DISTRIBUTION OF CYTOKININS BETWEEN SHOOTS AND ROOTS OF WHEAT PLANTS TREATED WITH ZEATIN AND ZEATIN RIBOZIDE
Accumulation and distribution of cytokinins were studied after their application to wheat plants (Triticum durum Desf.) depending on the form of exogenous cytokinins (zeatin and zeatin riboside) and conditions of plants growing (in the presence and absence of sodium chloride). It was shown that 24 h after the application of zeatin riboside to plants, it was accumulated in shoots, but not in roots of plants. In plants treated with zeatin, on the contrary, cytokinins were predominantly accumulated in roots. As in case of zeatin riboside treatment, zeatin riboside was mainly accumulated in the shoots of zeatin-treated plants. The results indicated that the conjugation of zeatin with riboside contributed to cytokinin export to the shoots. Plant growing under salinity changed the distribution of cytokinins in favor of roots, which was more pronounced in the case of zeatin riboside treatment. The role of Casparian bands as a potential factor affecting the distribution of cytokinins between shoots and roots was discussed.