Bartha, Laszlo , Fodorpataki, Laszlo .
Salt stress reactions of a non-halophytic succulent plant.
Increasing salinity represents a considerable environmental stress for plants, mainly by causing water deficit and by ion toxicity due to Na+ accumulation. Salt tolerance that develops during acclimation to salt stress relies mainly on the synthesis of osmoprotectants, on sequestration of Na in the vacuoles and in the apoplast, as well as on the enhancement of antioxidative protection. Because the ability of plants to detoxify the reactive oxygen species under conditions of salt stress is a critical requirement, this study focuses mainly on the dynamics of enzymatic and non-enzymatic antioxidative systems (ascorbate peroxidase, superoxide dismutase, catalase, ascorbate) in leaves of plants exposed to different NaCl concentrations. Because drought resistance may interfere with salt stress tolerance, a succulent non-halophyte (Kalanchoe daigremontiana Ham.&Perr., formerly named Bryophyllum daigremontianum) was selected to study salt stress reactions on the background of drought resistance. Damage caused by salt stress to biomembranes was monitored by the extent of lipid peroxidation, reflected by the amount of TBARS. Changes in the relative water content, in stomatal conductance, in the chlorophyll a/b ratio and in the parameters of induced chlorophyll fluorescence, combined with variations in the reduced to oxidized ascorbic acid ratio and in the activity of reactive oxygen-scavenging enzymes offer an insight into the molecular events associated with physiological reactions to salt stress in a succulent non-halophyte with intense clonal reproduction, able to populate saline habitats.
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1 - "Babes-Bolyai" University, Biology, 1 Kogalniceanu St., Cluj-Napoca, RO-400084, Romania
2 - "Babes-Bolyai" University, Biology
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM