Plant and Cell Physiology, 2003, Vol. 44, No. 2 206-211
© 2003 Oxford University Press
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Constitutive Expression of a Novel-Type Ammonium Transporter OsAMT2 in Rice Plants
1 Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan
2 Graduate School of Science, Hokkaido University, Kita 10-Nishi 8, Sapporo, 060-0810 Japan
3 Institut für Pflanzenernährung, Universität Hohenheim, D-70593 Stuttgart, Germany
4 Plant Science Center, RIKEN, 1-7-22 Suehiro, Tsurumi-ku, Yokohama, 230-0045 Japan
Abstract
To characterize ammonium transport pathways in rice, two cDNAs with high homology to MEP/AMT2-type ammonium transporters, OsAMT2;1 and OsAMT3;1, were isolated. Expression of OsAMT2;1 in an ammonium-uptake-defective yeast mutant showed that this gene encodes functional ammonium transporters. OsAMT2;1 was constitutively expressed in both roots and shoots irrespective of the supply of inorganic nitrogen to the medium, whereas OsAMT3;1 expression was relatively weak. A database search with the amino acid sequence of OsAMT2;1 showed that there are 10 putative OsAMT genes in rice, i.e. three each for OsAMT1, OsAMT2 and OsAMT3, respectively, and one for OsAMT4.
Footnotes
5 Corresponding author: E-mail, tyamaya{at}biochem.tohoku.ac.jp; Fax, +81-22-717-8787.
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