Duration of Mitotic Cycle and Patterns of DNA Replication in Chromosomes ofAllium Cepa

Chromosome Polarization and Nuclear Rotation in <i>Allium cepa</i> Roots

“…There are only a few very tiny differentially stained regions on other portions of the chromosomes. This is surprising in view of the earlier reports by Levan (1946), Vanderlyn (1948) , and Matagne (1968) of heterochromatin at the telomeres and centromeres of Allium cepa chromosomes . Apparently our stain- (Levan 1946) and other organisms (Yamasaki 1971, Cooper and Hsu 1972, Gropp and Natarajan 1972 •~1120.…”

Global analysis of an exponential model of cell proliferation for estimation of cell cycle duration in the root apical meristem of angiosperms

“…The only exception is developing metaxylem cell files in some monocots, in which mitoses terminate much more closely to the root apex than in other tissues, but these cells comprise only a small fraction of all cells in the meristem. Note that at the boundary of the meristem and the elongation zone, there is the transition domain of the RAM in which 16.6 ± 1.3 23.0 13.5 Antosiewicz, 1990;Arcara and Nuti, 1967;Gimenez-Abian et al, 1987;González-Fernández et al, 1971;Matagne, 1968;Morcillo et al, 1978;Navarrete et al, 1983. Allium porrum L.…”

Ameliorating effect of nanoparticles and seeds’ heat pre-treatment on soybean plants exposed to sea water salinity

“…In the root apical meristem were determined: the total number of mitotically active cells (mitotic index, MI), the number of cells in different phases of mitosis (mitotic phase index, MP), and the relative proportion of a certain mitotic phase from the sum of all mitotic phases ( Table 3 ). It should be recalled here that the frequency of detection of one or another phase of mitosis in a population of dividing cells is proportional to the duration of this phase [ 42 ].…”