Hornwort stomata do not respond actively to exogenous and environmental cues.

ABSTRACT: Backgrounds and Aims:Because stomata in bryophytes occur on sporangia, they are subject to different developmental and evolutionary constraints from those on leaves of tracheophytes. No conclusive experimental evidence exists on the responses of hornwort stomata to exogenous stimulation. Methods:Responses of hornwort stomata to abscisic acid (ABA), desiccation, darkness and plasmolysis were compared with those in tracheophyte leaves. Potassium ion concentrations in the guard cells and adjacent cells were analysed by X-ray microanalysis, and the ontogeny of the sporophytic intercellular spaces was compared with those of tracheophytes by cryo-scanning electron microscopy. Key Results:The apertures in hornwort stomata open early in development and thereafter remain open. In hornworts, the exp

SUBMITTER: Pressel S 

PROVIDER: S-EPMC6025193 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature