Induction of pumpkin glutathione S-transferases by different stresses and its possible mechanisms
2006
Hossain, M.Z.(Kagawa Univ., Miki-cho (Japan). Dept. of Plant Sciences) | Hossain, M.D.(Kagawa Univ., Miki-cho (Japan). Dept. of Plant Sciences) | Fujita, M.(Kagawa Univ., Miki-cho (Japan). Dept. of Plant Sciences) E-mail:[email protected]
Induction of pumpkin glutathione S-transferases (GSTs) by different stresses and endogenous trans-2-hexenal content were determined in search of a common signal for GST induction. All of the stresses showed significant induction, As2O3 causing the highest induction followed by trans-2-hexenal. The trans-2-hexenal content was highest in trans-2-hexenal-treated seedlings and next-highest in methyl jasmonate-treated seedlings, whereas high temperature- and As2O3-treated seedlings had trans-2-hexenal contents lower than that of control seedlings. All four stresses showed weak lipoxygenase induction. Both antioxidants or oxidants induced GST to different degrees. The reduced glutathione : oxidized glutathione ratio was the lowest in oxidized glutathione treated-seedlings. The results suggest that pumpkin GSTs are not induced through a common signalling pathway and that redox perturbation plays a role in GST induction.
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