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JXB Advance Access published online on February 17, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erj081
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Published by Oxford University Press [2006] on behalf of the Society for Experimental Biology. The online version of this article has been published under an Open Access model. Users are entitled to use, reproduce, disseminate, or display the Open Access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Society for Experimental Biology are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact: journals.permissions@oxfordjournals.org
Received May 11, 2005
Accepted December 1, 2005

RESEARCH PAPER

Genetic mapping of natural variation in potassium concentrations in shoots of Arabidopsis thaliana

Hisatomi Harada 1 * and Roger A. Leigh 2

1 National Institute of Livestock and Grassland Science, 768 Senbonmatsu, Nasushiobara, Tochigh, 329-2793, Japan
2 Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK

* To whom correspondence should be addressed.
Hisatomi Harada, E-mail: hisatomi{at}affrc.go.jp


  Abstract

Naturally-occurring variation in K+ concentrations between plant genotypes is potentially exploitable in a number of ways, including altering the relationship between K+ accumulation and growth, enhancing salinity resistance, or improving forage quality. However, achieving these requires greater insight into the genetic basis of the variation in tissue K+ concentrations. To this end, K+ concentrations were measured in the shoots of 70 Arabidopsis thaliana accessions and a Cape Verdi Island/Landsberg erecta recombinant inbred line (RIL) population. The shoot K+ concentrations expressed on the basis of fresh matter (KFM) or dry matter (KDM) were both broadly and normally distributed as was the shoot dry matter content per unit fresh weight (DMC). Using the data from the RILs, four quantitative trait loci (QTL) were identified for KFM and three for KDM. These were located on chromosomes 2, 3, 4, and 5. Two of the QTLs for KFM overlapped with those for KDM. None of these QTLs overlapped with those for fresh weight or dry weight, but the QTL for KDM located on chromosome 3 overlapped with one for DMC. In silico analysis was used to identify known or putative K+ and cation transporter genes whose loci overlapped with the QTLs. In most cases, multiple genes were identified and the possible role of their gene products in determining shoot K+ concentrations is discussed.

Keywords: Accession; Arabidopsis; mapping; naturally-occurring variation; potassium; quantitative trait loci.
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