title: Short day length-induced decrease of cesium uptake without altering potassium uptake manner in poplar.
abstract: Short day length-induced alteration of potassium (K) localization in perennial trees is believed to be a mechanism for surviving and adapting to severe winters. To investigate the relationship between cesium (Cs) and K localizations, a model tree poplar, hybrid aspen T89, was employed. Under short day length conditions, the amount of137Cs absorbed through the root and translocated to the root was drastically reduced, but42K was not. Potassium uptake from the rhizosphere is mediated mainly by KUP/HAK/KT and CNGC transporters. In poplar, however, these genes were constantly expressed under short-day conditions except for a slight increase in the expression a KUP/HAK/KT gene six weeks after the onset of the short-day treatment. These results indicated that the suppression of137Cs uptake was triggered by short day length but not regulated by competitive Cs+and K+transport. We hypothesize that there are separately regulated Cs+and K+transport systems in poplar.
authors.affiliation: Graduate school of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Noda
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.|Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tsukuba 305-8577, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Furukawa
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Aohara
authors.affiliation: Graduate school of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Nihei
authors.affiliation: Graduate school of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hirose
authors.affiliation: Graduate school of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.|PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, 332-0012, Japan.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Tanoi
authors.affiliation: Graduate school of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Tomoko M
authors.initials: TM
authors.lastname: Nakanishi
authors.affiliation: Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
authors.forename: Shinobu
authors.initials: S
authors.lastname: Satoh
mesh_terms: D001692:Biological Transport / Q000528:radiation effects; D027682:Cation Transport Proteins / Q000235:genetics* / Q000378:metabolism; D002586:Cesium / Q000378:metabolism*; D002678:Chimera; D018506:Gene Expression Regulation, Plant; D017136:Ion Transport; D008027:Light; D017440:Photoperiod; D018515:Plant Leaves / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D018547:Plant Stems / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D032107:Populus / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D011188:Potassium / Q000378:metabolism*
chemical_list: D027682:Cation Transport Proteins; D010940:Plant Proteins; D002586:Cesium; D011188:Potassium