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Seed germination of common weed species as affected by oxygen concentration, light, and osmotic potential

Published online by Cambridge University Press:  20 January 2017

Nathan Boyd  and
Rene Van Acker
Rene Van Acker
Affiliation:
Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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Abstract

Laboratory experiments were conducted to determine the effects of oxygen concentration (21, 10, 5, and 2.5%), exposure to light, and osmotic potential on the germination of wheat, canola, and various weed species. Germination of most species increased as osmotic potential was increased. Seed germination for some species like barnyardgrass was inhibited by the combination of exposure to normoxic (21% oxygen) conditions and light. This combination of conditions may function as a signal to prevent soil surface germination. Wild mustard germination increased with increasing oxygen concentration when seeds were not exposed to light, whereas green foxtail germination was relatively insensitive to oxygen concentration. Wild oat germination increased with increasing osmotic potential, and osmotic potential had a greater influence when the seeds were exposed to light. Dandelion, foxtail barley, curly dock, and perennial sowthistle germination was affected more by osmotic potential and light exposure than by oxygen concentration. A better understanding of the mechanisms of depth detection for specific species will lead to a better understanding of their recruitment biology. This information may help model the potential for invasion and proliferation of each species as well as devise improved management strategies.

Keywords

Barnyardgrass, Echinochloa crus-galli L. ECHCGcatchweed bedstraw, Galium aparine L. GALAPcurly dock, Rumex crispus L. RUMCRdandelion, Taraxacum officinale Weber TAROFfoxtail barley, Hordeum jubatum L. HORJUgreen foxtail, Setaria viridis (L.) Beauv. SETVIperennial sowthistle, Sonchus arvensis L. SONARwild mustard, Brassica kaber (D.C.) L. C. Wheeler SINARwild oat, Avena fatua L. AVEFAcanola, Brassic napus L. ‘Liberty’spring wheat, Triticum aestivum L. ‘AC Barrie’Hypoxiaphotoinductionweed germination
Type
Weed Biology and Ecology
Information
Weed Science , Volume 52 , Issue 4 , August 2004 , pp. 589 - 596
Copyright
Copyright © Weed Science Society of America 

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References

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