Notes: Maturation of Blue Spruce Cones
Cones of eight blue spruce trees at two locations in Colorado were collected biweekly from approximately one month after initial female receptivity until natural seed shedding. Seeds were extracted and germinated in petri dishes at time of collection and microscope slides of developing ovules prepared. Germination speed and percentage peaked six weeks before natural seed release for low altitude trees (5000 ft) and four weeks before natural seed release for high altitude trees (7600-8500 ft). Peaks for both altitudes were reached about 75 to 80 days after initial female receptivity. A differentiated embryo was necessary in the ovule for germination to proceed. Forest Sci. 20:47-50.
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