Dehydration Tolerance of Five Bur Oak (Quercus macrocarpa) Seed Sources from Texas, Nebraska, Minnesota, and New York

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Can. J. Forest Res.



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Dehydration tolerance was studied in saplings of five widely distributed sources of Quercus macrocarpa Michx. growing together in an outdoor plot in Lincoln, Nebraska. Membrane electrolyte leakage, expressed as percent injury, was used as a measure of dehydration tolerance. Leaves were excised from several plants of each source on July 16 after a long dry period and on August 26 after a long moist period. Leaves were allowed to dry for various times in a laboratory, their water potential was measured, and membrane injury was determined. Regressions were calculated for percent injury versus leaf water potential, so sources could be compared at selected water potentials. All sources showed increased leakage at lower water potentials, with most leakage occurring below a water potential of -3 MPa. A source from Texas had the highest leakage, 23% at -6 MPa in August, while a source from a more xeric site in north central Nebraska generally had the lowest leakage. Stress preconditioning appeared to affect leakage, with leakage often significantly lower in July than in August. Dehydration tolerance of five bur oak ( Quercus macrocarpa ) seed sources from Texas, Nebraska, Minnesota, and New York - ResearchGate. Available from: http://www.researchgate.net/publication/249533646_Dehydration_tolerance_of_five_bur_oak_(_Quercus_macrocarpa_)_seed_sources_from_Texas_Nebraska_Minnesota_and_New_York [accessed Jul 7, 2015].

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