Las hojas almacenan una proporción importante del carbono fijado por la fotosíntesis como almidón; su síntesis evita que la acumulación de azúcares altere el potencial osmótico celular e inhiba la actividad fotosintética. La degradación nocturna del almidón garantiza la disponibilidad de la materia y energía para la síntesis de sacarosa que se exporta al resto de la planta. La degradación del almidón está sujeta a un control que coordina la velocidad del proceso con la de exportación de sacarosa. En este artículo se hizo una revisión de la información que describe la manera en que el ritmo circadiano y la trehalosa 6-P se combinan para que el proceso de degradación del almidón sea efectivo y flexible.
In this paper, we report the use of oxidized glutathione (GSSG) in promoting the association of bean seed proteins to starch granules purified from potato tubers. The resulting interaction was stable and only a small fraction of the bound proteins was released by washing with 5% glucose. Higher concentrations of glucose or other sugars (fructose, mannose and mannitol) failed to further increase protein release. Dithiothreitol (DTT) at concentrations up to 50 mM did not liberate the proteins associated to starch; however, applied after GSSG but before adding the proteins, it was very effective in preventing binding of proteins to starch. Lastly, starch modified by the bound proteins increased its water absorption capacity.
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