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Orientation response of a sessile organism with reference to chemical stimuli.



change in the direction of growth of plant organs under the influence of chemical substances acting in one direction. Like other tropisms, chemotropism results from the uneven growth of opposite sides of an organ. Many substances that stimulate positive chemotropism in low concentrations (growth of organs in the direction of the chemical stimulus) may cause negative chemotropism in high concentrations (growth of organs in the direction opposite the stimulus). Chemotropism occurs in the growth of pollen tubules toward the ovules, in the penetration of the tissue of the host plant by the hyphae of parasitic fungi, and in the growth of roots toward particles or granules of fertilizer.

References in periodicals archive ?
Chemotropic guidance facilitates axonal regeneration and synapse formation after spinal cord injury.
The cercariae are motile, and are phototropic and chemotropic, meaning they respond to changes in light and chemical stimuli they are especially attracted by chemicals found on mammalian skin.
As the dipolar relaxation time constant of water molecules in the hydration shell is different from that in bulk water, the hydration shell absorption will be lower or higher compared to bulk water depending on whether the biomolecule is chemotropic (slower water molecules in the hydration shell) or chaotropic (faster water molecules in the hydration shell).
According to the literature, the salt guanidine thiocyanate is one of the most powerful chemotropic agents and is commonly used in the Boom method.
Lysis buffers based on chemotropic agents such as guanidine salts, however, interfere with subsequent hybridization and target capture.