桔梗卫星搭载后超微结构的变化

目的：探讨空间环境对药用植物的影响。方法：以药用植物桔梗种子为材料，搭载返回式人造地球卫星，回到地面后研究其超微结构的变化。结果：光镜条件下飞行组和地面组叶片的组织结构基本相同；电镜条件下可以看到飞行组和地面组的细胞核、叶绿体等超微结构有一定程度的区别。结论：空间环境对桔梗有一定影响，这种影响尚待深入研究。

Ultrastructural Changes after Space Flight in Platycodon grandiflorum (Jacq.) DC.

Objective:To substantiate the effect of space co nditions on medicinal plants.Method:The seeds of platycodon grandiflorumg we re set up in retrievable satellites. After returning to earth, the ultrastructural changes of leaves were studied. Result: Under light microscope, the leaf tissue structure of the flig ht group and the earth controlled group were alike and under electron microscope , some differences could be found in the nucleus and choloroplasts between the t wo groups.Conclusion: Space environment has some effect on Platycodon grandiflorum, and the effect needs to be further explored.