PJB-2011-376
ALLELOPATHIC EFFECTS OF ACACIA TORTILIS (FORSSK.) HAYNE SUBSP. RADDIANA (SAVI) BRENAN IN NORTH AFRICA
ZOUHEIR NOUMI* AND MOHAMED CHAIEB
Abstract
Allelopathic and autotoxicity effects of aqueous extracts from under the canopy soil and from different parts of Acacia tortilis subsp. raddiana were studied. These effects were measured in terms of germination rate and radicel length of barley (Hordeum vulgare), softwheat (Triticum sativum L.) and hardwheat (Triticum aestivum L.) with two varieties and Acacia tortilis. The experiments were conducted in the dark at an average temperature of 25°C for cereal species and 30°C for Acacia seeds which represents the optimum temperature of germination. Different extracts (from soil under canopy, leaf, fruit, shoot and root) significantly reduced germination and seedling growth of the tested species. However, this allelopathic effect varied with the extract source. The inhibitory effect was more pronounced in fruit and leaf extracts compared with root, shoot and soil extracts. These results strongly suggest that allelopathy may be a possible mechanism controlling the timing of cereal and Acacia tortilis germination and seedling establishment.
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