Pseudotsuga

The coastal race conforms to P. menziesii var. menziesii, whereas the inland races accord well with P. menziesii var. glauca (Beissn.) Franco, the form known from the Rocky Mountains. There is no established morphological equivalent to the Sierra Nevada race trees from that area are usually referred to var. menziesii. Zavarin and Snajberk (1975), however, sununarized differences between trees harvested in the Sierra Nevada Mountains and those harvested in northwestern California with regard to commercial applications, particularly in the manufacture of plywood or the production of composite materials (particle board). Differences in such factors 

The third paper in this set Zavarin and Snajberk (1976) described their efforts to detect chemical races within big cone Douglas fir. Analysis of the cortical monoterpenoid fraction of 33 trees revealed that the major component was a-pinene, with P-pinene, 3-carene, and limonene present in lesser amounts. The monoterpene profiles of different populations varied somewhat from each other, but the overall profile of big cone Douglas fir was clearly different from that of Douglas fir. There was no evidence for gene flow between the southernmost population of Douglas fir at Lompoc and the closest population of big cone Douglas fir at Figueroa, sites separated by only 34 km. 

Foliage of Douglas fir had only trace amounts of (+)-camphene in trees from the coast but major concentrations in trees from the other three sites, hi contrast, ter-pene mixtures from lodgepole pine leaf and bole tissues had nearly the same levels of the major compound, (-)-P-phellandrene, and minor components regardless of origin. Patterns of variation in the other species were less extreme. 

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Four different syntheses were reported for the enantiomers of l-methyl-2-cyclohexen-1 -ol, a component of the aggregation pheromone of Dendrocton us pseudotsugae [47-50]. 

In 1918 Miss Helene M. Boas, of the New York Botanical Garden, sent to the writer a sample of manna which had been collected by James A. Teit near Spence s Bridge, British Columbia, from Douglas fir trees (Pseudotsuga taxifolia Brit., syn. P. Douglasii Carr.). The dry, white, crystalline manna (42.5 g.), in which some small stems and needles of the tree (4 g.) were encrusted, was entirely soluble in water and it proved to consist principally of melezitose.17 The authors stated that if the manna can be obtained in large quantities, which appears to be the case, it will indeed furnish an excellent source for melezitose. However, there was found within a few months by the same workers an abundant... 

Fig. 1.—John Davidson s specimen of Pseudotsuga Douglasii, with exudation of sugar from water-pores at tips of leaves. ...

From fir (Abies sp., Pseudotsuga menziesii) forest sprayed aerially with 140 or 280 mg/ha to control Douglas-fir tussock moth effects evaluated in year of spraying and 1 year later... 

Flavonol truxinix esters with possible myorelaxant activity were determined in Pseudotsuga menziesii using various TLC stationary and mobile phases. Because of chemotaxonomical interest the same investigations were carried out on 34 species from the family of Pinaceae. Dried and pulverized needles were exhaustively extracted with chloroform followed with methanol. The chloroform fraction was evaporated to 5 ml and... 

M. Krauze-Baranowska, I. Malinowska and J. Skwierawska, TLC of flavonol truxinic esters from Pseudotsuga menziesii. J. Plan. Chromatogr.—Mod TLC 15 (2002) 437 441. 

Dihydroflavonol 4-reductase (DFR EC 1.1.1.219) is a member of the short-chain dehydrogenase/reductase family and catalyzes the stereospecific conversion of (+)-(2R,3R)-dihydroflavonols to the corresponding (2R,3S,4S) flavan-3,4-cw-diols (leucoanthocyanidins), with NADPH as a required cofactor. The enzyme activity was first identified in cell suspension cultures of Douglas fir (Pseudotsuga menziesii) and was shown to be related to the accumulation of flavan-3-ols and proanthocyanidins [96]. Leucoanthocyanidins and DFR were later shown to be required for anthocyanidin formation by complementation of Matthiola incana mutants blocked between dihydroflavonol and anthocyanidin biosynthesis [97, 98], DFR has been purified to apparent homogeneity and biochemically analyzed from flower buds of Dahlia variabilis [99]. DFR was shown to accept different substrates depending on the plant species from which it was isolated (reviewed in 100). 

Scapania undulata GYMNOSPERMAE Pinaceae Abies, Picea, Pinus, Pseudotsuga, Tsuga Cell walls Riccionidin A (522), riccionidin B 81 (1994)... 

DiOH-7-OMe 6-Me C17H16O5 300 6-Methylsakuranetin Pseudotsuga wilsoniana Pinaceae Heartwood 58... 

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