金线莲花药发育中的钙离子分布特征

该研究以金线莲不同发育时期的花药为材料,采用电子显微镜观察花粉块中的钙离子分布,以揭示钙离子在金线莲花药发育中的相关生理功能.结果 发现:(1)在造孢细胞时期,较多的钙沉淀颗粒出现在花药表皮和药室内壁细胞的液泡中,暗示钙离子与植物细胞的液泡发生和形成有关.(2)在减数分裂前期,小孢子母细胞核中聚集了较多的钙沉淀颗粒,当...

Characteristics of Calcium Distribution in the Developing Anthers of Anoectochilus roxburghii

In order to reveal the physiological function of calcium in the developing anthers of Anoectochilus roxburghii at different developmental stages, we observed the distribution of calcium in pollinium by electron microscope. The results showed: (1) during sporogenous stage, many calcium precipitations appeared in the vacuoles of anther epidermis and endothecium cells, suggesting calcium were related to vacuolation in the cells. (2) In the early stage of meiosis, many calcium precipitates were accumulated in the nucleus of microspore mother cells. When the microspore mother cell divided, a large number of calcium precipitates appeared between the two sets of chromosomes, indicating that calcium were related to meiosis of microspore mother cell. (3) The surface of plastids was covered with many calcium precipitates indicating that calcium were related to the sugar metabolism of the plastid function in pollen cells. The result indicated that there are still a large number of calcium precipitates on the exine of pollinium surface and in mature pollen cytoplasm, so as to reserve the calcium for pollen germination.