Abstract
We have shown that in Japanese flowering cherry grown under simulated microgravity condition, its mechanical rigidity of stem was remarkably decreased. In this study, factors related to photosynthesis in 4 weeks old seedlings of Japanese flowering cherry on earth and under simulated microgravity condition were measured. No significant difference between the mean photosynthesis rate in both was found. The factors related to photosynthesis ability of both plants such as photosynthesis rate, chlorophyll content, chlorophyll a/b ratio and the density of stomata, were almost similar. These showed that photosynthesis activity of the seedlings was not changed under simulated microgravity condition, although its mechanical rigidity was decreased under such condition.
