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Effect of Osmotic Water Stress on Germination and Initial Development of Ponderosa Pine Seedlings

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Seeds were subjected to three pregermination treatments--soaked in water 24 hours, alternately wetted and dried five times, and air-dried (control treatment)--then germinated on paper toweling saturated with graded polyethylene glycol (PEG-400) solutions made up to provide osmotic potentials of 0, -3, -7, -11, and -15 bars. Seedlings were watered with one of the five PEG-400 solutions with nutrients added. Air-dried seeds germinated as well as alternately wetted and dried, and significantly better than 24-hour soaked seed at 0, -3, and -7 bars. Osmotic potentials below -7 bars greatly depressed germination within all pretreatments. In general, root penetration, root dry weight, and cotyledon length decreased with decreased osmotic potential of the soil solution. Seedlings that germinated at low osmotic potentials grew poorly even when watered with solutions of high osmotic potential.

Keywords: Pinus ponderosa; polyethylene glycol; seed treatment

Document Type: Journal Article

Affiliations: Principal Silviculturist, Rocky Mountain Forest and Range Expt. Sta., Forest Service, U. S. Dept. of Agric., with central headquarters maintained at Fort Collins in cooperation with Colorado State University

Publication date: 1969-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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