Type-B response regulators ARR1 and ARR12 regulate expression of AtHKT1;1 and accumulation of sodium in Arabidopsis shoots

Mason, Michael G., Jha, Deepa, Salt, David E., Tester, Mark, Hill, Kristine, Kieber, Joseph J. and Schaller, G. Eric (2010) Type-B response regulators ARR1 and ARR12 regulate expression of AtHKT1;1 and accumulation of sodium in Arabidopsis shoots. Plant Journal, 64 5: 753-763. doi:10.1111/j.1365-313X.2010.04366.x


Author Mason, Michael G.
Jha, Deepa
Salt, David E.
Tester, Mark
Hill, Kristine
Kieber, Joseph J.
Schaller, G. Eric
Title Type-B response regulators ARR1 and ARR12 regulate expression of AtHKT1;1 and accumulation of sodium in Arabidopsis shoots
Formatted title
Type-B response regulators ARR1 and ARR12 regulate expression of AtHKT1;1 and accumulation of sodium in Arabidopsis shoots
Journal name Plant Journal   Check publisher's open access policy
ISSN 0960-7412
1365-313X
Publication date 2010-12
Sub-type Article (original research)
DOI 10.1111/j.1365-313X.2010.04366.x
Volume 64
Issue 5
Start page 753
End page 763
Total pages 11
Place of publication Oxford, United Kingdom
Publisher BIOS Publishers
Collection year 2011
Language eng
Formatted abstract
Soil salinity affects a large proportion of the land worldwide, forcing plants to evolve a number of mechanisms to cope with salt stress. Cytokinin plays a role in the plant response to salt stress, but little is known about the mechanism by which cytokinin controls this process. We used a molecular genetics approach to examine the influence of cytokinin on sodium accumulation and salt sensitivity in Arabidopsis thaliana. Cytokinin application was found to increase sodium accumulation in the shoots of Arabidopsis, but had no significant affect on the sodium content in the roots. Consistent with this, altered sodium accumulation phenotypes were observed in mutants of each gene class of the cytokinin signal transduction pathway, including receptors, phospho-transfer proteins, and type-A and type-B response regulators. Expression of the gene encoding Arabidopsis high-affinity K+ transporter 1;1 (AtHKT1;1), a gene responsible for removing sodium ions from the root xylem, was repressed by cytokinin treatment, but showed significantly elevated expression in the cytokinin response double mutant arr1-3 arr12-1. Our data suggest that cytokinin, acting through the transcription factors ARR1 and ARR12, regulates sodium accumulation in the shoots by controlling the expression of AtHKT1;1 in the roots. The Plant Journal © 2010 Blackwell Publishing Ltd.
Keyword Cytokinin
Sodium accumulation
AtHKT1
Ion transport
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
 
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Created: Sun, 02 Jan 2011, 00:07:28 EST