title: Localized expression of arbuscular mycorrhiza-inducible ammonium transporters in soybean.
abstract: The majority of land plants acquire soil nutrients, such as phosphorus and nitrogen, not only through the root surface but also through arbuscular mycorrhizal (AM) fungi. Soybean is the most important leguminous crop in the world. We found 16 ammonium transporter genes in the soybean genome, five of which are AM inducible. Among them, promoter-reporter analysis indicated that the most abundantly transcribed gene, GmAMT4.1, showed specific expression in arbusculated cortical cells. Moreover, the GmAMT4.1-green fluorescent protein fusion was localized on the branch domain of periarbuscular membranes but not on the trunk region, indicating that active ammonium transfer occurs around the arbuscule branches.
authors.affiliation: Laboratory of Crop Science, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kobae
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Tamura
authors.forename: Shoko
authors.initials: S
authors.lastname: Takai
authors.forename: Mari
authors.initials: M
authors.lastname: Banba
authors.forename: Shingo
authors.initials: S
authors.lastname: Hata
mesh_terms: D027682:Cation Transport Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D038821:Mycorrhizae / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism / Q000382:microbiology; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism / Q000382:microbiology; D011401:Promoter Regions, Genetic; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D013025:Glycine max / Q000235:genetics* / Q000378:metabolism / Q000382:microbiology; D013559:Symbiosis
chemical_list: D027682:Cation Transport Proteins; D010940:Plant Proteins; D000644:Quaternary Ammonium Compounds; C088952:ammonium transporters, plant