Hejnowicz Z, Sievers A
Botanical Institute, University of Bonn.
Protoplasma. 1981;108(1-2):117-37. doi: 10.1007/BF01276887.
The behavior of statoliths in rhizoids differently oriented with respect to the gravity vector indicates that there are cytoskeleton elements which exert forces on the statoliths, mostly in the longitudinal directions. Compared to the sum of the forces acting on a statolith, the gravitational force is a relatively small component, i.e., less than 1/5 of the cytoskeleton force. The balance is disturbed by displacing the rhizoid from the normal vertical orientation. It is also reversibly disturbed by cytochalasin B such that some statoliths move against the gravity force. Phalloidin stabilizes the position of the statoliths against cytochalasin B. We infer that microfilaments are involved in controlling the position of statoliths, and that there is a considerable tension on these microfilaments. The vibration frequency of the microfilaments corresponding to this tension is in the ultrasonic range.
平衡石在相对于重力矢量不同取向的假根中的行为表明，存在细胞骨架成分对平衡石施加力，主要是在纵向方向上。与作用在平衡石上的力的总和相比，重力是一个相对较小的分量，即小于细胞骨架力的1/5。将假根从正常垂直取向移位会扰乱这种平衡。细胞松弛素B也会可逆地扰乱这种平衡，使得一些平衡石逆着重力移动。鬼笔环肽可稳定平衡石的位置以抵抗细胞松弛素B。我们推断微丝参与控制平衡石的位置，并且这些微丝上存在相当大的张力。与这种张力相对应的微丝振动频率在超声范围内。
