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Reduced and oxidised glutathione and glutathione-reductase activity in tissues of Pisum sativum

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Abstract

In three-week-old pea plants (Pisum sativum L., cv. Little Marvel) grown in the light, total glutathione levels were highest in apex and expanding leaves (1.5 μmol·(g FW)-1), and lower (0.4–0.6 μmol·(g FW)-1) in older leaves and roots. In the light period, levels in expanded leaves increased by about 40%, compared with dark values, with lesser increases in roots and apex. In illuminated plants the proportion in the reduced form was 86–88% in leaves and 80% in roots, and these values fell during the dark period (to 82% and 69%, respectively). Reduced glutathione makes up 65–70% of the low-molecular-weight thiol in leaves, but over 95% in roots. Chloroplasts contained about 10% of the leaf glutathione, at a concentration of 1–2 mM; total glutathione in the chloroplasts, and the proportion of oxidised form (GSSG) increased in light, while NADP+/NADPH ratios decreased, indicating both synthesis and active oxidation of glutathione in light. Chloroplasts contained 52% (young leaf) to 75% (mature leaf) of the GSSG-reductase (EC 1.6.4.2) activity in the leaves. In roots, over 30% of the GSSG reductase was in the plastid fraction. Very little GSSG-reductase activity was associated with mitochondria in leaf or root.

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Abbreviations

GSH:

reduced form of glutathione

GSSG:

oxidised dimer of glutathione

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Correspondence to K. W. Joy.

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Bielawski, W., Joy, K.W. Reduced and oxidised glutathione and glutathione-reductase activity in tissues of Pisum sativum . Planta 169, 267–272 (1986). https://doi.org/10.1007/BF00392324

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Key words

  • Chloroplast (glutathione)
  • Glutathione
  • Glutathione reductase
  • Pisum (glutathione)
  • Root (glutathione)