A ROOT-ROT OF DOUGLAS FIR CAUSED BY PORIA WEIRII

1940 ◽  
Vol 18c (10) ◽  
pp. 522-533 ◽  
Author(s):  
Irene Mounce ◽  
J. E. Bier ◽  
Mildred K. Nobles
Keyword(s):  
Root Rot ◽  
Vancouver Island ◽  
Douglas Fir ◽  
Thuja Plicata ◽  
Close Resemblance

A laminated root-rot of Douglas fir [Pseudotsuga taxifolia (Lamb.) Britt.] occurs in young stands on Vancouver Island, B.C. The decay, the sporophore associated with it, and the cultural characters of the fungus are described A comparison with Poria Weirii Murr., previously reported only on Thuja plicata (D Don.), shows a close resemblance in all respects between the two fungi.

Restriction fragment length polymorphisms demonstrate single origin of infection centers in Phellinus weirii

1994 ◽  
Vol 72 (4) ◽  
pp. 440-447 ◽  
Author(s):  
Hanhong Bae ◽  
Everett M. Hansen ◽  
Steven H. Strauss
Keyword(s):  
Mitochondrial Dna ◽  
Restriction Fragment ◽  
Ribosomal Dna ◽  
Fragment Length ◽  
Host Species ◽  
Root Rot ◽  
Biological Species ◽  
Douglas Fir ◽  
Dna Probes ◽  
Restriction Fragment Length

Restriction fragment length polymorphism (RFLP) markers were used to study genetic variation in the basidiomycete fungus Phellinus weirii (Murr.) Gilbertson, the cause of laminated root rot of conifers. In an initial study, three isolates each from the Douglas-fir type and the cedar-type biological species were surveyed with 12 restriction enzymes and 20 random, mitochondrial, and nuclear-ribosomal gene probes. The two biological species were distinct with most probe–enzyme combinations (91%). Variation within biological species was detected for the random and ribosomal DNA probes but not for the mitochondrial DNA probes. In a subsequent study 65 probe–enzyme combinations (13 × 5) that had detected variation within the Douglas-fir type biological species were used to analyze 27 isolates derived from six infection centers, two host species, and two geographic areas in western Oregon. Infection centers differed from one another in numerous probe–enzyme combinations but were nearly genetically uniform within. Isolates from the two host species, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and mountain hemlock (Tsuga mertensiana (Bong.) Carr.), showed few RFLP differences. Initiation of infection centers, and subsequent vegetative or basdiospore initiated immigration, appear to be rare events. Key words: ribosomal DNA, mitochondrial DNA, RFLP, root rot, conifer.

scholarly journals Gene Expression Profiling of a Compatible Interaction Between Douglas-Fir and the Root Rot Fungal Pathogen Phellinus sulphurascens

2013 ◽  
Vol 103 (6) ◽  
pp. 583-593 ◽  
Author(s):  
M. A. Islam ◽  
Rona N. Sturrock ◽  
Abul K. M. Ekramoddoullah
Keyword(s):  
Cdna Library ◽  
Root Rot ◽  
Douglas Fir ◽  
Coniferous Species ◽  
Elevated Expression ◽  
Plant Genes ◽  
Polymerase Chain ◽  
Fungal Genes ◽  
Root Tissues ◽  
Host Genes

Douglas-fir (DF) (Pseudotsuga menziesii) is one of the largest and most economically important coniferous species in western North America. Its productivity is greatly affected by the root rot fungus Phellinus sulphurascens Pilát. Evidence of resistance by DF to fungal root pathogens such as P. sulphurascens has been reported but mechanisms of resistance in this compatible pathosystem are not yet known. To better understand the DF–P. sulphurascens interaction, especially at the molecular level, we selected 12 diverse plant genes already identified as defense-related from a cDNA library constructed using root tissues from P. sulphurascens-infected DF seedlings. Using quantitative reverse-transcriptase polymerase chain reaction on infected DF root samples collected at five different time points after inoculation, we found that P. sulphurascens infection significantly elevated expression of the 12 selected genes. In most cases the highest expression level was recorded within 2 to 3 days after inoculation. The constructed cDNA library, which is enriched with defense-related host genes and a number of fungal genes, will continue to serve as a useful resource for future larger-scale gene discovery and functional research on the P. sulphurascens and DF pathosystem.

