Comparative organization of tubulin microtubules in root cells of Zea mays (Poaceae) and Beta vulgaris (Chenopodiaceae s. str. / Amaranthaceae s. l.) under the influence of clinorotation

In order to identify the mechanism of functioning of the tubulin cytoskeleton, we have investigated the impact of clinorotation on cortical microtubules organization in the process of cell differentiation in growth zones of plant roots of Zea mays and Beta vulgaris. The similar organization of cortical and endoplasmic microtubules’ network in both species is noted. Clinorotation did not significantly change the organization of microtubules in meristem cells and the central elongation root zone. However, in the distal elongation zone of roots, both Z. mays and B. vulgaris expressed deviations of individual microtubules from the ordered transverse organization (at an angle greater than 45º). This deviation of the microtubules is likely caused by clinorotation and results in discoordination of root growth under these conditions. In addition, it has been found that the scope of destruction of the MT network by taxol in the root cells of both species is not dependent on clinorotation.