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Journal of Experimental Botany, Vol. 51, No. 343, pp. 159-165, February 2000
© 2000 Oxford University Press

Photosynthetic carbohydrate metabolism in the resurrection plant Craterostigma plantagineum

M. Norwood1, M.R. Truesdale1, A. Richter2 and P. Scott1,3

1 School of Biological Sciences, University of Sussex, Brighton BN1 9QG, UK
2 Chemical Physiology of Plants, Institute of Plant Physiology, University of Vienna, Althanstr. 14, A-1091 Wien, Austria

The resurrection plant Craterostigma plantagineum (Hochst) is able to survive almost complete tissue dehydration when water is withheld from it, and then can rehydrate rapidly on rewatering. This ability is believed to be the result of the accumulation of sucrose in aerial tissues as a result of metabolism of 2-octulose. In this work the metabolic activity of well-watered Craterostigma plantagineum plants has been investigated. It is shown that Craterostigma makes raffinose series oligosaccharides as a product of photosynthesis and translocates them in the phloem. Evidence is also provided that 2-octulose is a product of photosynthesis and accumulates in the leaves over the light period and is mobilized at night. Thus 2-octulose acts as a temporary storage carbohydrate in leaves during photosynthesis in a similar fashion to starch in most C3 plants. Other potential roles of 2-octulose are discussed. Other than these observations Craterostigma plants are very similar to other C3 plants under these conditions.

Key words: Craterostigma, resurrection plants, octulose, carbohydrate metabolism.


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