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Plant and Cell Physiology Advance Access published online on June 4, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci143
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received May 9, 2005
Accepted May 26, 2005

Short Communication

Homoglutathione Confers Tolerance to Acifluorfen in Transgenic Tobacco Plants Expressing Soybean Homoglutathione Synthetase

Akifumi Sugiyama 1* and Jiro Sekiya 1

1 Plant Nutrition Laboratory, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan

* To whom correspondence should be addressed.
Akifumi Sugiyama, E-mail: a_sugiyama{at}rish.kyoto-u.ac.jp


  Abstract

Homoglutathione (hGSH), which is present in some leguminous plants, is preferred over GSH in in vitro conjugation with acifluorfen and fomesafen by glutathione S-transferase [Skipsey et al. (1997) FEBS Lett. 409: 370-374]. To investigate the function of hGSH in in vivo detoxification of xenobiotics, we evaluated herbicide tolerance of transgenic tobacco plants expressing soybean homoglutathione synthetase in the cytosol or chloroplasts. Transgenic plants synthesizing hGSH in the cytosol were more tolerant to acifluorfen than wild-type plants, whereas enhanced tolerance to fomesafen was not observed. Transgenic plants synthesizing hGSH in the chloroplasts showed no enhanced tolerance to acifluorfen or fomesafen.

Keywords: acifluorfen; glutathione; glutathione S-transferase; herbicide tolerance; homoglutathione; transgenic tobacco.
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