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Type: Journal article
Title: The Na+ transporter AtHKT1;1 controls retrieval of Na+ from the xylem in Arabidopsis
Author: Davenport, R.
Munoz-Mayor, A.
Jha, D.
Essah, P.
Rus, A.
Tester, M.
Citation: Plant, Cell and Environment, 2007; 30(4):497-507
Publisher: Blackwell Publishing Ltd
Issue Date: 2007
ISSN: 0140-7791
Statement of
Romola Jane Davenport, Alicia Muñoz-Mayor, Deepa Jha, Pauline Adobea Essah, Ana Rus, Mark Tester
Abstract: 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.
Description: The definitive version may be found at
DOI: 10.1111/j.1365-3040.2007.01637.x
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Appears in Collections:Agriculture, Food and Wine publications
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