Simulated Low-gravity Environments and Respiratory Metabolism in Avena Seedlings

Abstract

Horizontal clinostat rotation at 2 rpm increased respiration and inorganic and organic phosphorus content of sand-grown oat (Avena sativa) seedlings. Increased coleoptile geotropism and root growth are attributed to rotational nullification of the directional component of the gravitational stimulus. The relationship between plant metabolism and auxin concentration could explain the growth modifications.