Tom Warkentin

Tom Warkentin
University of Saskatchewan | U of S · Department of Plant Sciences

PhD

About

286
Publications
92,545
Reads
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6,765
Citations
Additional affiliations
July 1999 - December 2015
University of Saskatchewan
Position
  • Professor
July 1999 - March 2016
University of Saskatchewan
Position
  • Professor
September 1992 - June 1999
Agriculture and Agri-Food Canada
Position
  • Researcher
Education
January 1988 - February 1992
University of Saskatchewan
Field of study
  • Crop Science
May 1984 - April 1986
University of Manitoba
Field of study
  • Plant Science
September 1979 - April 1983
University of Manitoba
Field of study
  • Agriculture

Publications

Publications (286)
Article
Full-text available
Background: Black pepper [Piper nigrum (L.), Family: Piperaceae] is used traditionally for the treatment of various diseases including; cough, cold, dyspnea throat diseases, intermittent fever, dysentery, stomachache, worms and piles. The pharmacological potential of black pepper is due to the presence of metabolites like phenolic compounds, alkalo...
Article
Full-text available
The essential oil of cardamom capsules is a high-value ingredient in foods, beverages, perfumery, and traditional medicines. It is responsible for the characteristic aroma of cardamom. The present study aimed to evaluate essential oil yield and chemical constituents of 22 diverse accessions of cardamom. A total of 20 g of the cured capsules were hy...
Article
Full-text available
The inclusion of pulses in traditional wheat-based food products is increasing as the food industry and consumers are recognizing the nutritional benefits due to the high protein, antioxidant activity, and good source of dietary fiber of pulses. Iron deficiency is a significant global health challenge, affecting approximately 30% of the world's pop...
Article
Field pea (Pisum sativum), a major pulse crop in western Canada, is sensitive to elevated temperature, and possibly to high night temperature. Our objective was to examine if increasing night temperature (exceeding night temperatures currently seen in the area of production - western Canadian prairies) while maintaining a constant daytime temperatu...
Article
Full-text available
Globally, two billion people suffer from micronutrient deficiencies. Cereal grains provide more than 50% of the daily requirement of calories in human diets, but they often fail to provide adequate essential minerals and vitamins. Cereal crop production in developing countries achieved remarkable yield gains through the efforts of the Green Revolut...
Article
Elevated temperatures associated with climate change result in crops being exposed to frequent spells of heat stress. Heat stress results in reduced yield in field pea (Pisum sativum L.); it is therefore important to identify cultivars with improved pod and seed retention under heat to mitigate this loss. Objectives were to investigate the effect o...
Article
Full-text available
The objective of this study was to evaluate the stage of maturity at harvest for pea hay (Pisum sativum L., c.v. CDC Horizon) on dry matter intake (DMI), eating behavior, ruminal fermentation, and digestibility when fed to beef heifers. Pea hay was cut at EARLY (defined to occur when flat pods were on one or more nodes), MID (when seeds filled the...
Article
The objective was to evaluate the effect of inclusion rate of pea hay in barley and oat hay when fed to beef cattle. Six ruminally-cannulated heifers (407 ± 38 kg) were used in a 6 × 6 Latin square with a 2 × 3 factorial design and 25-d periods. Treatments included barley or oat hay blended with pea hay to achieve inclusion rates of 0, 15, or 30% (...
Article
The objective of this experiment was to evaluate stage of maturity at harvest for pea hay on DMI, eating behavior, ruminal fermentation, and digestibility when fed to beef heifers. Pea hay was harvested at early, mid, and late stages of maturity. Early was defined as observing flat pods at one or more nodes. Mid stage was defined as seeds filling t...
Article
Full-text available
Whole genome profiling (WGP) is a sequence-based physical mapping technology and uses sequence tags generated by next generation sequencing for construction of bacterial artificial chromosome (BAC) contigs of complex genomes. The physical map provides a framework for assembly of genome sequence and information for localization of genes that are dif...
Data
Unique sequence tags identified by sequencing ends of restriction fragments of 295,680 BAC clones.
Data
Number of BAC clones in each contig built based on the sequence similarities of unique sequence tags.
Data
Distribution of BAC clones in contigs built based on the sequence similarities of unique sequence tags.
Data
Fingerprinted Contig output file to visualize all the BAC contigs and overlap of each BAC in the reported contigs.
Data
BAC clones corresponding to the unique sequence tags identified by sequencing ends of restriction fragments of 295,680 BAC clones.
Article
Full-text available
Main conclusion ATR-FTIR spectroscopy in combination with uni- and multivariate analysis was used to quantify the spectral–chemical composition of the leaf cuticle of pea, investigating the effects of variety and heat stress. Field pea (Pisum sativum L.) is sensitive to heat stress and our goal was to improve canopy cooling and flower retention by...
Article
Field pea (Pisum sativum), a major grain legume crop, is autogamous and adapted to temperate climates. The objectives of this study were to investigate effects of high temperature stress on stamen chemical composition, anther dehiscence, pollen viability, pollen interactions with pistil and ovules, and ovule growth and viability. Two cultivars (‘CD...
Article
Full-text available
