The results of micronucleus assay in meristematic cells
for negative, positive and experiment groups are present also in table 2.
Thus, a transverse row of three daughter cells is formed, of which the middle one is wedge-shaped and acts as a meristematic cell
(Nayar, 1962; Nayar & Kaur, 1971; Rodriguez-Rios, 1973; Duran & de la Sota, 1996; Perez-Garcia et al.
Investigations using high-tech scanning electron and confocal microscopes showed that these stems contained normal-size meristematic cells
All juice samples analyzed were cytotoxic, genotoxic and mutagenic to root meristematic cells
Thus, the technique is based on the physico-anatomical differences among tissues, because meristematic cells
are small, with smaller vacuoles and greater nuclear-cytoplasm ratio than cells which are further from the meristematic region (Figure 1) (WANG et al.
For instance, meristematic cells
give rise to secondary metabolites as part of the plant's survival strategy under stress conditions imposed by living microorganisms (biotic stress) or the physical environment (abiotic stress).
Ontogenetically, the monocot cambium originates from the primary thickening meristem (PTM), which is a region of actively dividing meristematic cells
, located around the apical meristem and extending down the periphery of the stem, where this continuation of PTM is referred to as STM.
The presence of small meristematic cells
with diameter range of 15 to 20pm were observed in globular callus of coffee plants and showed small isodiametric cells (QUIROZ-FIGUEROA et al.
And very recently, the clastogenic and genotoxic potentials of an organochlorine, dichlorophen and an organophosphate, and dichlorvos have been studied using root meristematic cells
of Allium cepa .
In Phoenix dactylifera (date-palm), globular callus exhibited small isodiametric meristematic cells
, varying from 80 to 20 micrometres in diameter (SANE et al.
In this study, relative low frequencies of MN in the meristematic cells
of Allium cepa treated with thiocyclam.
Small meristematic cells
, originally only 20 or 30 [micro]m in diameter may suddenly elongate to perhaps several hundred micrometers.