title: Cold-specific and light-stimulated expression of a wheat (Triticum aestivum L.) Cor gene Wcor15 encoding a chloroplast-targeted protein.
abstract: Wcor15, a member of the wheat cold-responsive (Cor) gene family, has been isolated and characterized. The deduced polypeptide WCOR15 (MW=14.7 kDa) showed high homology to the previously identified wheat and barley COR proteins. Southern blot analysis using diploid, tetraploid and hexaploid wheat and diploid Aegilops species showed that the wheat and related wild genomes possessed multiple copies of Wcor15 homologues. Five copies were assigned to the homologous group 2 chromosomes by nulli-tetrasomic analysis. Northern blot analysis showed that expression of Wcor15 was specifically induced by low-temperature. Homologous transcripts accumulated in leaves, and light markedly increased their steady-state levels. Bombardment-mediated transient expression analysis of a chimeric CaMV 35S::Wcor15-GFP construct showed protein-targeting to epidermal guard cell chloroplasts in excised spiderwort leaves. A promoter of Wcor15 contained at least three CRT/DRE-like sequence motifs found in Arabidopsis Cor genes and induced the reporter GUS gene expression in leaves of transgenic tobacco plants under low-temperature and light conditions. These results suggest that the functional Cor gene system involving the CRT/DRE cis-element is conserved in both monocotyledonous and dicotyledonous plants.
authors.affiliation: Laboratory of Plant Genetics, Department of Biological and Environmental Science, Faculty of Agriculture and Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Takumi
authors.forename: A
authors.initials: A
authors.lastname: Koike
authors.forename: M
authors.initials: M
authors.lastname: Nakata
authors.forename: S
authors.initials: S
authors.lastname: Kume
authors.forename: R
authors.initials: R
authors.lastname: Ohno
authors.forename: C
authors.initials: C
authors.lastname: Nakamura
mesh_terms: D000595:Amino Acid Sequence; D002736:Chloroplasts / Q000378:metabolism*; D003001:Cloning, Molecular; D003080:Cold Temperature; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D003681:Dehydration; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000528:radiation effects; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D008027:Light; D008969:Molecular Sequence Data; D010937:Plant Growth Regulators / Q000494:pharmacology; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014908:Triticum / Q000235:genetics* / Q000378:metabolism
chemical_list: C095314:COR14 protein, Triticum aestivum; D018076:DNA, Complementary; D018744:DNA, Plant; D006360:Heat-Shock Proteins; D010937:Plant Growth Regulators; D010940:Plant Proteins