Christmas trees in the small woodland

Revised April 1985. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Christmas trees in the small woodland

Published May 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Developing sheared Douglas-fir Christmas trees [1992]

Over the past 30 years, Christmas trees have become an intensively managed horticultural crop. During this period, higher standards and increasing competition have given the edge to growers who are progressive and highly motivated. Whether you’re a large or small producer, your trees must have consistently high quality for successful marketing.Published March 1992. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Gibberellin Concentration and Transport in Genetic Lines of Pea : Effects of Grafting

Effects of the Na and Le loci on gibberellin (GA) content and transport in pea (Pisum sativum L.) shoots were studied. GA(1), GA(8), GA(17), GA(19), GA(20), GA(29), GA(44), GA(8) catabolite, and GA(29) catabolite were identified by full-scan gas chromatography-mass spectrometry in extracts of expanding and fully expanded tissues of line C79-338 (Na Le). Quantification of GAs by gas chromatography-single-ion monitoring using deuterated internal standards in lines differing at the Na and Le alleles showed that na reduced the contents of GA(19), GA(20), and GA(29) on average to <3% and of GA(1) and GA(8) to <30% of those in corresponding Na lines. In expanding tissues from Na le lines, GA(1) and GA(8) concentrations were reduced to approximately 10 and 2%, respectively, and GA(29) content increased 2- to 3-fold compared with those in Na Le plants. There was a close correlation between stem length and the concentrations of GA(1) or GA(8) in shoot apices in all six genotypes investigated. In na/Na grafts, internode length and GA(1) concentration of nana scions were normalized, the GA(20) content increased slightly, but GA(19) levels were unaffected. Movement of labeled GAs applied to leaves on Na rootstocks indicated that GA(19) was transported poorly to apices of na scions compared with GA(20) and GA(1). Our evidence suggests that GA(20) is the major transported GA in peas