CELL AND NUCLEAR SIZE IN RELATION TO POLYSOMATY AND THE NUCLEAR CYCLE
CELL AND NUCLEAR SIZE IN RELATION TO POLYSOMATY AND THE NUCLEAR CYCLE
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DOI：
10.2307/2438729
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发表时间：
1954-01-01
影响因子：
3
通讯作者：
BRADLEY, MV
中科院分区：
文献类型：
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作者：
BRADLEY, MV
测定了压扁的6-7英寸毛白花南瓜髓的前期、末期和能细胞及核的面积。在茎顶端下方。在世博会的条件下。面积大致与体积成正比。对前期和末期染色体进行计数。当细胞区和核区的对数相互绘制时，前期和末期是不同的。按染色体数目分组--4个[图像]、8个[图像]或16个[图像](无2个[图像]细胞)。能细胞和核的大小也分为3个相对不同的类别。能细胞和核的种类与前期的关系为三类能核中可能的染色体数目提供了证据。早期细胞和核的大小显然是相同的，无论核包含8个[图像]2染色单体染色体或4个[图像]4-染色单体染色体。端粒期核卷。在4个[图像]、8个[图像]和16个[图像]类别中，没有明显偏离1：2：4的比例。显然，同样的情况也适用于Vols。在多体体中具有连续步骤的能核。然而，在前期，核体积增加的因素随着染色体数目的每一次重复而增加。细胞体积。在这3个核子阶段中，每一个阶段都增加了大约一倍。3染色体数目每增加一倍。
Areas of prophase, telophase and energic cells and nucleic were measured in well-flattened squash preparations of the pith of Nicotiana tomentosa 6-7 in. below the stem apex. Under the conditions of the expt. area is roughly proportional to vol. The chromosomes of the prophases and telophases were counted. When logs of cell and nuclear areas were plotted against one another, the prophases and telophases were distr. in distinct groups according to chromosome number-__4[image], 8[image] or 16[image] (no 2[image] cells were present). Energic cell and nuclear sizes also fell into 3 relatively distinct classes. The relationship of the classes of energic cells and nuclei to those at prophase provided evidence of the probable chromosome numbers in the three classes of energic nuclei. Sizes of prophase cells and nuclei were apparently the same whether the nuclei contained, for example, the 8[image] number of 2-chromatid chromosomes or the 4[image] number of 4-chromatid ones. Telophase nuclear vol. in 4[image], 8[image], and 16[image] classes did not deviate significantly from a 1:2:4 ratio. The same apparently applied to vols. of energic nuclei with successive steps in polysomaty. At prophase, however, the factor of nuclear volume increase was greater with each duplication of the chromosome number. Cell vol. at each of the 3 nuclear stages increased by a factor of approx. 3 with each doubling of the chromosome number.