Investigations on heat resistance of spinach leaves

  title={Investigations on heat resistance of spinach leaves},
  author={Kurt Adolf Santarius and Mechthild M{\"u}ller},
Exposure of spinach plants to high temperature (35° C) increased the heat resistance of the leaves by about 3° C. This hardening process occurred within 4 to 6 h, whereas dehardening at 20°/15° C required 1 to 2 days. At 5° C dehardening did not take place. Hardening and dehardening occurred in both the dark and the light. The hardiness was tested by exposure of the leaves to heat stress and subsequent measurements of chlorophyll fluorescence induction and light-induced absorbance changes at… CONTINUE READING
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