title: Stress-related levels of abscisic acid in guard cell protoplasts of Vicia faba L.
abstract: Levels of abscisis acid (ABA) were determined in isolated guard cell (GCP) and mesophyll cell (MCP) protoplasts of Vicia faba L. in relation to water stress. Incubation of GCP and MCP in 0.4 M or 0.8 M mannitol resulted in an average increase in the level of free abscisic acid (ABA) in the cells of 34% (GCP) and 38% (MCP) within 15-60 min. It is concluded that guard cell protoplasts form ABA in response to osmotic stress.
authors.affiliation: Lehrstuhl für Pflanzenphysiologie, Ruhr-Universität Bochum, Postfach 102148, D-4630, Bochum, Federal Republic of Germany.
authors.forename: E W
authors.initials: EW
authors.lastname: Weiler
authors.forename: H
authors.initials: H
authors.lastname: Schnabl
authors.forename: C
authors.initials: C
authors.lastname: Hornberg