Seikagaku Seigyo Kenkyu Shisetsu and Department of Argonomy, Nagoya University, Chikusa, Nagoya, Japan.
Plant Physiol. 1969 May;44(5):765-9. doi: 10.1104/pp.44.5.765.
In a close parallel to the developmental pattern of alpha-amylase activity, a rapid increase of maltase activity occurred in the endosperm tissue of germinating rice seeds after about 4 days of the seed imbibition. The overall pattern of the 2 hydrolytic enzyme activities strongly suggest that amylolytic breakdown is the major metabolic route of starch utilization in the germinating rice seeds. Results of the chemical analyses of sugar constituents as well as the measurements of sucrose synthetase activity show that the scutellum is the site of sucrose synthesis in the germinating rice seeds. It is thus supported that glucose derived from the reserve starch in endosperm is transported to scutellum, where it is converted to sucrose. Sucrose is further mobilized to the growing tissues, shoots and roots.
在与α-淀粉酶活性的发育模式极为相似的情况下，在种子吸胀约 4 天后，萌发水稻种子的胚乳组织中麦芽糖酶活性迅速增加。这两种水解酶活性的总体模式强烈表明，淀粉的分解是萌发水稻种子中淀粉利用的主要代谢途径。糖成分的化学分析结果以及蔗糖合成酶活性的测量结果表明，在萌发的水稻种子中，盾片是蔗糖合成的部位。因此可以推断，来自胚乳中储备淀粉的葡萄糖被运输到盾片中，在那里转化为蔗糖。蔗糖进一步动员到生长组织、茎和根中。
