title: [Characteristics of wheat powdery mildew growth along and across the longitudinal axis of a leaf under the action of exogenous zeatin].
abstract: Scanning electronic microscopy was used to investigate the regularities of growth direction of infectious structures and colonies of the agent of powdery mildew of wheat Erysiphe graminis f. sp. tritici. The growth of appressoria with normal morphology in wheat leaves occurs predominantly along the long axis of the cell. Most anomalous appressoria grow perpendicularly. Treatment with zeatin changes the ratio of the directions of growth of normal appressoria and hyphae of the colonies. The dependence of these parameters and of the surficial density of colonies on the concentration of phytohormone is monophasic. The hypothesis is suggested that the strategy of selection of the direction of growth of infectious structures on leaves with an anisotropic surface depends on the most probable position of the receptor cell and the action of cytokinins on their participation in redistribution of nutrients between the infected and noninfected cells of the host plant.
authors.forename: A S
authors.initials: AS
authors.lastname: Riabchenko
authors.forename: T V
authors.initials: TV
authors.lastname: Avetisian
authors.forename: A V
authors.initials: AV
authors.lastname: Babosha
mesh_terms: D001203:Ascomycota / Q000187:drug effects* / Q000254:growth & development / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D010935:Plant Diseases / Q000382:microbiology* / Q000517:prevention & control; D010937:Plant Growth Regulators / Q000494:pharmacology*; D018515:Plant Leaves / Q000254:growth & development / Q000382:microbiology / Q000648:ultrastructure; D014908:Triticum / Q000187:drug effects / Q000382:microbiology* / Q000648:ultrastructure; D015026:Zeatin / Q000494:pharmacology*
chemical_list: D010937:Plant Growth Regulators; D015026:Zeatin