title: Differential effects of abscisic acid on desiccation tolerance and carbohydrates in three species of liverworts.
abstract: Tissues of three species of in vitro grown liverworts, Riccia fluitans, Pallavicinia lyellii, and Marchantia polymorpha, were subjected to rapid drying with and without preculture for 1 week on medium containing 10 microM ABA. ABA preculture initiated total desiccation tolerance in R. fluitans, whereas control tissues were killed after 30 min of drying. Survival was also improved in P. lyellii, whereas ABA did not affect survival of M. polymorpha after rapid drying. ABA treatment did, however, reduce the rate of water loss in M. polymorpha. Total soluble carbohydrates were increased in ABA-treated R. fluitans and P. lyellii, but not in M. polymorpha, although there was no correlation between survival and changes in the percentage of these carbohydrates as reducing sugars. These differences in response to ABA and desiccation likely reflect different adaptations of these three species to conditions in situ.
authors.affiliation: Center for Conservation and Research of Endangered Wildlife, Cincinnati Zoo & Botanical Garden, OH 45220, USA. valerie.pence@cincinnatizoo.org
authors.forename: Valerie C
authors.initials: VC
authors.lastname: Pence
authors.forename: Susan S
authors.initials: SS
authors.lastname: Dunford
authors.forename: Steven
authors.initials: S
authors.lastname: Redella
mesh_terms: D000040:Abscisic Acid / Q000502:physiology*; D000222:Adaptation, Physiological; D050260:Carbohydrate Metabolism; D003470:Culture Media; D003890:Desiccation; D035926:Hepatophyta / Q000502:physiology*; D066298:In Vitro Techniques; D047008:Marchantia / Q000502:physiology; D014867:Water / Q000502:physiology
chemical_list: D003470:Culture Media; D014867:Water; D000040:Abscisic Acid