Altered shoot/root Na+ distribution and bifurcating salt sensitivity in Arabidopsis by genetic disruption of the Na+ transporter AtHKT1

FEBS Letters

Yamaguchi, Katsushi⁴  Horie, Tomoaki⁶  Uozumi, Nobuyuki³  Fairbairn, David J²  Vaidyanathan, Rama⁶  Eckelman, Brendan⁶  Sussman, Michael R⁵  Robertson, Whitney⁵  Schroeder, Julian I⁶  Nishimura, Mikio⁴  Yamagami, Mutsumi¹  Mäser, Pascal⁶  Kubo, Masahiro³ 

[1] Institute of Environmental Sciences, Aomori 039-3212, Japan;Department of Botany, University of Queensland, St. Lucia, Qld 4072, Australia;Bioscience Center, Nagoya University, Nagoya 464-8601, Japan;Department of Cell Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan;Biotechnology Center, University of Wisconsin, Madison, WI 53706, USA;Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0116, USA

关键词: Sodium transport;    Salt stress;    T-DNA insertion;    Arabidopsis thaliana;   

DOI  :  10.1016/S0014-5793(02)03488-9

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

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.

【 授权许可】

Unknown