An Analysis of Cell Morphology and the Periodicity of Division in the Root Tip of Allium Cepa

Cytophotometrical Study of DNA in the Root Tip of <i>Vicia faba</i>

“…This fact accords with the results obtained with bio chemical analysis by Jensen (Jensen 1956(Jensen , 1958. This particular part also showed only one peak in the histogram (Fig.…”

Composition of Developing Primary Wall in Onion Root Tip Cells. I. Quantitative Analyses

“…The roots were analyzedc morphologically in the same way as reported earlier (9 Figure 1 presents the average cross sectional area. length, and surface area of the cells in each 100 A section.…”

“…The percent of nuclei in division is also presented in figure 1. A detailed morphological analysis of the onion root has been published (9) and complete discussion of the morphology of the root will not be undertaken here.…”

“…Previous work on onion root tips has outlined some of these changes that occur early in the development of the cell (7,8,9,11 The roots were sectioned transversely on a reg- …”

Ploidy level increases mitotic divisions in Allium roots.

“…With a constant propor tion of cells in mitosis, the mitotic indexes of different ploidy level roots can be more easily compared. Jensen and Kavaljian (1958) noted that in Allium cepa roots over 2.0cm long the periodicity of cell divisions is less pronounced than in shorter roots. Such a decrease in periodicity with increasing root length is also considered to occur in A. triquetrum roots and thus the roots used in the present study were between 1.0 and 1.8cm long.…”