Whole genome profiling (WGP) is a sequence-based physical mapping technology and uses sequence tags generated by next generation sequencing for construction of bacterial artificial chromosome (BAC) contigs of complex genomes. The physical map provides a framework for assembly of genome sequence and information for localization of genes that are dif...
Conference Paper
Full-text available
The inclusion of forage pea (Pisum sativum L.) in mixtures with forage barley (Hordeum vulgare L.) or oat (Avena sativa L.) for greenfeed or silage production is gaining interest in western Canada. A twelve-different combination of monocultures and mixtures were evaluated for forage dry matter (DM) yield and forage quality in three soil zones of Sa...
Article
Full-text available
Pulses are staple foods that are gaining recognition as sources of non-gluten proteins, slow digestible starch, and dietary fiber. Several factors contribute to the cooking quality of pulses including genetics, environment, and their interactions. In this study, four cultivars each of faba bean, lentil, and pea were evaluated for nutrient content,...
Article
Full-text available
Background: The objective of this research was to map quantitative trait loci (QTLs) of multiple traits of breeding importance in pea (Pisum sativum L.). Three recombinant inbred line (RIL) populations, PR-02 (Orb x CDC Striker), PR-07 (Carerra x CDC Striker) and PR-15 (1-2347-144 x CDC Meadow) were phenotyped for agronomic and seed quality traits...
Article
Prevailing global warming has challenged agricultural production such that it is paramount to evaluate crop cultivars that tolerate increasing temperatures. Heat tolerance in many crops has been screened by examining in vitro pollen germination. The objectives of this study were to determine the effects of high temperature on in vitro pollen germin...
Article
CDC Inca, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2015 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Inca has good lodging resistance, medium-sized round seeds, and good yielding ability...
Article
CDC Spectrum, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Spectrum has good lodging resistance, medium-sized round seeds, and good yielding...
Article
CDC Spruce, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Spruce has good lodging resistance, medium-sized round seeds, and good yielding abil...
Article
CDC Canary, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2017 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Canary has good lodging resistance, medium-sized round seeds, early maturity, and g...
Article
CDC Athabasca, a yellow cotyledon field pea (Pisum sativum L.) cultivar, was released in 2016 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Athabasca has good lodging resistance, large-sized round seeds, and good yieldin...
Article
CDC Forest, a green cotyledon field pea (Pisum sativum L.) cultivar, was released in 2017 by the Crop Development Centre, University of Saskatchewan for distribution to select seed growers through the Variety Release Committee of the Saskatchewan Pulse Growers. CDC Forest has good lodging resistance, medium-sized round seeds, and good yielding abil...
Article
Full-text available
Biological nitrogen fixation (BNF) can be improved by optimizing the interaction between the rhizobial inoculant and pea (Pisum sativum L.), leading to increased productivity and reduced nitrogen (N) fertilizer use. Eight Rhizobium leguminosarum bv. viciae strains were used to inoculate super-nodulating pea mutant Rondo-nod3(fix+), hyper-nodulating...
Article
Full-text available
Field pea (Pisum sativum) is an important pulse crop globally for human consumption and livestock feed. A panel of 92 diverse pea cultivars was evaluated across nine environments and genotyped using 1536 single nucleotide polymorphisms (SNPs) arranged in a GoldenGate array. Population structure analysis revealed three subpopulations roughly consist...
Article
Full-text available
Synchrotron techniques are powerful tools in material and environmental sciences. However, they are currently underutilized in plant research. The Canadian Light Source synchrotron on the University of Saskatchewan campus is the only such facility in Canada, open to academic, government, and industrial clients. This review introduces the potential...
Article
There is little information on soybean [Glycine max (L.) Merr.] grown in western Canada despite its expanding acreage in this region. This study quantified the yield and uptake of nitrogen (N) and phosphorus (P) in three short-season soybean varieties (in 2014) and their impact on following wheat and canola crops, as well as soil nutrient supplies...
Article
Full-text available
Optimized biological nitrogen fixation (BNF) in pea (Pisum sativum L.) could increase crop productivity and reduce nitrogen fertilizer use in Western Canada. We tested the BNF capabilities and growth of three pea nodulation mutants (Frisson P64 Sym29, Frisson P88 Sym28 and Rondo-nod3 (fix+)) compared to check cultivars (CDC Dakota, CDC Meadow, Fris...
Article
Full-text available
Ascochyta blight (AB) is an important disease of pea which can cause severe grain yield loss under wet conditions. In our previous study, we identified two quantitative trait loci (QTLs) abIII-1 and abI-IV-2 for AB resistance and these QTLs were consistent across locations and/or years in an inter-specific pea population (PR-19) developed from a cr...
Article
Full-text available
One hundred and seven recombinant inbred lines (RILs) were developed from the cross of field pea (Pisum sativum L.) cultivars CDC Centennial × CDC Sage with the objectives of evaluating phenology and yield components, and to map the quantitative trait loci (QTLs) responsible for these traits. Experiments were conducted in 2013 using normal seeding...
Article
