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Sugar compartmentation in frost-hardy and partially dehardened cabbage leaf cells

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Abstract

In frost-hardy and partially dehardened leaves of Brassica oleracea L. var. sabellica L. the distribution of cryoprotective sugars and of chloride between chloroplasts and the nonchloroplast part of leaf cells was investigated using the nonaqueous isolation technique as a means of cell fractionation. In chloroplasts of frost-hardy leaves high concentrations of sucrose and raffinose and comparatively low concentrations of chloride have been found. The ratios between sugars and chloride were so as to ascertain complete protection of the frost-sensitive thylakoid membranes during freezing. During dehardening, sugars decreased especially in the chloroplasts. There was a conversion of sucrose and raffinose into monosaccharides. This led to a large increase in the concentration of glucose and fructose in the nonchloroplast parts of the cells. There is evidence that the sugar concentration in the vacuole increased at the expense of sugars located in chloroplasts and cytoplasm. The quantity of sugars that remained in the chloroplasts did not appear to be sufficient for complete membrane protection at very low freezing temperatures.

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Santarius, K.A., Milde, H. Sugar compartmentation in frost-hardy and partially dehardened cabbage leaf cells. Planta 136, 163–166 (1977). https://doi.org/10.1007/BF00396193

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Key words

  • Brassica
  • Chloroplasts
  • Frost hardiness
  • Nonaqueous cell fractionation
  • Sugar compartmentation