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向重力性反应是植物适应地球重力环境的一个重要生理过程,是植物正常生长发育不可缺少的反应机制,但是,微重力是否影响植物种子发育至今尚无一致性结论.本文研究了三维回转器回旋模拟微重力对拟南芥种子发育(胚胎发育与代谢活动)的影响.研究结果表明,三维回转条件下,拟南芥果荚出现不规则弯曲或扭曲形态,形成的种子中可溶性糖和淀粉含量明显增加,盐溶性贮藏蛋白质含量显著降低而碱溶性蛋白质含量显著升高,球形胚时期的种子对三维回转处理最为敏感.对球形胚时期的植株进行短期的三维回转处理可抑制胚柄细胞的分裂和伸长,而胚柄伸长受阻可能会影响到营养物质向胚胎中输送,进而导致部分胚胎败育.对种子干燥脱水阶段的植株进行三维回转处理不影响胚胎的发育,但会导致种子贮藏蛋白质含量下降.
The gravitational reaction is an important physiological process that plants adapt to the earth’s gravimetric environment and is an indispensable reaction mechanism for the normal growth and development of plants. However, there is no consistent conclusion whether microgravity affects plant seed development.This paper studies the effects of three- Simulation of microgravity on Arabidopsis seed development (embryonic development and metabolic activity) .The results show that the three-dimensional rotation conditions, Arabidopsis pod irregular bent or twisted morphology, the formation of seeds of soluble sugar and starch content The content of soluble protein in soluble salt storage significantly decreased and the content of alkali soluble protein increased significantly, and the seeds in spherical embryo were the most sensitive to the three-dimensional rotary processing.The short-term three-dimensional rotation processing of the plants in the spherical embryo inhibited the division of the stem cells And elongation, and hindered elongation of the embryo stem may affect the delivery of nutrients to the embryo, which led to the abortion of some embryos.Drying and dehydration of seeds in the stage of three-dimensional rotary processing does not affect embryonic development, but will lead to seed storage protein Decreased content.