Nedukha O M
Institute of Botany of Nat. Academy Sci. of Ukraine, Kiev.
J Gravit Physiol. 1997 Jul;4(2):P79-80.
It was established early that the signs of accelerated aging of both plant leaves and of moss chloronema were observed in seedlings of high plants and in Funaria hygrometrica protonema under long term growing under weightlessness. It was observed the structure changing of photosynthesizing cells in Arabidopsis thaliana, Epidendrum radicans and Pisum sativum leaves. Authors found out the extension and vesiculation of thylakoids between chloroplast granas. They observed thylakoids partly destroying under 96 and 110 days microgravity influence. But some questions are still opened: 1. Are these changes consequence of accelerated differentiation and aging photosynthesizing cells? 2. Do the definite changes appear in photosynthesizing cells during short-term microgravity influence? Therefore the study of mesophyll cells ultrastructure of leaves that finished growth by tension in microgravity was the idea of our experiment.
早在长期失重条件下生长的高等植物幼苗和葫芦藓原丝体中就已发现，植物叶片和苔藓绿丝体均出现加速衰老的迹象。在拟南芥、辐射石斛和豌豆叶片中观察到光合细胞的结构变化。作者发现叶绿体基粒之间类囊体的延伸和囊泡化。他们观察到在96天和110天的微重力影响下，类囊体部分遭到破坏。但仍有一些问题尚未解决：1. 这些变化是光合细胞加速分化和衰老的结果吗？2. 在短期微重力影响下，光合细胞中是否会出现特定变化？因此，我们实验的想法是研究在微重力下通过拉伸完成生长的叶片叶肉细胞超微结构。
