Sulphate induced accumulation of glutathione and frost-tolerance of spinach leaf tissue |
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Authors: | Luit J de Kok Peter J L de Kan Otto G Tánczos Pieter J C Kuiper |
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Institution: | Department of Plant Physiology, University of Groningen, P. O. Box 14, 9750 AA Haren (Gn.), The Netherlands. |
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Abstract: | Water-extractable sulfhydryl content of spinach leaf discs increased up to four-fold when they were incubated with sulphate (10–100 m M ) for 20 h in light or darkness. The accumulated sulfhydryl compound was reduced glutathione. An increased glutathione content did not result in a higher frost-tolerance of the spinach leaf discs. Both freezing temperature and time of exposure to freezing, determined as the point at which 50% of the cells were killed, remained unchanged after incubation with sulphate. These observations suggest that a sulfhydryl compound as glutathione does not play a direct role in protection of plants against freezing injury. |
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Keywords: | Sulfhydryl compounds freezing injury |
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