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Sulphate induced accumulation of glutathione and frost-tolerance of spinach leaf tissue
Authors:Luit J de  Kok  Peter J L de  Kan  Otto G Tánczos  Pieter J C Kuiper
Institution:Department of Plant Physiology, University of Groningen, P. O. Box 14, 9750 AA Haren (Gn.), The Netherlands.
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.
Keywords:Sulfhydryl compounds  freezing injury
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