Abstract
Di-, tri-, tetra-, penta-, and polyarch structures of the root’s central cylinder are distinguished in plants. The type of symmetry reflects typical mutual position of bundles of phloem and xylem vascular tissues in a cross section of the root. Mechanisms of the development of different types of symmetry in the central cylinder structure remain insufficiently studied. It is assumed that the process of differentiation is triggered and controlled by a phytohormone auxin (which acts as a morphogen) (Sachs, 1969). The model, which describes auxin transport through a unicellular cell layer of the root cross section, is presented in the work. Stationary distributions of auxin hormone concentrations (that can be established in the cross cell layer) were studied. It was demonstrated that nonlinear processes of auxin transport regulation are able to provide the existence of uneven distributions of its concentrations (that carry the target morphogenetic information on a diarch structure of the root cylinder). However, target morphogenetic fields always coexist with even distributions, in which morphogenetic information is absent. The results obtained indicate in favor of the hypothesis that uneven flow of auxin (of the appropriate configuration) from the sprout to the root can be one of the mechanisms of the development of the target distribution of auxin concentration in the cells of the root cross layer.
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Original Russian Text © E.S. Novoselova, V.V. Mironova, T.M. Khlebodarova, V.A. Likhoshvai, 2014, published in Vavilovskii Zhurnal Genetiki i Selektsii, 2014, Vol. 18, No. 4/2, pp. 953–962.
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Novoselova, E.S., Mironova, V.V., Khlebodarova, T.M. et al. On the distribution of auxin concentrations in root horizontal layer cells. Russ J Genet Appl Res 5, 293–299 (2015). https://doi.org/10.1134/S2079059715030120
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DOI: https://doi.org/10.1134/S2079059715030120