. The Canadian field-naturalist. Germination Requirements of Alaskan Rosa acicularis R. Densmore and J. C. Zasada Institute of Northern Forestry, USDA Forest Service, Fairbanks, Alaska Densmore, R. and J. C. Zasada. 1977. Germination requirements of Alaskan Rosa acicularis. Canadian Field-Naturalist 91(1): 58-62. Abstract. Germination requirements of Alaskan seeds of Rosa acicularis, a common shrub in the boreal zone of Asia and North America, were determined from laboratory experiments and observations of germination under outdoor conditions. Germination was rapid and complete at temperatures
. The Canadian field-naturalist. Germination Requirements of Alaskan Rosa acicularis R. Densmore and J. C. Zasada Institute of Northern Forestry, USDA Forest Service, Fairbanks, Alaska Densmore, R. and J. C. Zasada. 1977. Germination requirements of Alaskan Rosa acicularis. Canadian Field-Naturalist 91(1): 58-62. Abstract. Germination requirements of Alaskan seeds of Rosa acicularis, a common shrub in the boreal zone of Asia and North America, were determined from laboratory experiments and observations of germination under outdoor conditions. Germination was rapid and complete at temperatures of 5°C to 20° C after 2 months of warm stratification and 3 months of cold stratification. Cold stratification alone or with a pretreatment of concentrated H,S04, resulted in slow and incomplete germination. Laboratory and outdoor experiments indicated that most R. acicularis seeds take 2 years to germinate. Seeds develop and mature the first growing season, warm stratify the next growing season, cold stratify the following winter, and germinate in the spring shortly after snowmelt. Suggestions are made as to the overall reproductive strategy of R. acicularis and the role of its germination requirements. Rosa acicularis Lindl. (prickly rose) occurs on a broad range of sites in the boreal zone of Asia and North America (Figure 1). In Alaska this species is common in forests and is abundant as a successional species in disturbed areas. The plant is an important food source for many animals, including microtine rodents, Figure 1. Distribution of Rosa acicularis Lindl. is outlined on the map. Seeds for this study were collected near Fairbanks, Alaska. and snowshoe hares. Fruits are also eaten by humans and are an excellent source of vitamin C. Rosa acicularis has potential as a revegetation species for disturbed areas where food for wildlife and aesthetics are important considera- tions. Little information is available in the literature on regeneration from seed in this
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