萌发玉米种子脱水耐性与胚根细胞超微结构的变化

Changes in Radicle Cell Ultrastructure of Germinated Zea mays Seeds during Desiccation

摘要:

玉米种子脱水试验表明,25℃下萌发24 h种子脱水耐性开始丧失,丧失50%和100%的时间分别为33 h、58 h。萌发过程中随着吸胀时间增加,玉米种子脱水耐性逐步丧失。显微观察显示,种子吸胀过程中,胚根细胞的贮藏物质逐步减少,线粒体等细胞器的分化程度则不断提高,尤其是脂类物质的分解程度与脱水耐性变化的关系似乎更明显。

Abstract:

Germinated maize (Zea mays) seeds were used for desiccation tolerance experiment. The seeds started to lose desiccation tolerance at 25℃ after germination for 24 hours. The loss of desiccation tolerance reached 50% and 100% after 33 and 58 hours, respectively. Ultrastructure observation showed that the reserve substances especially lipids in radicle cells decomposed gradually during treatment, while organelles such as mitochondria were well differentiated.