Altered shoot/root Na+ distribution and bifurcating salt sensitivity in Arabidopsis by genetic disruption of the Na+ transporter AtHKTI1

作者：Maser P; Eckelman B; Vaidyanathan R; Horie T; Fairbairn DJ; Kubo M; Yamagami M; Yamaguchi K; Nishimura M; Uozumi N; Robertson W; Sussman MR; Schroeder JI^*

来源：FEBS Letters, 2002, 531(2): 157-161.

DOI：10.1016/S0014-5793(02)03488-9

• sodium transport
• salt stress
• T-DNA insertion
• Arabidopsis thaliana

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 athktl/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.

• 出版日期2002-11-6