
 Allelopathy is a biological phenomenon by which an organism produces one or more biochemicals that influence the growth, survival, and reproduction of other organisms. These biochemicals are known as allelochemicals and can have beneficial (positive allelopathy) or detrimental (negative allelopathy) effects on the target organisms. Allelochemicals...
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http://en.wikipedia.org/wiki/Allelopathy

a characteristic of some plants according to which chemical compounds are produced that inhibit the growth of other plants in the immediate vicinity
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http://www.calflora.net/botanicalnames/botanicalterms.html

The release of chemicals by certain plants that will prevent the growing of other plants nearby. Walnut trees are very well known to do this.
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<cell biology> The deleterious interaction between two organisms or cell types that are allogeneic to each other (the term is often applied loosely to interactions between xenogeneic organisms). Allelopathy is seen between different species of plant, between various individual sponges and between sponges and gorgonians. ... (18 Nov 1997) ... ...
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a characteristic of some plants according to which chemical compounds are produced that inhibit the growth of other plants in the immediate vicinity
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http://www.encyclo.co.uk/local/21767

Influence of plants upon each other, through the release of products of metabolism that inhibit the growth of adjacent plants.
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The deleterious interaction between two organisms or cell types that are allogeneic to each other (the term is often applied loosely to interactions between xenogeneic organisms). Allelopathy is seen between different species of plant, between various individual sponges, and between sponges and gorgonians.
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A particular form of amensalism found in plants. In this interaction, one species produces and releases of chemical substances that inhibit the growth of another species.
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http://www.physicalgeography.net/physgeoglos/a.html

(Gk: allel one another; pathos suffering) the chemical inhibition of growth in one organism by another.
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http://www.seafriends.org.nz/books/glossary.htm

allelopathy, allelopathic, allelopathically The release into the environment by one plant of a substance that inhibits the germination or growth of other potential competitor plants of the same or another species.
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The suppression of growth of one plant species by another due to the release of toxic substances.
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https://www.arborday.org/trees/treeguide/glossary.cfm

A form of chemical protection in which a plant produces substances that inhibit the growth of nearby plants.
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https://www.encyclo.co.uk/local/22581

suppression of growth of a plant by a toxin released from a nearby plant of the same or another species.
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https://www.infoplease.com/dictionary/allelopathy
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