Roots cell division

Cell Division Inhibitors. The most common mode of action of soil-appHed herbicides is growth inhibition, primarily through dkect or indkect interference with cell division (163). Such growth inhibitory activity is the basis for most pre- or post-emergent herbicides intended to control germinating weed seeds. In germinating seeds, cell division occurs in the meristems of the root and the shoot. Meristematic cells go through a cycle... 

Two processes are involved in plant growth, namely, cell division and cell elongation. The former process takes place only in specialized tissue, the meristematic regions, characteristically found at root and stem tips and in the buds that form leaves and flowers. Grasses, on the other hand, have a meristematic region between the leaves and the roots. During... 

As a hormone IAA has a broad range of effects on plants, altering tissue differentiation, root growth, cell elongation, and cell division.2413 The fastest observed response is an effect on cell elongation, which can be observed within 15-20 minutes.242 In A. thaliana IAA... 

North Carolina State University, Crop Sciences Department Raleigh, NC Research on the mechanism of aluminum toxicity in plants. This study will determine the extent of aluminum accumulation inside cells at the root apex using microanalytical techniques and will define associated effects on cell division, cell expansion, and cellular accumulation of calcium and magnesium. U.S. Department of Agriculture... 

Some suggest the concept that diversity of the hairy root tip—cell division, elongation, and maturation regions—is necessary for optimal growth rate (15). The best growth of root tips is consistent with the formation of new branches in maturation zones and enhancement of apical dominance (14). 

MERISTEMATIC Pertaining to undifferentiated plant tissues (e.g., root tips) that are characterized by regular, frequent cell division. 

Armbruster, B. L., Molin, W. T. and Bugg, M. W. 1991. Effects of the herbicide dithiopyr on cell division in wheat root tips. Pestic. Biochem. Physiol. 39, 110-120... 

So, these results showed a double effect of BOA on lettuce meristems an increasing significant delay in the cell cycle progression and a decrease in the mitotic index. Flow cytometry analysis showed a weak effect of BOA at cell cycle level in the step from G2 to M. BOA effect appeared to retard the cell cycle progression of treated-root meristems, which was very clear after 10 h BOA exposition (Fig. 12.5), and as an inhibition of the number of cells undergoing cell division. 

As shown by measurement of root and hypocotyl elongation, the treatment with the RO fraction did not prevent the initial absorption of water by the seed, which is essentially a passive process. However, it effectively inhibited the ensuing expansion of these organs, which results from a combination of cell expansion and cell division. As late as 46 h after seed imbibition, no sign of cell division was visible in roots from seeds treated with 1 8- and 1 10-diluted RO fraction, and only occasional divisions, mainly in the procambial area, were observed after treatment at 1 14 dilution. By contrast, control roots resumed active cell division within 16 h after imbibition. As a conspicuous consequence of the inhibition of cell expansion/division activity, the apex of roots from treated seeds appeared distinctly... 

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