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Plant and Cell Physiology Advance Access published online on March 15, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci083
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 6, 2005
Accepted March 2, 2005

Short Communication

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

Mineo Yamaguchi 1, Takayuki Sasaki 1, Mayandi Sivaguru 1, Yoko Yamamoto 1, Hiroki Osawa 1, Sung Ju Ahn 1, and Hideaki Matsumoto 1*

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

* To whom correspondence should be addressed.
Hideaki Matsumoto, E-mail: hmatsumo{at}rib.okayama-u.ac.jp


  Abstract

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 first direct evidence that ALMT1 is localized in plasma membrane of Al-tolerant wheat. Phase partitioning experiments showed that this transporter was associated with the plasma membrane fraction. ALMT1 was detected in 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.

Keywords: Aluminum stress; Aluminum-activated malate transporter; Plasma membrane; green fluorescent protein; Triticum aestivum L.
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