A5088558714- Tree-ring climate responses
- Plant Molecular Biology Research
- Plant Water Relations and Carbon Dynamics
- Plant Gene Expression Analysis
- Plant biochemistry and biosynthesis
- Plant Reproductive Biology
- Fermentation and Sensory Analysis
- Horticultural and Viticultural Research
- Plant tissue culture and regeneration
- Forest ecology and management
- Forest Insect Ecology and Management
- Biochemical and biochemical processes
- Plant Diversity and Evolution
- Ecology and Vegetation Dynamics Studies
- Tree Root and Stability Studies
- Plant nutrient uptake and metabolism
- Plant Pathogens and Fungal Diseases
- Plant Physiology and Cultivation Studies
- Analytical Chemistry and Chromatography
- Forest Ecology and Biodiversity Studies
- Enzyme-mediated dye degradation
- Biofuel production and bioconversion
- Plant and Fungal Species Descriptions
- Polysaccharides and Plant Cell Walls
- Plant responses to water stress
University of New Brunswick
2004-2022
University of Fredericton
2022
Dalhousie University
2011
Queen's University
2011
Memorial University of Newfoundland
2011
The University of Melbourne
1999
Forestry Tasmania
1999
Commonwealth Scientific and Industrial Research Organisation
1999
Canadian Forest Service
1987
National Research Council Canada
1983
Featured paper: See also the Commentary by Ellis
A critique is provided of the physical and chemical control primary secondary xylem development in terms mechanics, genetics, phylogenetics, larger field plant physiology. Strengths weaknesses phytohormone theory vascular are analyzed. Homeobox genes, sub-cellular localization, anatomical responses to varied ratios dosages, polar auxin transport, second messengers, radial fluxes water potential, intercellular signalling, lignin biochemistry, phylogenetic position bryophytes relation...
Abstract Araucarioxylon Kraus is a widely known fossil‐genus generally applied to woods similar that of the extant Arau‐ cariaceae. However, since 1905, several researchers have pointed out this name an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood type: Agathoxylon Hartig, , Dadoxylon Endl. and Dammaroxylon J. Schultze‐Motel. This problem inconsistent application compounded by fact type represent wide range plants including basal...
Journal Article Auxin and ethylene regulation of diameter growth in trees Get access R. A. Savidge Department Forest ResourcesUniversiry New Brunswick, Fredericton, Canada E3B 6C2 Search for other works by this author on: Oxford Academic PubMed Google Scholar Tree Physiology, Volume 4, Issue December 1988, Pages 401–414, https://doi.org/10.1093/treephys/4.4.401 Published: 01 1988 history Received: 03 June
Seasonal cambial activity and xylem development were monitored anatomically at several main-stem positions in 20-year-old Pinuscontorta Dougl. Gas chromatography – mass spectrometry electron-capture gas-chromatography quantifications of endogenous indol-3-yl-acetic acid (IAA) (S)-abscisic (ABA), respectively, made these same tissues. In addition, IAA ABA measured shoot apices, growing needles, mature needles. Cambial reactivation occurred weeks before budbreak the base living crown, it only...
Endogenous E-coniferin was characterized chemically and found to accumulate in cambia of Picea glauca, Pinus banksiana, strobus, Larix laricina at the time resumption springtime cell-division activity well before initiation lignification differentiating tracheids. Coniferin content, quantified by high performance liquid chromatography, highest on centripetal side cambium, developing xylem, radial expansion cambial derivatives. Stem ringing resulted coniferin accumulation above ring...
At present, a carbon (C) content of 50% (w/w) in dry wood is widely accepted as generic value; however, few C measurements have been reported. We used elemental analysis to investigate per unit matter and observed that it varied both radially vertically boles two old-growth tree species: sugar maple (Acer saccharum Marsh.) giant sequoia (Sequoiadendron giganteum (Lindl.) Bucholz). In there was considerable variation ring widths among four radii for particular annual layers xylem, revealing...
Following cation and anion exchange chromatography, 1-aminocyclopropane-1-carboxylic acid (ACC) was converted to the 2,4-dinitrophenyl derivative then purified by high-performance liquid chromatography (HPLC). After three HPLC steps, endogenous ACC identified GCMS in vascular cambium on lower side of Pinus contorta Dougl. ssp. latifolia branches association with compressionwood differentiation, but not detected opposite wood cambial region upper sides same branches.The possibility that...
Endogenous indol-3yl acetic acid (IAA) was characterized by combined gas chromatography – mass spectroscopy (GC–MS) in inactive cambia of Pinus contorta Dougl. and Larix decidua Mill, during winter, IAA levels were estimated GC–MS buds, needles, the tissues comprising cambial region P. late autumn winter. Supplementary estimates obtained for Acer pseudoplatanus L., L. decidua, Populus × canadensis 'Robusta,' Quercus robur tissue lodgepole pine higher than those similar-aged hardwoods...
Although many studies have focused on factors influencing treeline advance with climate change, less consideration has been given to potential changes in tree spatial pattern across the forest–tundra ecotone. We investigated trends ecotone and geographical variation Yukon, Manitoba, Labrador, Canada. Tree cover was measured contiguous quadrats along transects up 100 m long located Forest, Ecotone, Tundra sections transition. Spatial patterns were analyzed using new local variance estimate...
Radial files of tracheids having changing orientations were traced through serial tangential sections to deduce events in fusiform cambial cells (FCCs) associated with spiral grain formation. Within an induction bridge phloem and cambium sloping diagonally across a stem girdle Pinus contorta Dougl. ssp. latifolia, repetitive, homologously sloping, pseudo-transverse anticlinal divisions FCCs primary event contributing FCC orientation changes. Imperfect periclinal (IPDs) also contributed. In...
Abstract The determination of phenols based upon coupling with 4-aminophenazone in the presence an alkaline oxidising agent has been examined. importance pH studied and a suitable buffering recommended. reactivity many pharmaceutical interest investigated application method to number preparations is described.
Protoplasts were isolated from developing xylem of Pinusbanksiana Lamb, and Pinusstrobus L. by incubating freshly harvested tissue in a cellulose–pectinase mixture having mannitol as osmoticum. then purified using discontinuous sucrose–mannitol gradient. More than 70% the protoplasts small diameter (12–27 μm) had dense cytoplasm many vacuoles, suggesting that they originated ray cells. Larger constituted about 25% protoplast population; these contained single large vacuoles only parietal...