THE EVALUATION OF ALLELOPATHIC COMPOUNDS ACTION IN AILANTHUS ALTISSIMA ON SOME OF THE BROAD-LEAVED SPECIES PUBLISHEDCristian BOSTAN, Alexandra CAZAN, Florian BORLEA
Our primay focus was to assess the tolerance of local broad-leaved species such as Acer platanoides and Quercus cerris to the effect of aqueous extracts of Ailanthus altissima. This type of assessment has been chosen because of the increasinngly developing species that visibly colonize a wide range of habitats, often with prolific populations in forest ecosystems and protected areas, affecting through dynamics and influence the local species that it lives and shares the habitat with. The rapid growth and prolific reproduction through both sexual and vegetative contribute to its success as invasive species, but the large amount of biochemical substances present in all plant tissues suggest that allelopathy is another mechanism that gives the species Ailanthus altissima invasiveness. The study was founded in greenhouses, under the study of "Plant Physiology" at the Faculty of Agriculture Timisoara (Romania) under controlled conditions of humidity, temperature and light. The plant material used in bioassays consisted in roots of A. altissima and seedlings of Acer platanoides and Quercus cerris, in the 2-4 leaf stage. The obtained solutions were considered the reference and were prepared in three different doses: version 1 (V1) - 5 ml / seedling; Version 2 (V2) - 10 ml / seedling; Variant 3 (V3) - 20 ml / seedlings. The experience was maintained for 25 days, during which time the plants were treated with the extracts obtained, the following determinations were performed: plant height; number of leaves / plant; leaf area; chlorophyll content. By applying the extracts, the following have occurred: proportionally to the amount of extract applied: reducing the number of leaves, decreasing the content of chlorophyll, the beginning of chlorosis, the lack of their development overt the time, reduced leaf area and the appearance of necrosis, partial or total drying plant. Based on these results, we can preliminary conclude that A. altissima, based on the allelopathic compounds that it provides, may replace local species in natural ecosystems, representing a problem for present and the future of biodiversity.
Ailanthus altissima, broad-leaved species, allelopathic compounds, aqueous extracts