Photosynthetic carbohydrate metabolism in the resurrection plant Craterostigma plantagineum

M. Norwood, M.R. Truesdale, A. Richter, P. Scott
2000 Journal of Experimental Botany  
restricted to the main meristems or cores of these plants. Fully mature leaves can lose up to 95% of their water The resurrection plant Craterostigma plantagineum content and enter a dormant state and then, upon rewater-(Hochst) is able to survive almost complete tissue ing, the leaves are reanimated and are fully photosyndehydration when water is withheld from it, and then thetically active within 24 h (Schwall et al., 1995). Tissue can rehydrate rapidly on rewatering. This ability is damage
more » ... rough this drying and rehydration process believed to be the result of the accumulation of sucappears to be minimal to non-existent. rose in aerial tissues as a result of metabolism of In most instances where the phenomenon has been 2-octulose. In this work the metabolic activity of wellresearched the acquisition of the resurrection capability watered Craterostigma plantagineum plants has been appears to be associated with the accumulation of a investigated. It is shown that Craterostigma makes carbohydrate in the tissues as they dry. In a majority of raffinose series oligosaccharides as a product of cases sucrose is the major carbohydrate which accumuphotosynthesis and translocates them in the phloem. lates (Ingram and Bartels, 1996), however, trehalose has Evidence is also provided that 2-octulose is a product been reported in certain resurrection species (Drennan of photosynthesis and accumulates in the leaves over et al., 1993). The period of time required for accumulation the light period and is mobilized at night. Thus of this carbohydrate must be crucial during the drying 2-octulose acts as a temporary storage carbohydrate process. If it is to protect the plant through the dehydrain leaves during photosynthesis in a similar fashion to tion process then it must be able to accumulate rapidly starch in most C 3 plants. Other potential roles of and in sufficient quantity to be of benefit to the plant. In 2-octulose are discussed. Other than these observasome resurrection plant species sucrose accumulates as a tions Craterostigma plants are very similar to other C 3 product of photosynthesis (Mü ller et al., 1997). However, plants under these conditions. it would appear that Craterostigma species have evolved a mechanism by which to aid the accumulation of sucrose
doi:10.1093/jexbot/51.343.159 pmid:10938822 fatcat:2cryr52qe5bmhgh4kllqussto4