The Na+ transporter AtHKT1;1 controls retrieval of Na + from the xylem in Arabidopsis

Romola Jane Davenport*, Alicia Muñoz-Mayor, Deepa Jha, Pauline Adobea Essah, Ana Rus, Mark Tester

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

380 Scopus citations


HKT-type transporters appear to play key roles in Na+ accumulation and salt sensitivity in plants. In Arabidopsis HKT1;1 has been proposed to influx Na+ into roots, recirculate Na+ in the phloem and control root : shoot allocation of Na+. We tested these hypotheses using 22Na+ flux measurements and ion accumulation assays in an hkt1;1 mutant and demonstrated that AtHKT1;1 contributes to the control of both root accumulation of Na+ and retrieval of Na+ from the xylem, but is not involved in root influx or recirculation in the phloem. Mathematical modelling indicated that the effects of the hkt1;1 mutation on root accumulation and xylem retrieval were independent. Although AtHKT1;1 has been implicated in regulation of K + transport and the hkt1;1 mutant showed altered net K+ accumulation, 86Rb+ uptake was unaffected by the hkt1;1 mutation. The hkt1;1 mutation has been shown previously to rescue growth of the sos1 mutant on low K+; however, HKT1;1 knockout did not alter K + or 86Rb+ accumulation in sos1.

Original languageEnglish (US)
Pages (from-to)497-507
Number of pages11
JournalPlant, Cell and Environment
Issue number4
StatePublished - Apr 2007
Externally publishedYes


  • HKT1
  • Salinity
  • Salt tolerance
  • Sodium transport

ASJC Scopus subject areas

  • Physiology
  • Plant Science


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