MOVEMENT OF AMYLOPLASTS IN ROOT CAP CELLS OF GEOTROPICALLY SENSITIVE ROOTS
MOVEMENT OF AMYLOPLASTS IN ROOT CAP CELLS OF GEOTROPICALLY SENSITIVE ROOTS
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DOI：
10.1111/j.1399-3054.1968.tb07305.x
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发表时间：
1968-01-01
影响因子：
6.4
通讯作者：
LARSEN, P
中科院分区：
文献类型：
--
作者：
IVERSEN, TH;PEDERSEN, K;LARSEN, P
在我们的培养条件下，麻黄根冠含有7层(或偶尔8层)含有淀粉的细胞。在最年轻的一层(或两层)中，淀粉质很小，细胞看起来像胚胎。在6个非胚胎层中，淀粉体较大。当根倒置时，6个非胚胎层中最年轻的3个淀粉体开始以大约每小时72μ(在21℃)的速度向细胞的另一端下降，但它们只保持这个速度6到12分钟，之后它们实际上停止了。因此，需要10到12分钟的时间，任何淀粉质体才能接近天花板，就像倒置前一样接近地面；只有最年轻的两个非胚层才是这样。当根部水平放置时，无论是从正常位置还是从倒置位置，淀粉质都能在15分钟或更短的时间内到达下部纵壁。在3个最古老的含淀粉层的细胞中，淀粉体的位置是不稳定的，几乎不依赖于之前的倒置时间。
The root cap ofLepidium sativumunder our culture conditions was found to contain 7 (or occasionally 8) storeys of starch‐containing cells. In the youngest one (or two) of these storeys the amyloplasts are small and the cells appear embryonic. In the 6 non‐embryonic storeys the amyloplasts are large. Upon inversion of the root, the amyloplasts in the 3 youngest of the 6 non‐emhryonic storeys start falling toward the opposite end of the cell at about 72 μ per h (at 21 C), hut they maintain this speed for only 6 to 12 min, after which they virtually come to a stop. As a result, it takes 10 to 12 min before any of the amyloplasts get approximately as close to the ceiling as they were to the floor before the inversion; and this is true only of the 2 youngest of the non‐embryonic storeys. When the root is placed horizontal, whether coming from the normal or the inverted position, the amyloplasts reach the lower, longitudinal wall in 15 min or less. The positions of the amyloplasts in the cells of the 3 oldest starch‐containing storeys are erratic and show little, if any, dependency on the preceding time of inversion.