Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706.
Plant Physiol. 1978 Feb;61(2):199-203. doi: 10.1104/pp.61.2.199.
Dry weight, leaf number, and leaf size of marigold plants (Tagetes patula) grown from emergence for 18 days on horizontal clinostats rotating at 15 revolutions per hour (rph), were similar to those of plants grown for the same period on vertically oriented clinostats rotating at 15 rph. The horizontally grown plants exhibited some epinasty which disappeared when plants were placed upright for 24 hours. Vertically grown plants when placed on horizontal clinostats for 24 hours exhibited more epinasty than plants grown from emergence on horizontal clinostats.Data are provided to demonstrate that leaves undergo movement (bending) during each rotation cycle that leads to the development of a leaf curvature that is oriented away from the direction of rotation. The results of this study suggest that epinasty of plants placed on horizontal clinostats could be due to uncontrolled movement of plants during rotation rather than controlled by gravity nullification. The usefulness of horizontal clinostats for gravity nullification or simulating weightlessness on plants is questioned.
在水平回转仪上以每小时 15 转的速度（rph）培养 18 天的万寿菊（Tagetes patula）植株，其干重、叶片数和叶片大小与在以同样速度垂直旋转的回转仪上生长的植株相似。水平生长的植株表现出一些偏上性，当植株被放置 24 小时时，这种偏上性消失。当将垂直生长的植株放置在水平回转仪上 24 小时时，其偏上性比从水平回转仪上开始生长的植株更明显。提供的数据表明，叶片在每个旋转周期中都会发生运动（弯曲），导致叶片曲率朝向远离旋转方向的方向发展。本研究的结果表明，放置在水平回转仪上的植株的偏上性可能是由于旋转过程中植株的不受控制的运动，而不是由重力抵消控制的。因此，水平回转仪用于消除重力或模拟植物失重的有效性受到了质疑。
