游离糖与水稻籽粒发育过程中淀粉积累的关系。
Free sugars in relation to starch accumulation in developing rice grain.
机构信息
Department of Chemistry, The International Rice Research Institute, Los Baños, Laguna, Philippines.
出版信息
Plant Physiol. 1977 Mar;59(3):417-21. doi: 10.1104/pp.59.3.417.
Abstract
The changes in sugars (water-soluble carbohydrates) were studied in the developing grain of rice (Oryza sativa L., variety IR28 and IR29) in relation to the role of these sugars as precursors of ADP glucose in starch accumulation. The levels of total sugars, total reducing sugars and free glucose, sucrose and other nonreducing sugars, maltooligosaccharides, and total and nonsucrosyl fructose followed closely the changes in the rate of starch accumulation, in both IR28 and 29; the peak value occurred 9 days after flowering. The level of soluble carbohydrates remained high in the caryopsis and also in milled rice after starch accumulation, suggesting that the supply of sugar precursors does not limit starch accumulation in the rice grain. Because of a higher level of reducing sugars, the level of free sugars in the grain of waxy rice IR29 was higher than that of nonwaxy IR28.
摘要
研究了发育中的水稻（Oryza sativa L.，品种 IR28 和 IR29）籽粒中糖（水溶性碳水化合物）的变化，以了解这些糖作为淀粉积累中 ADP 葡萄糖前体的作用。总糖、总还原糖和游离葡萄糖、蔗糖和其他非还原糖、麦芽寡糖以及总果糖和非蔗糖果糖的水平与淀粉积累率的变化密切相关，在 IR28 和 29 中均如此；峰值出现在开花后 9 天。在淀粉积累后，胚乳和碾磨后的大米中可溶性碳水化合物的水平仍然很高，这表明糖前体的供应不会限制水稻籽粒中淀粉的积累。由于还原糖水平较高，蜡质水稻 IR29 籽粒中的游离糖水平高于非蜡质 IR28。
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