Field pea (Pisum sativum L.) is a nutritious pulse crop consumed as food and animal feed in many countries. The present study was performed to determine the potential effects of Fe, phytate, and carotenoid concentrations on Fe bioavailability (FeBIO) of field pea seeds. Selected PR-07 (recombinant inbred line [RIL] population derived from the cross...
Article
Full-text available
High-throughput/low-cost/low-tech methods for phytic acid determination that are sufficiently accurate and reproducible would be of value in plant genetics, crop breeding and in the food and feed industries. Variants of two candidate methods, those described by Vaintraub and Lapteva (Anal Biochem 175:227–24, 1988; “VL” methods) and Huang and Lantzs...
Article
Full-text available
Key message: This work discusses several selected topics of plant genetics and breeding in relation to the 150th anniversary of the seminal work of Gregor Johann Mendel. In 2015, we celebrated the 150th anniversary of the presentation of the seminal work of Gregor Johann Mendel. While Darwin's theory of evolution was based on differential survival...
Article
The goal of this research was to investigate the physicochemical and functional properties of protein isolates obtained from several pea cultivars grown at two locations in Canada. The functionalities of the pea protein isolates (PPIs) were then compared with those of commercial food protein ingredients derived from milk, egg, pea, soy, and wheat....
Poster
Full-text available
Western Canada produces field pea (Pisum sativum L.) as a dryland crop, where it is exposed to heat stress when temperatures exceed 28°C. Several days of heat cause flower and pod abortion and most cultivars are heat sensitive. To seek traits for improved heat resistance we measured a 94 member pea collection. Pea cultivars originated from north Am...
Presentation
Full-text available
Elevated temperatures pose a threat to global crop production with current climate change. A better understanding of how heat stress impacts seed development will enable successful screening for heat-resistant cultivars to maintain agricultural food production. The objectives of this study were to screen for heat-resistant field pea (Pisum sativum)...
Article
Ascochyta blight of pea (Pisum sp.), caused by Peyronellaea pinodes, often results in serious yield losses. Some accessions of Pisum fulvum Sibth. & Sm. previously showed high levels of resistance and could be used as sources of new resistance genes. The objectives of this study were to develop a single nucleotide polymorphism (SNP)-based linkage m...
Article
The objective of this study was to determine the molecular structure and properties of recently released cultivars of field peas [CDC Golden (CDCG), Abarth (ABAR), CDC Patrick (CDCP) and CDC Amarillo (CDCA)] grown at different locations in Saskatchewan, Canada. Starch yield (on whole seed basis), apparent amylose, total lipid and specific surface a...
Article
The objective of this study was to produce a pea flour ingredient with higher slowly digestible (SDS) and resistant (RS) starch fractions for functional food applications. Heat-moisture treated flour (HMTF) in the presence of citric, gallic, or vanillic acids and esterified flour (EF) with citric acid were prepared and analyzed for structure and fu...
Conference Paper
While synchrotron techniques are powerful tools in material and environmental sciences, it is still underutilized in plant research. The Canadian Light Source synchrotron located on the campus of the University of Saskatchewan is the only such facility in Canada and is open to academic and government researchers, and industrial clients. This talk i...
Article
Full-text available
In the plant breeding cycle, the length of time from seed to seed is often a limiting factor in producing pure lines or recombinant inbred lines (RILs). The objective of this research was to accelerate the production of field pea RILs while maintaining the population size, through application of a technique referred to as ‘rapid generation technolo...
Article
Full-text available
In western Canada, chickpea (Cicer arietinum L.) production is challenged by short growing seasons and infestations with ascochyta blight. Research was conducted to determine the genetic basis of the association between flowering time and reaction to ascochyta blight in chickpea. Ninety-two chickpea recombinant inbred lines (RILs) developed from a...
Article
Artificial light in growth chambers typically has a higher red to far-red (R:FR) ratio compared with natural light. This higher ratio may delay flowering and reduce plant height in some long-day plants. Modification of light spectral quality to lower than the critical threshold of R:FR for a given plant species can have important implications with...
Article
Full-text available
Photoperiod is one of the major environmental factors determining time to flower initiation and first flower appearance in plants. In chickpea, photoperiod sensitivity, expressed as delayed to flower under short days as compared to long days, may change with the growth stage of the crop. Photoperiod sensitive and insensitive phases were identified...
Article
SNP arrays represent important genotyping tools for innovative strategies in both basic research and applied breeding. Pea is an important food, feed, and sustainable crop with a large (ca. 4.45 Gb) and not yet available genome sequence. In the present study, 12 pea recombinant inbred line populations were genotyped using the newly-developed GenoPe...
Article
Full-text available
Pea (Pisum sativum L.) is an annual cool-season legume and one of the oldest domesticated crops. Dry pea seeds contain 22-25% protein, complex starch and fiber constituents, and a rich array of vitamins, minerals, and phytochemicals which make them a valuable source for human consumption and livestock feed. Dry pea ranks third to common bean and ch...