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Plant and Cell Physiology Advance Access originally published online on June 4, 2005
Plant and Cell Physiology 2005 46(8):1428-1432; doi:10.1093/pcp/pci143
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JSPP © 2005

Short Communication

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

Akifumi Sugiyama1,* and Jiro Sekiya

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

* Corresponding author: E-mail, a_sugiyama{at}rish.kyoto-u.ac.jp; Fax. +81-774-38-3623.

Homoglutathione (hGSH), which is present in some leguminous plants, is preferred over GSH in in vitro conjugation of acifluorfen and fomesafen by glutathione S-transferase. 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.

1 Present address: Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji 611-0011 Japan

(Received May 9, 2005; Accepted May 26, 2005)
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