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Plant and Cell Physiology Advance Access originally published online on September 16, 2006
Plant and Cell Physiology 2006 47(10):1437-1441; doi:10.1093/pcp/pcl010
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Repression of Nitrate Uptake by Replacement of Asp105 by Asparagine in AtNRT3.1 in Arabidopsis thaliana L.

Tahei Kawachi*, Yoshihito Sunaga, Munehiro Ebato, Tetsuya Hatanaka and Hisatomi Harada1

National Institute of Livestock and Grassland Science, 768, Senbonmatsu, Nasushiobara, Tochigi, 329-2793 Japan

* Corresponding author: E-mail, tahei{at}affrc.go.jp; Fax, +81-287-36-6629.

An Arabidopsis mutant (rnc1) with a mutation at the 313th nucleotide from the translational start site of AtNRT3.1 was isolated. The mutation resulted in the replacement of aspartate by asparagine at the 105th amino acid in a region conserved among higher plants. In the rnc1 mutant, both the nitrate concentrations in plants and the nitrate uptake from the medium were <13% compared with those of the wild type, while AtNRT3.1 mRNA was accumulated similarly and both AtNRT1.1 and AtNRT2.1 mRNA were decreased. These results suggest that the replacement of Asp105 in AtNRT3.1 markedly reduces nitrate uptake and accumulation.

1 Present address: Ogata farm, Agricultural Experiment Station, Akita Prefectural Agriculture, Forestry and Fisheries Research Center, Higashi 1-1, Ogata, Minami-Akita, Akita, 010-0442 Japan.

(Received July 18, 2006; Accepted September 12, 2006)
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