ULTRASTRUCTURE OF ROOT CUP MERISTEMATIC CELLS OF CUCUMIS SATIVUS L. SEEDLINGS
UNDER INHIBITION OF ROOT GROWTH BY SYNTHETIC CYCLOPENTENE β,β'-TRIKETONE
A. V. Reunov,1 L. A. Lapshina, M. M. Anisimov, V. V. Logachev, O. P. Shestak,
V. L. Novikov
Pacific Institute of Bioorganic Chemistry, the Far East Branch of RAS, Vladivostok, Russia;
1 e-mail: piboc@stl.ru
A study was made of the ultrastructure of root cap meristematic cells in the seedlings of Cucumis sativus L.,
whose growth was inhibited by the action of 2-acetyl-4-metylcyclopent-4-en-1,3-dione (AMCD). It is shown that the treatment of seeds
by this substance at a concentration of 100 (μg/ml leads to the main root inhibition by 73 % and, as compared to the control,
causes the highest changes in mitochondria that do not reach normal dimensions and undergo degeneration. AMCD caused significant
changes in the cell walls that in test samples unusually became electron-dense. Deposits of osmiophylic substance, presumably
consisting of terpenoid-like compounds, were often found in the cytoplasm of treated cells as well as in the extracellular space. In many
cells, plasmalemma and amiloplast membranes underwent destructive changes. We discuss a possible relation between inhibitory
effect of AMCD on the root growth, and its influence on the ultrastructure in investigated cells.
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