Plant cell division

In plants with an elongate stem (caulescent plants), cell divisions extend far into the subapical region of the growing shoot (21), often to 1 cm. and sometimes... 

The selective toxicity of sulfonylureas to certain weeds without damage to the cereal crop arises from their rapid metabolism in the crop plant to inactive compounds, whereas in sensitive weeds the metabolism is much slower. The very high herbicidal activity suggests a specific biochemical mode of action, which is concluded to be the inhibition of plant cell division. Sulfonylureas block the enzyme acetolacetate synthase (ALS), which catalyses the biosynthesis of the essential branched chain amino acids valine, leucine and isoleucine. 

No significant effects were observed on auxin, cytokinin or gibbereilin induced cell expansion. Photosynthesis, respiration, RNA synthesis and protein synthesis were uneffected at concentrations where the plant cell division is strongly inhibited. 

Nagata, T. (2010). A journey with plant cell division reflection at my halfway stop. In Progress in Botany, Liittge, U., Beyschlag, W., Biidel, B., Francis, D. (Eds.), Vol. 71, pp. 5-21, Springer-Verlag, ISBN 978-3-642-02166-4, Berlin, Heidelberg... 

Lycorine (8) inhibits ascorbic acid synthesis (Robinson, 1979) as well as plant cell division and cell elongation (Martin, 1987). This alkaloid also inhibits DNA polymerase, protein synthesis, Rauscher virus NIH/3T3, and herpes simplex virus (Wink, 1993). 

Nemoto K, Kara M, Suzuki M, Seki H, Oka A, Muranaka T, Yoshihiro M (2009) Function of the aux and rol genes of the Ri in plant cell division in vitro. Plant Signal Behav 12 1145-1147... 

An interesting recent report showed that sodium butyrate arrests plant cell division in G2 (interphase), a response similar to that caused by sulfonylurea herbicides (26). 

Plant cells grown in suspension have a tendency to form aggregates ranging from two to thousands of cells (< 100 pm to over 2 mm) (Figure 7.6a). This is mainly due to the nature of plant cell division, in which daughter cells often remain connected... 

Finally, the 8,5 -linked lignan dehydrodiconiferyl alcohol glucoside 86 has cytokinin-like properties It induces plant cell division and can replace cytokinin in pith and callus cell cultures of tobacco (Nicotiana tabacum) (14, 15, 89),... 

Substances that cause cells, particularly lymphocytes, to undergo cell division. Mitogens are also referred to as polyclonal activators, since they stimulate proliferation of lymphocytes irrespective of their clonal origin. The best known mitogens are phytohemagglutinines isolated from certain plants. 

Several groups of drugs that bind to tubulin at different sites interfere with its polymerization into microtubules. These drugs are of experimental and clinical importance (Bershadsky and Vasiliev, 1988). For example, colchicine, an alkaloid derived from the meadow saffron plant Colchicum autumnale or Colchicum speciosum), is the oldest and most widely studied of these drugs. It forms a molecular complex with tubulin in the cytosol pool and prevents its polymerization into microtubules. Other substances such as colcemid, podophyllotoxin, and noco-dazole bind to the tubulin molecule at the same site as colchicine and produce a similar effect, albeit with some kinetic differences. Mature ciliary microtubules are resistant to colchicine, whereas those of the mitotic spindle are very sensitive. Colchicine and colcemid block cell division in metaphase and are widely used in cytogenetic studies of cultured cells to enhance the yield of metaphase plate chromosomes. 

The cell division cycle in plants. Edited by J.A. Bryant and D. Francis... 

Simon I don t think it is known. Some years ago researchers rounded up the usual suspects from yeast, complemented yeast mutants and checked for the expression patterns of factors such as the cyclins and Cdcs in plant meristems. They saw some spotty expression patterns in the meristems, but there were no clear domains of down-regulation of cell divisions, for example. 

Nurse I have a general question about the contribution of cell division to overall plant form, given that cells have invariant positions in the plant. One could imagine that the overall form of the plant is likely to be influenced by cell divisions more obviously in an animal. The plane of division and its control is very important for organism form. Would this be a reasonable view ... 

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