Sugar Content and Activity of Sucrose Metabolism Enzymes in Milled Rice Grain
AUTOR(ES)
Smyth, Douglas A.
RESUMO
Most rice (Oryza sativa L.) cultivars grown in the United States were selected for endosperm starch properties and not soluble sugar content. The minor pool of soluble sugar may affect the qualities of rice as a food. Some cultivar variation in soluble sugar content was detected in milled grain, essentially the starchy endosperm, of long grain varieties. Milled grain of cultivars Lemont and Texmati had a soluble sugar content of 0.21 and 0.35% (w/w), respectively, on a fresh weight basis. The dorsal portion of the milled grain contained the greatest amount of soluble sugar, approximately tenfold the amount found in the central core of the grain. Extracts of the milled grain contained sucrose-phosphate synthase (EC 2.4.1.14) and sucrose synthase (EC 2.4.1.13) activities, which were separated by anion exchange chromatography. The presence of sucrose-phosphate synthase in the rice endosperm suggested a mechanism for sucrose accumulation which might be involved in carbon partitioning during grain development.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1055940Documentos Relacionados
- Enzymes of Carbohydrate Metabolism in the Developing Rice Grain
- Enzymes of Starch Metabolism in the Developing Rice Grain 1
- Sugar-mediated acclimation: the importance of sucrose metabolism in meristems.
- Sucrose synthase molecular marker associated with sugar content in elite sugarcane progeny
- Enzymes of Sucrose and Hexose Metabolism in Developing Kernels of Two Inbreds of Maize
