Journal Article

Localized Expression of Arbuscular Mycorrhiza-Inducible Ammonium Transporters in Soybean

Yoshihiro Kobae, Yosuke Tamura, Shoko Takai, Mari Banba and Shingo Hata

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 9, pages 1411-1415
Published in print September 2010 | ISSN: 0032-0781
Published online July 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq099
Localized Expression of Arbuscular Mycorrhiza-Inducible Ammonium Transporters in Soybean

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The majority of land plants acquire soil nutrients, such as phosphorus and nitrogen, not only through the root surface but also through arbuscular mycorrhizal (AM) fungi. Soybean is the most important leguminous crop in the world. We found 16 ammonium transporter genes in the soybean genome, five of which are AM inducible. Among them, promoter–reporter analysis indicated that the most abundantly transcribed gene, GmAMT4.1, showed specific expression in arbusculated cortical cells. Moreover, the GmAMT4.1–green fluorescent protein fusion was localized on the branch domain of periarbuscular membranes but not on the trunk region, indicating that active ammonium transfer occurs around the arbuscule branches.

Keywords: Ammonium transporter; Arbuscular mycorrhiza; Glycine max; Symbiosis

Journal Article.  2709 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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