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https://hdl.handle.net/2440/44446
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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 1365-3040 |
Statement of Responsibility: | 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 www.blackwell-synergy.com |
DOI: | 10.1111/j.1365-3040.2007.01637.x |
Published version: | http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-3040.2007.01637.x |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 6 |
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