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Plant and Cell Physiology Advance Access originally published online on March 15, 2005
Plant and Cell Physiology 2005 46(5):812-816; doi:10.1093/pcp/pci083
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JSPP © 2005

Short Communication

Evidence for the Plasma Membrane Localization of Al-activated Malate Transporter (ALMT1)

Mineo Yamaguchi1, Takayuki Sasaki, Mayandi Sivaguru2, Yoko Yamamoto, Hiroki Osawa3, Sung Ju Ahn4 and Hideaki Matsumoto5

Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Japan

5 Corresponding author: E-mail, hmatsumo{at}rib.okayama-u.ac.jp; Fax, +81-86-434-1210.

Aluminum (Al)-activated malate transporter (ALMT1) was recently identified from wheat (Triticum aestivum). Heterologous expression of ALMT1 led to higher malate exudation that is associated with enhanced Al tolerance in transgenic plants. Here, we show the first direct evidence that ALMT1 is localized in the plasma membrane of Al-tolerant wheat. Phase partitioning experiments showed that this transporter was associated with the plasma membrane fraction. ALMT1 was detected in an Al-tolerant wheat line even without Al treatments. Analysis of transient expression of ALMT1::green fluorescent protein (GFP) in onion and tobacco cells further confirmed this ALMT1 localization.

1 Present address: Department of Agronomy, 1-87 Agriculture Building, University of Missouri, Columbia, MO 65211, USA.

2 Present address: Molecular Cytology Core, 120 Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.

3 Present address: Department of Plant Microbiology and Pathology, Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.

4 Present address: Division of Applied Plant Science, College of Agriculture and Life Sciences, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757 Korea.

(Received February 6, 2005; Accepted March 2, 2005 )
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