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Intracellular adaptations of glutathione content in Cucurbita pepo L. induced by treatment with reduced glutathione and buthionine sulfoximine

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Summary.

The intracellular effects of GSH (reduced glutathione) and BSO (buthionine sulfoximine) treatment on glutathione content were investigated with immunogold labeling in individual cellular compartments of Cucurbita pepo L. seedlings. Generally, GSH treatment led to increased levels of glutathione in roots and leaves (up to 3.5-fold in nuclei), whereas BSO treatment significantly decreased glutathione content in all organs. Transmission electron microscopy revealed that glutathione levels in mitochondria, which showed the highest glutathione labeling density of all compartments, remained generally unaffected by both treatments. Since glutathione within mitochondria is involved in the regulation of cell death, these results indicate that high and stable levels of glutathione in mitochondria play an important role in cell survival strategies. BSO treatment significantly decreased glutathione levels (1) in roots by about 78% in plastids and 60.8% in the cytosol and (2) in cotyledons by about 55% in the cytosol and 38.6% in plastids. After a short recovery period, glutathione levels were significantly increased in plastids and the cytosol of root tip cells (up to 3.7-fold) and back to control values in cotyledons. These results indicate that plastids, either alone or together with the cytosol, are the main center of glutathione synthesis in leaves as well as in roots. After GSH treatment for 24 h, severe ultrastructural damage related to increased levels of glutathione was found in roots, in all organelles except mitochondria. Possible negative effects of GSH treatment leading to the observed ultrastructural damage are discussed.

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Abbreviations

BSO:

buthionine sulfoximine

γ-ECS:

γ-glutamylcysteine synthetase

GSH:

reduced glutathione

GSSG:

oxidized glutathione

TEM:

transmission electron microscope

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  1. Institute of Plant Sciences, University of Graz, Graz

    B. Zechmann, M. Müller & G. Zellnig

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  1. B. Zechmann
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  2. M. Müller
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Correspondence and reprints: Institut für Pflanzenwissenschaften, Universität Graz, Schubertstrasse 51, 8010 Graz, Austria.

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Zechmann, B., Müller, M. & Zellnig, G. Intracellular adaptations of glutathione content in Cucurbita pepo L. induced by treatment with reduced glutathione and buthionine sulfoximine. Protoplasma 227, 197–209 (2006). https://doi.org/10.1007/s00709-005-0129-z

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