Chemotropism of Roots

Negative fungal chemotropism to toxic metals.

Hyphal growth responses of Geotrichum candidum, Gliocladium roseum, Humicola grisea and Trichoderma viride to Cu and Cd were studied using a simple tessellated agar tile system. Negative chemotropic behaviour of hyphae, which included curling and growth away from metal-containing domains, occurred in all species and with both metals. Both toxic metal and sucrose concentrations in the medium mod...

Chemical gradients and chemotropism in yeast.

Chemical gradients of peptide mating pheromones are necessary for directional growth, which is critical for yeast mating. These gradients are generated by cell-type specific secretion or export and specific degradation in receiving cells. Spatial information is sensed by dedicated seven-transmembrane G-protein coupled receptors and yeast cells are able to detect extremely small differences in l...

A Study of Chemotropism of Pollen Tubes in Vitro.

Introduction Although much has been added to our knowledge concerning the requirements for pollen germination and pollen tube growth in recent years (1, 2, 4, 10, 17, 18), very little progress has been made in studying chemotropism of pollen tubes. Literature dealing with this subject prior to 1924 has been reviewed by BRINK (3). There is an obvious lack of agreement among the different workers...

Quantitative field studies on a carbon dioxide chemotropism of mosquitoes.

Neural Stem Cells of the Neuroepithelium Direct New-born Neurons’ Axons Electrically: Galvanotropism Precedes Chemotropism

Growing axons are directed not only by chemical signals but also by electric fields in a process known as galvanotropism. The axons of embryonic brain, spinal cord, and retina extend along the extracellular voltage gradient towards the cathode. During embryonic development neuroepithelial cells function as neural stem cells. The neuroepithelial cells have epithelial type sodium channels (ENaC) ...