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Related to allelochemicals: semiochemicals


 (ə-lē′lə-kĕm′ĭ-kəl, ə-lĕl′ə-)
A chemical emitted by an organism of one species that influences the physiology or behavior of an organism of a different species. Synthetic allelochemicals are sometimes used as herbicides or insecticides.

[Greek allēlōn, mutually (from allos, other; see al- in Indo-European roots) + chemical.]
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Host-plant adaptation also can be viewed in terms of physiological, biochemical, and evolutionary adaptations to host-plant allelochemicals (Caprio & Tabashnik 1992; Ahmad et al.
The allelopathy occurs through the release of chemical substances called allelochemicals that can act as "natural herbicides", reducing competition for resources; the release occurs through the decomposition of leaves and stems and direct exudation into the soil by the roots, among other ways.
1992) some invasive plants release allelochemicals in the environment, being in the aqueous phase of the soil or substrate, or by volatilized gaseous substances in the air surrounding soil plants.
In this context, seed germination and plantlet growth, parameters accessed by macroscopic analysis using a model plant species, are the bioassays most commonly used for study and identification of the allelopathic potential of allelochemicals extracted or present in plants (Rice, 1984).
Allelochemicals are present in both vegetative and reproductive organs of plants.
Allelopathic effects may be stimulatory or inhibitory depending upon the species involved and threshold concentrations of bioactive allelochemicals.
1999) and production of allelochemicals by the entomopathogenic nematode symbiotic bacteria complex (Grewal et al.
The mode of action of allelochemicals is extensive and is related to several metabolic processes such as photosynthesis, cellular respiration, hormonal balance, the depolarization and permeability of membranes affecting nutrient uptake, cell elongation and production of reactive oxygen species (ROS) (Gniazdowska and Bogatek, 2005; Al-Wakeel et al.
The use of allelochemicals solely or in combination with the pesticides can be a good alternative approach.
These results are in accordance to the assertions that with the absorption of water by the seed there is also allelochemicals penetration, which somehow slow down the cell division, and are related to the increase allelochemicals amount whenhigher concentration solutions are applied.
Blue gum produces a thick litter layer and allelochemicals (natural substances produced by plants that can suppress growth), which may inhibit not only its own germination, but also that of other plants (Molina et al.