![]() It is the official State Tree of Oregon and a hardy and well-traveled tree, which can thrive virtually anywhere in the world, provided adequate sunlight and moisture. Widely cultivated as an ornamental in Europe, Douglas Fir, with its sweet fragrance and wonderful symmetry, is cherished in America as a prime Christmas Tree species. This species has long ranked first among U.S. These long-living trees can survive to ages greater than 1,000 years, and have a rapid growth rate. The tallest Douglas Fir on record, now felled, stood almost 400 feet tall with a diameter in excess of 17 feet. Except for California's unique Sequoias, Douglas Fir grows taller and greater in girth than any other American tree. One noted naturalist called Douglas Fir "the highest expression of tree greatness in our time." Indeed, the Douglas Fir species forms some of the tallest and most magnificent forests in the world, dominating millions of square miles of wild forest in the West, from Alaska to Mexico. New Forests.Douglas Fir ( Pseudotsuga menziesii) is one of the world's most impressive trees. Effects of stem girdling on cone yield and endogenous phytohormones and metabolites in developing long shoots of Douglas-fir ( Pseudotsuga menziesii). Range-wide chloroplast and mitochondrial DNA imprints reveal multiple lineages and complex biogeographic history for Douglas-fir. Khasa, Jesús Vargas-Hernández, Javier López-Upton, Barry Jaquish, Jean Bousquet. Xiao-Xin Wei, Jean Beaulieu, Damase P. ![]() Comparative genetic responses to climate in the varieties of Pinus ponderosa and Pseudotsuga menziesii: Reforestation. Comparative genetic responses to climate in the varieties of Pinus ponderosa and Pseudotsuga menziesii: Clines in growth potential. ![]() Comparative genetic responses to climate for the varieties of Pinus ponderosa and Pseudotsuga menziesii: Realized climate niches. glauca) artificially inoculated with Armillaria ostoyae. Resistance and tolerance in juvenile interior Douglas-fir trees ( Pseudotsuga menziesii var. This region was excluded in the program’s early stages because of low site productivity however, recent increases in planting numbers combined with severe seed shortages for the area necessitated the establishment of orchards for these lands. In 2010, parent trees from southern SPZs were selected on the basis of projected climate similarity to establish new seed orchards for the Thompson Okanagan SPZ. In 2016, approximately 15.3 million (31 percent) of the 49.4 million Interior Douglas-fir seedlings scheduled for planting in B.C. ![]() Seed orchards for each SPZ were established in the North Okanagan in the early 1990s. coastal breeding program and superior submaritime seed sources growing in the 40-year-old Trinity Valley range-wide Interior Douglas-fir provenance test. The Nelson second-generation breeding population has been augmented with high breeding value parents from the B.C. ![]() Inter-varietal (Coastal/Interior Douglas-fir) hybrids have shown to be hardy and fast growing in the Nelson low elevation zone. The first-generation progeny testing program includes 1,466 open-pollinated families and 31 test sites across the six seed planning units (SPU). The second-generation crossing program focuses on the Nelson SPZ and includes selected parents from the West Kootenay, Shuswap Adams and Mica regions. Within south-central B.C.’s wide-ranging and ecologically diverse land base, six seed planning zones (SPZ) were delineated based largely on biogeoclimatic information and population genetic differentiation. The recent discovery of resistance to Armillaria root disease in Interior Douglas-fir suggests that resistance to root diseases could become an important trait of interest. The breeding goal is to improve traits related to tree size (height, diameter and volume) while maintaining wood relative density near old growth values. The Interior Douglas-fir tree breeding program began in 1982 with the objective of producing improved and genetically diverse seed for planting on productive forest land in south-central British Columbia. ![]()
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