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Germination response of curlycup gumweed seed to oxygenated water treatment

ABSTRACT:Seed germination in an oxygenated water bath has been shown to be effective at reducing or eliminating dormancy barriers of some native western North American plant species; however, its full utility is not known. Particularly lacking is information on the effects of oxygenated water treatments on native forbs with physiological dormancy. Curlycup gum-weed (Grindelia squarrosa (Pursh) Dunal [Asteraceae]) is a commonly occurring, early seral forb that is native to arid and semi-arid habitats in the Intermountain West and is used in wildlife habitat and other rangeland planting practices. We compared germination rates and final germination percentage of curlycup gumweed collections from 5 locations in the Intermountain Region exposed to 4 germination treatments: 1) oxygenated water bath; 2) non-oxygenated water bath; 3) 90-d cold-moist stratification; and 4) a non-treated control. Germination rates and final germination percentages after 35 d in oxygenated water bath treatments were equal to or greater than those from the 90-d stratification for all 5 accessions. Seed priming in oxygenated water treatments appears to be feasible for quickly and uniformly germinating seed in a laboratory environment with the possibility of expanding the technique for field settings.