Özet:

Allopathic effects among plants are of considerable importance in existence of different ecosystems, regulating of biodiversity and sustainability in natural environments. Certain biochemicals especially synthesized in medicinal plants inhibit or promote the growth and development of other plants in surrounding environment. This study was carried out with the aim of determining allopathic effect of certain medicinal plants widespread in the Black Sea region of Turkey. The effects of leaf extracts of nettle, black cabbage and rhododendrons with purple and yellow flower in different concentrations (0, 5%, 10%, and 20%) on seed germination and seedling growth of maize, soybean and sunflower were investigated. In accordance with increasing extract doses, very significant decreases were observed in seed germination and seedling growth of maize, soybean and sunflower as compared to the control treatment. The inhibitory effect of increasing extract doses varied rather significantly according to plant source of the extract and the inhibitory effects of nettle and black cabbage were much pronounced than those of purple and yellow flowered rhododendron. In all test plants, inhibitory effects of the leaf extracts on seed germination and seedling growth were in the order of nettle > black cabbage > purple flowered rhododendron > yellow flowered rhododendron. The treatments of 20% nettle and black cabbage leaf extracts completely inhibited seed germination and seedling growth of soybean and sunflower. In conclusion, these results indicate that leaf extracts of nettle and black cabbage have strong allopathic effects on seed germination and seedling growth in maize, soybean and sunflower.

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