)/H(+) antiporter gene (DC998043), and two-component regulator gene (DC998236).
authors.affiliation: Laboratory of Environmental Stress Tolerance Mechanisms, Asian Natural Environmental Science Center (ANESC), The University of Tokyo, 1-1-1, Midori-cho, Nishitokyo-shi, Tokyo 188-0002, Japan.
authors.forename: Shunsaku
authors.initials: S
authors.lastname: Nishiuchi
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Fujihara
authors.forename: Shenkui
authors.initials: S
authors.lastname: Liu
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Takano
mesh_terms: D003001:Cloning, Molecular; D020224:Expressed Sequence Tags; D015870:Gene Expression / Q000187:drug effects; D018506:Gene Expression Regulation, Plant; D015723:Gene Library; D017343:Genes, Plant; D006109:Poaceae / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055049:Salt Tolerance / Q000235:genetics*; D055051:Salt-Tolerant Plants / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017693:Sodium Bicarbonate / Q000494:pharmacology*; D013312:Stress, Physiological / Q000235:genetics; D015854:Up-Regulation
chemical_list: D017693:Sodium Bicarbonate