Abstract
A three-dimensional clinostat which controlled by computer programs was developed to examine the effects of microgravity on the growth and differentiation of higher plants. In clinostat-grown seedlings of garden cress, Lepidium sativum L., the growth of cotyledons was promoted, but that of hypocotyl was not, compared to the earth-grown control. Photosynthetic activity per mg chlorophyl in cotyledons was unchanged, but the amount of photosynthesis per cotyledon increased in clinostat-grown seedlings compared to the control. Use of an appropriate computer program was pointed out for better simulation of microgravity condition.
