Co-Authors:
Malki, E., Dept of Botany, George S. Wise Faculty of Life Sciences, Tel Aviv Univ, Tel Aviv, 69978, Israel
Waisel, Y., Dept of Botany, George S. Wise Faculty of Life Sciences, Tel Aviv Univ, Tel Aviv, 69978, Israel
Pesis, E., Inst. for Technology and Storage of Agricultural Products, ARO, P.O. Box 6, Bet Dagan, 50250, Israel
Abstract:
Germinated wheat seeds (Triticum aestivum L. cv. Barqai) that had been subjected to short hydrostatic pressure treatments (0.3–1.2 MPa) changed their normal metabolism into one which is characterized by a high ethanol production, a low O2 consumption and a low CO2 evolution. Alcoholic fermentation could account for ca half of the CO2 evolved from the pressurized seeds. The level of acetaldehyde was low, though significantly higher in the pressurized seeds than in the controls. Subjection of wheat seeds to osmotic stress under aerobic conditions lowered their O2 uptake and CO2 evolution but did not induce ethanol production. Exposure of pressurized seeds to NaCl stress did not alter their ethanol production beyond that which had been induced by pressure. Ethanol production by pressurized seeds increased following either the addition of sucrose or by excision of the embryos from the endosperms. More electrolytes leaked into the embedding solution from pressurized seeds than from control seeds. Exogenous ethanol was toxic to wheat seeds at concentrations as low as 343 mM. The effects of hydrostatic pressure and of the consequently induced ethanol production on the mortality of flooded seeds is discussed. Copyright © 1989, Wiley Blackwell. All rights reserved
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