INFLUENCE OF CYCLOPENTANE β,β'-TRIKETONES ON THE ULTRASTRUCTURE OF ROOT CAP MERISTEMATIC CELLS OF
CUCUMIS SATIVUS L. SEEDLINGS
A. V. Reunov,1 L. A. Lapshina, K. A. Dyomina, O. P. Shestak, M. M. Anisimov, V. L. Novikov
Pacific Institute of Bioorganic Chemystry Far East Branch of RAN, Vladivostok;
1 e-mail: antreunov@mail.ru
The influence of cyclopentane β,β'-triketones on the ultrastructure of root cap meristematic cells of Cucumis
sativus L. under inhibition of root growth by these compounds was studied. It was shown that treatment of
the seedlings by these substances at the concentration of 100 μg/ml caused, on the one hand, stimulation of protein-
synthesizing apparatus (increase in the nucleolus size and in the number of mitochondria and rough endoplasmic
reticulum membranes) and, on the other hand, stimulation of lytic processes. The fact that the used compounds,
causing inhibition of the seedling growth, do not suppress but stimulate protein-synthesizing activity of
the cells, according to existing concept, testifies to the compound-mediated induction of the cell resistance to
unfavourable factors. Consequently, these compounds, in contrast with growth inhibitors suppressing cell metabolism
completely, possess properties peculiar to retardants, growth inhibitors valuable for crop production.
Key words: Cucumis sativus, cyclopentane β,β'-triketones, growth regulators, retardants, root cap, meristematic
cells, ultrastructure
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