Abstract
AbstractThe morphological changes of several grasses, dicotyledons and thallial plants to decreasing increments of gravity from the normal 1 g to 0 g were determined. The various levels of simulated hypogravity were obtained by regulation of the angles of the rotating clinostats. Reaction to simulated hypo‐gravity is evidenced by leaf, petiole, stem and coleoptile epi‐nasty, root hyponasty in the leafy plants and cereal seedlings and increased lobulation in gametophytes. Threshold response for the gametophyte, marigold, bean and pepper plants was approximately 0.67 x g while that for the wheat, corn and oat seedlings was 0.17xg. The intensity of the epinastic response was found to be inversely related to the gravitational force. With leafy plants, significant responses to reduced gravity are shown only in the presence of light perhaps influencing their ability to synthesize auxin.
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