Influence of Brassinosteroids on the Ion-Exchange Properties of the Cell Walls of Roots and Shoots of Barley Against the Background of the Action of Heavy Metalsстатья
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Аннотация:The effect of polymetallic contamination and concomitant treatment with brassinosteroids(homocastasterone or homobrassinolide) on barley plants and on the ion-exchange capacity of cell walls isolated from shoots and roots was studied. A decrease in the dry weight of roots, water content, and the proportion of the cell wall in them was observed under the influence of polymetals, but the addition of homocastasterone to the medium led to the restoration of these parameters almost to the control level. In the aerialpart of plants, the influence of both polymetals and brassinosteroids on these parameters was weaklyexpressed. In the presence of homocastasterone, the content of demethylated carboxyl groups of polygalacturonic acid increased in the pectins of the cell walls of roots and leaves, which are the main binding sites forheavy metal ions in the apoplast. Thus, it can be assumed that treatment with brassinosteroids (homocastasterone) leads to a change in the composition and ion-exchange properties of the cell wall, which allowsone to reduce the toxic effect of polymetals due to their immobilization in the apoplast.