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

贮藏蛋白质、脂肪和碳水化合物是大豆种子成熟时从其他器官运输来的糖、氨基酸和矿物质合成的产物。在种子成熟过程中，还观察到了碳水化合物等成分、叶绿素、含氮化合物等随时间的变化。因此，本文对环境条件对大豆种子物质代谢的影响及其品种差异进行了研究，以期对大豆种子停止生长的机理有新的认识。Koganedaizuand cv.结果表明，种子生长调控因子随种子成熟期、早熟期(开花至成熟期)、成熟中期(成熟期)和成熟期(成熟期后)而变化。在种子成熟中期，种子的生长速度和历时取决于完全成熟种子的大小。在晚熟阶段，决定种子生长速度和历时的因素容易随着环境条件的变化而变化，且品种之间存在差异。此外，种子从中熟到晚熟的时间也不同于豆荚。因此，认为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.