We studied the effects of ozone (O3) on the allelopathic medicinal trees/shrubs that influenced other species growing under their canopy in National Park Sochi, Russia (Caucasus region). Using model reactions, the action of rain leachates from these allelopathic trees/shrubs on the plants growing under their canopy was determined. Depending on the duration and intensity of exposure, the O3 treatment of test woody plants changed their (i) characteristics of leaves and their water extracts, (ii) colour and (iii) autofluorescence of secretory cells. Water extracts from the allelopathic woody donor plants served as model of rain leachates, and their effects were tested on the seeds and pollens germination of acceptor plants (Lavatera trimestris L. var.Rubin and Hippeastrum (Herb.) hybridum ). The effects of water extracts from the ozone treated plants differed from the untreated plants. The allelochemicals in donor plants stimulated, inhibited or had no effects on the recipient plants compared with control. The test-reactions in tropospheric ozone stress should be used in Modelling System of tree/shrub-herbaceous plants interactions, to find the allelopathic interactions in urban conditions.
Реферат. В статье приведены результаты изучения биологических особенностей различных сортов красивоцветущего кустарника Hibiscus syriacus L. На основании анализа фенологических наблюдений сорта распределены по времени начала распускания почек на начинающих: раннюю вегетацию (со II-III декады марта) 'William R.
The results of observations of 26 introduced species of trees and shrubs from the collection of the Sochi Arboretum are summarized. Information about them is not available in the specialized russian literature. A morphological description of the species, the timing of flowering and fruiting is given. The age of the plants and the sizes achieved by them are indicated. The ecological requirements of the species and the possibilities of their use are given.
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