Early detection of membrane injury in black spruce (Picea mariana)
1991
Zwiazek, J.J. | Blake, T.J.
Electrolyte leakage, electrical impedance to 1 and 10 kHz alternating current, and xylem were compared to detect membrane injury in black spruce (Picea mariana (Mill.) B.S.P.) rooted cuttings after subjecting them to four levels of osmotic stress. Although relatively time-consuming, the electrolyte leakage method offered the highest sensitivity and detected injury in plants subjected to a mild stress with polyethylene glycol (15% 3350 polyethylene glycol treatment for 2 days). Change in the electrical impedance of stems subjected to 10 kHz alternating current was a less sensitive indicator of injury than the electrolyte leakage method, but it detected injury earlier than the impedance to 1 kHz current or the xylem sap osmolarity method. Early injury of plants in response to stress was poorly reflected by changes in osmotic potentials of the xylem sap expressed from shoots under high pressure.
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