Cytological study of inhibitory effects of IAA on the root growth in the Pinus silvestris.
It has been found that IAA at the concentrations 0.1--10.0 ppm retards the pine root growth and decreases mitotic activity. All the applied concentrations of this hormone cause a decrease of the 3H-thymidine incorporation index and inhibit endomitotic polyploidization in suprameristematic segments. The mean time of the cell cycle prolongs and the heterogeneity of cellular populations increases in parallel with the increase of IAA concentration. The template activity of DNA decreases under the influence of the applied concentrations of IAA; this effect is being particularly strong in the meristematic root segment. IAA exerts also an inhibitory influence on protein synthesis, especially reducing the synthesis of histones.
D004247:DNA / Q000096:biosynthesis; D007210:Indoleacetic Acids / Q000494:pharmacology*; D008938:Mitosis / Q000187:drug effects; D063245:Plant Development; D010937:Plant Growth Regulators / Q000494:pharmacology*
D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D004247:DNA