The mechanism of component change and cease of growth at the late ripening stage of seed in soybean.

大豆种子在成熟过程中，由其它器官运输的糖、氨基酸和矿物质合成贮藏蛋白、脂肪和碳水化合物。碳水化合物及其它组分、叶绿素、氮化合物等的变化，在种子成熟期也观察到随时间的变化。因此，本研究旨在探讨环境条件对大豆种子生长停止物质代谢的影响及其品种间的差异，以期对大豆种子生长停止的机理有新的认识。小金台津结果表明，影响铃丸种子生长发育的因子随种子成熟期的不同而变化，即：早熟期（开花至直线生长开始）、中熟期（直线生长期间）和晚熟期（直线生长结束后至全熟期）。中熟期种子的生长速度和持续时间取决于完全成熟种子的大小。在后熟期，决定种子生长速率和持续时间的因素易随环境条件而变化，且品种间存在差异。此外，从中熟期到晚熟期的转变时间在种子和荚果中存在差异。因此，种子的成熟过程是由种子本身决定的。

Storage proteins, fats and carbohydrates are synthesized with sugars, amino acids and minerals transported from other organs in soybean seeds at ripening stage. The change of carbohydrates and other components, chlorophyll, nitrogen compounds ets., with time are also observed at ripening stage in seeds. Therefore, the effects of environmental conditions on their matter metabolism and their varietal differences were examined in this report to get the new knowledge on the mechanism of the cease of seed growth.Soybean plants (cv. Koganedaizuand cv. Suzumaru) were cultivated in fields, and shaded treatments were applied.The factors to regulate seed growth were indicated to change with seed ripening stages, early ripening stage (from anthesis to the onset of linear growth), middle ripening stage (during linear growth) and late ripening stage (after the end of linear growth to full ripe stage). In the middle ripening stage, growth rate of seed and duration of this stager were decided with the size of fully matured seed. In the late ripening stage, the factors to decide seed growth rate and duration of the stage were easy to change with the environmental conditions and were different among cultivars. In addition, the time to change from the middle ripening stage to the late ripening stage was different in seeds from that in pods. Therefore, it is suggested that the ripening processes of seeds were decided by the seeds themselves.