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PLANT PHYSIOLOGY , Vol 112, Issue 3 1185-1190, Copyright © 1996 by American Society of Plant Biologists
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BIOCHEMISTRY AND ENZYMOLOGY |
An Inducible Glutathione S-Transferase in Soybean Hypocotyl Is Localized in the Apoplast
T. Flury, E. Wagner and K. Kreuz
Ciba Crop Protection, Weed Control, Plant Biochemistry, CH-4002 Basel, Switzerland (T.F., K.K.)
Glutathione S-transferases (GSTs) with additional activities as fatty acid
hydroperoxidases were investigated in soybean (Glycine max L.) hypocotyls.
Aside from the GSTs present in total soluble tissue extracts, enzyme
activities and distinct immunoreactive GST polypeptides were also detected
in the intercellular washing fluid. Whereas the intracellular isoenzymes
were both constitutive and inducible, apoplastic GST and glutathione
peroxidase was detectable only in tissues treated with the known GST
inducer 2,3,5-triiodobenzoic acid. Monensin inhibited the induced
accumulation of apoplastic GST but did not affect the intracellular
isoforms. The discovery of apoplastic inducible GST will be discussed in
light of the putative function of these enzymes in plants.
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