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. Palatinose (isomaltulose, 6-O-α-D-glucopyranosyl-D-fructose) is a structural isomer of sucrose which is produced from sucrose by some bacterial strains as a reserve material during periods of low carbon availability. The ability to synthesise palatinose is not only advantageous for the bacteria but is also of industrial interest since palatinose is used as a sucrose substitute in food production...
Abstract. Palatinose (isomaltulose, 6-O--D-glucopyranosyl-D-fructose) is a structural isomer of sucrose which is produced from sucrose by some bacterial strains as a reserve material during periods of low carbon availability. The ability to synthesise palatinose is not only advantageous for the bacteria but is also of industrial interest since palatinose is used as a sucrose substitute in food production...
Abstract. Potato (Solanum tuberosum L. cv. Desir) plants with reduced amounts of P-protein, one of the subunits of glycine decarboxylase (GDC), have been generated by introduction of an antisense transgene. Two transgenic lines, containing about 6070% less P-protein in the leaves compared to wild-type potato, were analysed in more detail. The reduction in P-protein amount led to a decrease in the...
Abstract. When spinach (Spinacia oleracea L.) leaf disks were incubated in 10% polyethylene glycol to induce water stress, the ratio of glucose-1-phosphate to glucose-6-phosphate increased. This increase indicated an imbalance in the phosphoglucomutase (EC 2.7.5.1) reaction, which was earlier observed to be close to equilibrium, and was accompanied by higher fructose-1,6-bisphosphate and ribulose-1,5-bisphosphate...
Although increased concentrations of CO 2 stimulate photosynthesis, this stimulation is often lost during prolonged exposure to elevated carbon dioxide, leading to an attenuation of the potential gain in yield. Under these conditions, a wide variety of species accumulates non-structural carbohydrates in leaves. It has been proposed that starch accumulation directly inhibits photosynthesis,...
Abstract. Cytosolic NADP-dependent isocitrate dehydrogenase (cyt-NADP-ICDH; EC 1.1.1.42) has been suggested to play a major role in the production of 2-oxoglutarate, an important precursor for amino acid synthesis. Using an antisense RNA approach under the control of the cauliflower mosaic virus 35S promoter, transgenic potato plants were created in which NADP-ICDH activity was reduced to 8% of the...
Abstract. Potato (Solanum tuberosum cv. Dsire) plants expressing yeast invertase directed either to the apoplast, vacuole or cytosol were biochemically and physiologically characterised. All lines of transgenic plants showed similarities to plants growing under water stress. Transformants were retarded in growth, and accumulated hexoses and amino acids, especially proline, to levels up to 40-fold...
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