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- W2127255545 abstract "The sugars in the endosperm of a developing seed have many potential roles, including the supply of carbon to the developing embryo and controlling gene expression in it. Our understanding of their metabolism is, however, fragmentary and is confined to a very few species (especially Vicia spp.). To develop a quantitative understanding of the regulation of sugars in seeds of oilseed rape (Brassica napus), we measured relevant enzyme activities, the sizes of the pools of sugars in the liquid endosperm, and the flux of sugars from the endosperm into the embryo. The concentrations of hexose sugars in the liquid endosperm decreased, and sucrose (Suc) increased through development. The overall osmotic potential also fell. The timing of the changes was not precise enough to determine whether they signaled the onset of rapid accumulation of storage products. Changes in endosperm invertase activity were complex and quantitatively do not explain the changes in sugars. The embryo can metabolize hexose sugars in addition to Suc, and possibly at higher rates. Therefore, in addition to invertase, the growing embryo itself has a potential to influence the balance of sugars in the endosperm. The activity of Suc synthase in the embryo was greater than that of invertase during development. This observation and a higher activity of fructokinase than glucokinase in the embryo are both consistent with the embryo using Suc as a carbon source." @default.
- W2127255545 created "2016-06-24" @default.
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- W2127255545 date "2003-01-01" @default.
- W2127255545 modified "2023-10-17" @default.
- W2127255545 title "Metabolism of Sugars in the Endosperm of Developing Seeds of Oilseed Rape" @default.
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- W2127255545 doi "https://doi.org/10.1104/pp.010868" @default.
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