Seeds of greasewood (Sarcobatus vermiculatus (Hook.) Torr.) were germinated at 5 degrees to 40 degrees C in 5-degree increments to determine temperature response. Seeds were also germinated in solutions of polyethylene glycol 6,000 (PEG), NaCl, and Na2 SO4, each at osmotic potentials of 0 to -4.2 MPa in -0.3 MPa decrements at 10, 20 and 30 degrees C to determine moisture stress, specific ion, and temperature interaction. Germination was high at all temperatures, 5 degrees C through 25 degrees C being optimal. A direct linear relationship existed between total germination and osmotic potential of each solution at each temperature. Mean germination at 30 degrees C was significantly different for each osmotica with NaCl highest and PEG lowest. Mean germination at 10 degrees C and 20 degrees was not different within osmotica; however, total germination was significantly lower in PEG than in NaCl and Na2SO4, indicating the difference between macromolecular PEG and ions (NA+, Cl-, and SO4=). Significant difference was observed in the coefficient of rate of germination between ions of Cl- and SO4=, with SO4= being more stressful. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.