The effect of post-hypoxia on roots inSenecio andMyosotis species related to the glutathione system |
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Authors: | Sophia Biemelt Gerd Albrecht Ernst-Manfred Wiedenroth |
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Institution: | 1. Institut für Biologie, Botanik und Biologie-Didaktik, Humboldt-Universit?t zu Berlin, Sp?thstr. 80/81, D-12437, Berlin, Germany
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Abstract: | This paper shows the effect of re-aeration following hypoxic pretreatment on the glutathione system in plants with different flooding tolerance. Re-aeration of hypoxically pretreated roots led to an increase of TBA-rm content indicating an accelerated lipid peroxidation (post-anoxic injury). Re-admission of oxygen resulted in a clear increase in the content of total glutathione in both flooding-intolerant speciesMyosotis arvensis andSenecio jacobaea. Simultaneously, the high ratio between reduced (GSH) and oxidized (GSSG) glutathione decreased in these species upon the onset of re-aeration, while the tolerantMyosotis palustris andSenecio aquaticus showed only little changes in contents of GSH and GSSG. An imbalance in GSH/GSSG ratio reflects oxidative stress. The glutathione reductase (GR) reacted very differently in the investigated genera. The metabolic response to varying oxygen pressure is much stronger in the flooding-intolerant species compared to species naturally growing in wetlands. The present results suggest that glutathione system is an important component in overcoming oxidative stress. |
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