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This report describes a case where the surplus energy in the leaf from photosynthesis can be stored in the chloroplast either as carbohydrate or as lipid, depending on termperature.

The starch accumulated in chloroplasts of grapevine leaves fell, with increasing temperature, from 23% of dry weight at 18/13oC (day/night) to 1% at 35/30oC, where as total lipids rose fro 6 to 16% dry weight. At 35/30oC chlorophyll content of chloroplasts was high grana prominent, suggesting that the results were due to selective effects of temperature on metabolic pathways.

Effects of Temperature on Accumulation of Starch or Lipid in Chloroplasts of Grapevine

1971, Planta, vol 101, pages 166 – 170

 ocsiro 226

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