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A biological phenomenon in him which one organism produces secondary metabolites that have either beneficial (positive) allelopathy or detrimental (negative) allelopathy on target organisms.

Examples of organisms displaying allelopathy
Plants, algae, bacteria, coral and fungi. These interactions influence species distribution and abundance within plant communities and ecosystems.

allelopathy (l·lēˑ·l·pa·thē),

n the system of natural defenses that protects one plant species from others around it.
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The use of embryo extract (T2) of sweet passion fruit seeds reduced the germination percentage and the germination speed index of lettuce seeds, indicating allelopathic interference of compounds of sweet passion fruit seeds on lettuce germination (Table 1).
There are two evolutionary advantages to resin gland abscission; natural allelopathic competition with other plants, and increased dispersal of its seeds by humans.
The allelopathic effect depended upon the extract concentration, target species, and the plant tissue from which the allelochemicals were extracted (GNIAZDOWSKA; BOGATEK, 2005; HAO et al.
Potential allelopathic effects of Brazilian pepper (Schinus terebinthifolius Raddi, Anacardiaceae) aqueous extract on germination and growth of selected Florida native plants.
This measure may provide greater availability of nutrients, greater presence of straw on the soil surface and less possible release of allelopathic substances to the soil (Weston, 1990; Barbosa et al.
1] of MC-LR, showed that this toxin may have a possible allelopathic action (Pflugmacher, 2002).
Use of allelopathic methods of weed control instead of chemical pesticides can reduce environmental pollution and this is the most important reasons for conducting research such as this.
Both the root and shoot extracts of three allelopathic grasses, namely, Dicanthium annulatum, Cenchrus pennisetiformis, and Sorghum halepense, reduce germination and suppress early seedling growth of exotic weed P.
The density of all the weeds was significantly suppressed by the allelopathic crop leachates treatment in the range of 20-30% except Dactyloctenum aegyptium L.
Allelopathic effects of different Amaranthus species on various plants have been reported (Table 5).
Comparing with native species, most invasive plants showed inherent competitive advantage and performance in novel environments by allelopathic compounds effects, higher resource uptake, faster growth rates, or by release from specialist natural enemies (Callaway and Ridenour, 2004; Qin et al.