THE BEHAVIOUR OF FIVE WOOD SPECIES IN COMPRESSION

IAWA Journal ◽  
2002 ◽  
Vol 23 (2) ◽  
pp. 201-211 ◽  
Author(s):  
Simon Ellis ◽  
Paul Steiner
Keyword(s):  
Young’S Modulus ◽  
Populus Tremuloides ◽  
Wood Species ◽  
Young's Modulus ◽  
Douglas Fir ◽  
Thuja Plicata ◽  
Trembling Aspen ◽  
Moisture Contents ◽  
Red Cedar ◽  
Western Red Cedar

Five wood species, Oregon ash (Fraxinus latifolia Benth.), Balau (Shorea spp.), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), Western red cedar (Thuja plicata Donn ex D. Don), and Trembling aspen (Populus tremuloides Michx.) were loaded in compression longitudinally, radially and tangentially. The wood cubes were conditioned to one of four moisture contents prior to loading. Small cubes were loaded until no void space remained after which samples were released and soaked in water. Stress /strain curves were recorded over the whole range of strain and cube thicknesses were recorded at the end of the compression, after release from the testing apparatus, and after soaking in water. Denser woods resulted in a greater Young’s modulus, higher levels of stress and shorter time to densification than did less dense woods. Higher initial moisture contents apparently increased the plasticity of the wood leading to a lower Young’s modulus and lower levels of stress during compression, greater springback after release of stress and greater recovery after swelling in water. Differences observed in the radial and tangential behaviours were believed to be due to the supporting action of the rays when the wood was compressed in the radial direction in balau and trembling aspen and to the relative difference between the lower density earlywood and higher density latewood regions in ash, Douglas-fir and western red cedar.

Use of fungus (Phellinus weirii) which causes laminated root rot in Douglas fir trees to biodegrade toxic wastes

1988 ◽  
pp. 844-849
Author(s):  
KAYE RICHARDSON ◽  
GEORGE D WARD ◽  
NEELAM RAVEL ◽  
M L KUMLER ◽  
L M PIKE ◽  
...  
Keyword(s):  
Root Rot ◽  
Douglas Fir ◽  
Toxic Wastes ◽  
Phellinus Weirii

Susceptibility of Western Conifers to Laminated Root Rot (Phellinus weirii) in Oregon and British Columbia Field Tests

1993 ◽  
Vol 8 (2) ◽  
pp. 67-70 ◽  
Author(s):  
E. E. Nelson ◽  
Rona N. Sturrock
Keyword(s):  
British Columbia ◽  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Root Rot ◽  
Field Tests ◽  
Tsuga Heterophylla ◽  
Picea Sitchensis ◽  
Thuja Plicata ◽  
Giant Sequoia ◽  
Phellinus Weirii

Abstract Several species of conifers were outplanted around infected stumps in Oregon and British Columbia to measure their susceptibility to laminated root rot caused by Phellinus weirii. Grand fir (Abies grandis) experienced nearly 30% mortality caused by P. weirii. Douglas-fir (Pseudotsuga menziesii) mortality exceeded 20%. Noble fir (A. procera), Sitka spruce (Picea sitchensis), giant sequoia (Sequoiadendron giganteum), western hemlock (Tsuga heterophylla), and ponderosa pine (Pinus ponderosa) mortality averaged less than 10%. Western white pine (P. monticola) and lodgepole pine (P. contorta) mortality was less than 1%. Phellinus weirii did not cause mortality of western redcedar (Thuja plicata) or redwood (Sequoia sempervirens). Apparent susceptibility, based on mortality over 17-20 growing seasons, was similar to that recorded in past field observations. West. J. Appl. For. 8(2):67-70.

scholarly journals Forest nutrition studies in Douglas-fir on Vancouver Island: A second report

1972 ◽  
Vol 48 (2) ◽  
pp. 88-91 ◽  
Author(s):  
D. L. Handley ◽  
L. V. Pienaar
Keyword(s):  
Vancouver Island ◽  
Douglas Fir ◽  
Forest Nutrition

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