Shen-Miller J, McNitt R E
Division of Biological and Medical Research, Argonne National Laboratory, Argonne, Illinois 60439.
Plant Physiol. 1978 Apr;61(4):649-53. doi: 10.1104/pp.61.4.649.
In outer cortical cells of corn (Zea mays L.) roots we made ultrastructural comparisons between the geotropically responding (661 nm irradiated) and nonresponding (dark control) roots in both the curving and noncurving regions of the root. In the control treatment, Golgi apparatus (dictyosomes) and mitochondria exhibited centrifugal distribution (taking the stele as the center) in both regions of the roots (the organelles localized in the top of the cells in the upper tissues, and in the bottom of the cells in the lower tissues). In the geotropically responding roots, the distribution patterns were the same as those of the controls. However, in the zone of curvature the dictyosomes (but not the mitochondria) were randomly distributed in the cells of the upper tissues. This change in pattern of dictyosome distribution could be related to the change in cell elongation of upper cells.
在玉米（Zea mays L.）根的外皮层细胞中，我们对根的弯曲和非弯曲区域中向地性响应根（661纳米照射）和无响应根（黑暗对照）进行了超微结构比较。在对照处理中，高尔基体（dictyosomes）和线粒体在根的两个区域均呈现离心分布（以中柱为中心）（细胞器位于上部组织细胞的顶部，下部组织细胞的底部）。在向地性响应根中，分布模式与对照相同。然而，在弯曲区域，dictyosomes（而非线粒体）在上部组织的细胞中随机分布。dictyosome分布模式的这种变化可能与上部细胞的细胞伸长变化有关。
