Hensel W
Botanisches Institut der Universitat, Bonn, FRG.
Adv Space Res. 1986;6(12):55-9. doi: 10.1016/0273-1177(86)90066-9.
During outgrowth of the radicle of cress (Lepidium sativum L.) the statocytes of the root cap develop a structural polarity with the nucleus at the proximal cell pole and a complex of endoplasmic reticulum (ER) at the distal cell pole. Amyloplasts sediment upon this complex of ER. During all stages of development the cytoskeleton (microtubules, microfilaments) is involved in positioning of the ER. The structural polarity of the statocytes develops independently of gravity, as indicated by corresponding results from fast and slow rotating clinostats and roots grown under microgravity in orbit. Disturbance of the structural polarity is possible by application of drugs, influencing microtubules and microfilaments. If, by rotation of roots on slow rotating clinostats or centrifugation, the structural polarity of the statocytes is changed, the ability of the roots to perceive gravity is affected also.
在水芹（独行菜）胚根生长过程中，根冠的平衡细胞会形成一种结构极性，细胞核位于细胞近端极，内质网复合体位于细胞远端极。淀粉体沉降在内质网复合体上。在发育的各个阶段，细胞骨架（微管、微丝）都参与内质网的定位。平衡细胞的结构极性独立于重力而发育，快速和慢速旋转回转器以及在轨道微重力条件下生长的根的相应结果表明了这一点。通过应用影响微管和微丝的药物，有可能扰乱结构极性。如果通过在慢速旋转回转器上旋转根或离心，改变平衡细胞的结构极性，根感知重力的能力也会受到影响。
