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Altered shoot/root Na + distribution and bifurcating salt sensitivity in Arabidopsis by genetic disruption of the Na + transporter AtHKT1
Author(s) -
Mäser Pascal,
Eckelman Brendan,
Vaidyanathan Rama,
Horie Tomoaki,
Fairbairn David J,
Kubo Masahiro,
Yamagami Mutsumi,
Yamaguchi Katsushi,
Nishimura Mikio,
Uozumi Nobuyuki,
Robertson Whitney,
Sussman Michael R,
Schroeder Julian I
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)03488-9
Subject(s) - shoot , arabidopsis , stele , sodium , transporter , salt (chemistry) , chemistry , botany , biology , mutant , biochemistry , gene , organic chemistry
Sodium (Na + ) is toxic to most plants, but the molecular mechanisms of plant Na + uptake and distribution remain largely unknown. Here we analyze Arabidopsis lines disrupted in the Na + transporter AtHKT1 . AtHKT1 is expressed in the root stele and leaf vasculature. athkt1 null plants exhibit lower root Na + levels and are more salt resistant than wild‐type in short‐term root growth assays. In shoot tissues, however, athkt1 disruption produces higher Na + levels, and athkt1 and athkt1 / sos3 shoots are Na + ‐hypersensitive in long‐term growth assays. Thus wild‐type AtHKT1 controls root/shoot Na + distribution and counteracts salt stress in leaves by reducing leaf Na + accumulation.