Insect juvenile hormone analogs in conifers. III. Variability of Douglas-fir wood extractives with geographical location

1977 ◽  
Vol 7 (2) ◽  
pp. 429-434 ◽  
Author(s):  
John F. Manville ◽  
Ian H. Rogers
Keyword(s):  
Juvenile Hormone ◽  
Lignin Content ◽  
Geographical Location ◽  
Douglas Fir ◽  
Extractive Content ◽  
Hybrid Index ◽  
Strong Negative Correlation ◽  
Juvenile Hormones ◽  
Hormone Analogs ◽  
Branch Wood

Cores, branch wood, and foliage samples were taken from five healthy Douglas-fir trees at each of 20 sites across southern British Columbia, ranging from central Vancouver Island to the western slopes of the Rocky Mountains. Hybridization values for each tree were established by von Rudloff, based on the composition of the foliage essential oil. Branch wood samples and cores from bole wood were analyzed for lipophilic extractives content; the presence of juvabione-type insect juvenile hormone analogs (IJHA) was noted. A strong negative correlation was noted between lignin content and a hybrid index and a strong positive association between lignin content and diameter. There was a strong positive relationship between extractive content and age. Juvenile hormones were most commonly found in trees of the coastal and coastal intermediate subvariants. Branch wood and bole wood samples usually gave comparable results for the presence of the juvenile hormones.

Juvenile Hormone Analogs in Conifers. II. Isolation, Identification, and Biological Activity of cis-4-[1′(R)-5′-Dimethyl-3′-oxohexyl]-cyclohexane-1-carboxylic Acid and (+)-4(R)-[1′(R)-5′-Dimethyl-3′-oxohexyl]-1-cyclohexene-1-carboxylic Acid from Douglas-fir Wood

1974 ◽  
Vol 52 (7) ◽  
pp. 1192-1199 ◽  
Author(s):  
I. H. Rogers ◽  
J. F. Manville ◽  
T. Sahota
Keyword(s):  
Carboxylic Acid ◽  
Methyl Ester ◽  
Juvenile Hormone ◽  
Methyl Esters ◽  
Petroleum Ether Extract ◽  
Douglas Fir ◽  
Ether Extract ◽  
Biological Assays ◽  
Hormone Analogs ◽  
Derivatives Of

The petroleum ether extract from the whole-wood meal of a number of British Columbia Interior-Intermediate variety Douglas-fir trees have yielded two carboxylic acids (+)-todomatuic acid (3b) and cis-dihydrotodomatuic acid (4b) which as their methyl esters are potentially useful juvenile hormone analogs. These compounds possess the R,R and R stereoconfigurations, respectively. The configuration at C-1′ is opposite to that reported by others for "(+)-juvabione" isolated from Abiesbalsamea grown in Czechoslovakia. Whereas (+)-juvabione naturally occurs as and is the methyl ester of (+)-todomatuic acid (4b), in this variety of Douglas-fir these compounds appear as the free acids. Results of biological assays on certain insects indicate that the methyl ester derivatives of these acids are effective ovicides and juvenilizing hormones.

EFFECTS OF ECDYSONES, JUVENILE HORMONE ANALOGS, AND 6-OXOOCTANOIC ACID ON THE DEVELOPMENT OF THE MOSQUITO, CULEX TARSALIS (DIPTERA: CULICIDAE)

1974 ◽  
Vol 106 (1) ◽  
pp. 79-85 ◽  
Author(s):  
P. I. Ittycheriah ◽  
M. S. Quraishi ◽  
E. P. Marks
Keyword(s):  
Juvenile Hormone ◽  
Topical Treatment ◽  
Adult Emergence ◽  
Fourth Instar ◽  
Culex Tarsalis ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
High Doses ◽  
Hormone Analogs ◽  
Very High

AbstractEggs, larvae, and pupae of Culex tarsalis Coquillett were treated with ecdysones, juvenile hormone analogs, and 6-oxooctanoic acid. Effects of these agents on mortality, induction of supernumerary stages, and adult emergence were determined. Topical treatment of eggs with CRD9499 (a juvenile hormone analog), β-ecdysone, and 22-isoecdysone caused a reduction in adult emergence. Treatment of fourth-instar larvae with these chemicals not only induced mortality but also caused the formation of supernumerary intermediate stages. Larvae of C. tarsalis were very susceptible to CRD9499, but pupae were resistant. The ecdysones caused some mortality but only at very high doses and would thus be of little use as larvicides. 6-Oxooctanoic acid caused high rates of mortality at 0.001 M concentrations.

Estimating branch production in trembling aspen, Douglas-fir, jack pine, black spruce, and balsam fir

2007 ◽  
Vol 37 (6) ◽  
pp. 1024-1033 ◽  
Author(s):  
P.Y. Bernier ◽  
M.B. Lavigne ◽  
E.H. Hogg ◽  
J.A. Trofymow
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Black Spruce ◽  
Jack Pine ◽  
Douglas Fir ◽  
Balsam Fir ◽  
Trembling Aspen ◽  
Wood Production ◽  
Conifer Species ◽  
Branch Wood

Measuring net primary productivity of trees requires the measurement of total wood production of branches. Recent work on balsam fir ( Abies balsamea ) has shown that branch-wood production can be estimated as a function of foliage production. We extend the analysis to four other species found in the Canadian forest: black spruce ( Picea mariana ), jack pine ( Pinus banksiana ), Douglas-fir ( Pseudotsuga menziesii ), and trembling aspen ( Populus tremuloides ). Results show that the ratio of annual branch-wood production to annual foliage production is about 1.0 for conifer species (between 0.86 and 1.12) and 0.56 for aspen during a nondrought year. An analysis using field measurements of litterfall and stem-diameter increment from selected forested sites shows that branch-wood production accounts for a smaller proportion of aboveground net primary productivity in trembling aspen (15%–20%) than in conifer species (25%). Also, litterfall capture of small branches (<1 cm diameter) accounts for only 33% of branch detritus production in conifers and 50% in trembling aspen. This study supports the use of an alternative method for estimating branch-wood production that reduces the potential bias in field estimates of net primary productivity.

Effect of habitat and substrate quality on Douglas fir litter decomposition in western Oregon

1977 ◽  
Vol 55 (12) ◽  
pp. 1632-1640 ◽  
Author(s):  
Robert Fogel ◽  
Kermit Cromack Jr.
Keyword(s):  
Lignin Content ◽  
C:N Ratio ◽  
Growth Index ◽  
Moisture Stress ◽  
Douglas Fir ◽  
Linear Regression Models ◽  
Female Cone ◽  
Substrate Quality ◽  
Woody Litter ◽  
Plant Moisture

Linear regression models were developed for Douglas fir needle, female cone, branch, and bark decomposition in seven stands representing four mature vegetation types in western Oregon. Rate constants (k) for annual weight loss of needles ranged from 0.22 to 0.31 year−1, from 0.047 to 0.083 year−1 for cones, from 0.059 to 0.089 year−1 for branches, and from 0.005 to 0.040 year−1 for bark. The decomposition constant (k) of needles had a negative linear correlation (P < 0.01) with maximum plant moisture stress and temperature growth index of the seven stands. In comparing substrate quality of needle and woody litter components, k was more closely correlated with lignin content than with C:N ratio.

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