A5079503785- Hydrology and Sediment Transport Processes
- Plant Water Relations and Carbon Dynamics
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Tree-ring climate responses
- Plant responses to water stress
- Plant Molecular Biology Research
- Bioenergy crop production and management
- Fire effects on ecosystems
- Genetic Mapping and Diversity in Plants and Animals
- Forest ecology and management
- Crop Yield and Soil Fertility
- Ecology and Vegetation Dynamics Studies
- Fish Ecology and Management Studies
- Plant Reproductive Biology
- Plant Stress Responses and Tolerance
- Genetics and Plant Breeding
- Tree Root and Stability Studies
- Plant Gene Expression Analysis
- Cryospheric studies and observations
- Forest Management and Policy
- Plant nutrient uptake and metabolism
- Seedling growth and survival studies
- Forest Ecology and Biodiversity Studies
- Leaf Properties and Growth Measurement
University of Lethbridge
2016-2025
Syngenta (United States)
2012
Oregon State University
2003-2012
Monsanto (United States)
2012
Michigan Technological University
2012
University of Calgary
1980-2007
University of Alberta
1992-2007
Alberta Environment and Protected Areas
2007
Western University
2007
University of Idaho
2003
Abstract We identified a dwarf transgenic hybrid poplar (Populus tremula × Populus alba) after screening of 627 independent activation-tagged lines in tissue culture, greenhouse, and field environments. The cause the phenotype was hyperactivated gene encoding GA 2-oxidase (GA2ox), major gibberellin (GA) catabolic enzyme plants. mutation resulted from insertion strong transcriptional enhancer near transcription start site. Overexpression GA2ox (PtaGA2ox1) caused hyperaccumulation mRNA...
Throughout the 20th century, Truckee River that flows from Lake Tahoe into Nevada desert was progressively dammed and dewatered, which led to collapse of its aquatic riparian ecosystems. The federal designation endemic cui-ui sucker (Chasmistes cujus) as endangered prompted a restoration program in 1980s aimed at increasing spring permit fish spawning. These did promote reproduction, well an unanticipated benefit, extensive seedling recruitment Fremont cottonwood (Populus fremontii) sandbar...
Vulnerability of xylem to loss hydraulic conductivity caused by drought-induced cavitation was determined for three riparian cottonwood species in Lethbridge, Alberta: Populus deltoides Bartr., P. balsamifera L., and angustifolia James. These suffered 50% one-year-old stem segments when pressure potential fell -0.7 MPa -1.7 angustifolia, making them the most vulnerable tree reported so far North America. The possible contribution dysfunction decline ecosystems dammed rivers is discussed.
Several native poplar species meet at the margins of their natural distributions in southern Alberta, Canada. In this semi-arid area, poplars are obligate riparian but they occupy several intergrading ecoregions. Populus deltoides Bartr. ex Marsh predominates warmest and driest eastern prairie ecoregions; P. balsamifera L. occupies cooler wetter western parkland montane angustifolia James hybrids between occur intermediate grassland We investigated stomatal characteristics these 51 genotypes...
Abstract River management based solely on physical science has proven to be unsustainable and unsuccessful, evidenced by the fact that problems this approach intended solve (e.g., flood hazards, water scarcity, channel instability) have not been solved long‐term deterioration in river environments reduced capacity of rivers continue meeting needs society. In response, there a paradigm shift over past few decades, towards restoration. But ecological, morphological, societal benefits...
Completed in 1951, the St. Mary Dam enables water storage and diversion for irrigation; river flows downstream are consequently dramatically reduced during summer months. To assess historical changes abundance of riparian cottonwoods (Populus balsamifera, Populus angustifolia, a few deltoides), airphoto analyses were conducted 40-km reaches upstream from dam along adjacent dammed undammed rivers. Cottonwoods lower River confined by steep-walled canyons to narrow bands lineal distance...
Several phytochrome-controlled processes have been examined in etiolated and light-grown seedlings of a normal genotype the elongated internode (ein/ein) mutant rapid-cycling Brassica rapa. Although ein displayed sensitivity to prolonged far-red light with respect inhibition hypocotyl elongation, expansion cotyledons, synthesis anthocyanin, they reduced red for all three these deetiolation responses. In contrast seedlings, did not show growth promotion response end-of-day irradiation....
The influence of river damming on the abundance riparian poplar forests was investigated by comparing forest abundances dammed St. Mary and Waterton rivers southern Alberta with neighbouring undammed Belly River. Forest distributions were determined estimating linear distance from airphotos taken in 1961 1981, both upstream downstream dams. During 20-year interval, a 48% reduction occurred Dam, which completed 1951. Downstream 1964, declined 23 %. Poplar along region River relatively...
Riparian poplar forests are declining downstream from many dams in the western prairie regions of North America. Drought-induced seedling and sapling mortality caused by abrupt drops water table level following river flow regulation may be contributing to this forest decline. Here we describe a device, rhizopod, for studying influence changing on survival growth. Seeds natural hybrid (Populus deltoides x P. balsamifera) were planted five rhizopods treated declines 0, 1, 2, 4, or 8 cm...