genotyping Articles
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Biplot analysis of rainfed barley multienvironment trials in Iran
The main objective of this work was the analysis of barley (Hordeum vulgare L.) multienvironment trials (MET) first to identify superior genotypes for the barley crop area in Iran, and second to investigate if different megaenvironments exist. The analyses were performed via GGE (genotype + genotype x environment) biplot methodology on the grain yield of 13 barley genotypes, selected from the ...
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Sources of soybean rust resistance challenged with single-spored isolates of phakopsora pachyrhizi
Soybean rust, caused by the fungus Phakopsora pachyrhizi Syd., is a potentially devastating disease that can cause significant yield losses. Resistance in soybean [Glycine max (L.) Merr.] germplasm, both qualitative and quantitative, may be effective in providing at least partial control of soybean rust. A number of soybean genotypes have resistance to soybean rust, but few of these have been ...
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Genotype x environment interaction and stability for isoflavone content in soybean
Isoflavones are naturally occurring compounds found in soybean [Glycine max (L.) Merr.]. Soybean isoflavone, as a quantitative trait, is subject to significant genotype x environment interaction, which makes breeding for this trait difficult. Thirty F4:7 soybean lines, derived from crosses of ‘RCAT Angora’ x CK-01 and ‘Heinong 35’ x RCAT Angora were classified within each population as high, ...
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Selecting Zinc-efficient wheat genotypes with high grain yield using a stress tolerance index
There is no reliable indicator for identifying Zn-deficiency tolerant genotypes with high grain yield. The aim of this investigation was to compare the grain yield response of 30 spring and 20 winter bread wheat (Triticum aestivum L.) genotypes to Zn fertilization under field condition and to select high grain yield Zn-deficiency tolerant genotypes using a stress tolerance indicator. The stress ...
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Generalizing the sites regression model to three-way interaction including multi-attributes
When a multienvironment trial (MET) is established across several locations and years, the interaction is referred to as a three-way array. Three-way interaction can be studied by means of three-way principal components analysis. In this study, the three-way principal components analysis is adapted to the sites regression model (three-way SREG). The three-way SREG with location and year combines ...
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Differential wilting among soybean genotypes in response to water deficit
Genotypic differences for canopy wilting have been reported for soybean [Glycine max (L.) Merr.], but no wilting data have been published, and mechanisms for differences remain unresolved. In field studies in 2002 and 2003, differences for wilting among 19 genotypes were consistent across years. Plant introductions (PI 416937 and PI 471938) were among the slowest wilting genotypes, and breeding ...
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Molecular characterization of giardia isolates from calves and humans in a region in which dairy farming has recently intensified
Giardiasis is a notifiable disease of high prevalence in New Zealand, but there is limited knowledge about the sources of Giardia duodenalis genotypes that can potentially cause human infections. Dairy calves are one environmental source of Giardia isolates, but it is unknown whether they harbor genotypes that are potentially capable of causing infections in humans. To address these questions, 40 ...
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Genotypic variation in peanut for transpiration response to vapor pressure deficit
Conservation of soil water resulting from decreases in stomata conductance under atmospheric high vapor pressure deficit (VPD) conditions is a possible approach for enhanced tolerance of water deficit by crops. Water deficit is usually a concern in peanut (Arachis hypogea L.) since it is frequently grown on sandy soils with low water-holding capacity. Seventeen peanut genotypes were studied to ...
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Study of genotype x environment interaction for chickpea yield in Iran
Plant breeders aim to select genotypes with stable phenotypes across environments. Multienvironment trials (METs) including 3 yr and six locations for 17 genotypes of chickpea (Cicer arietinum L.) were performed in Iran. Bartlett's test of homogeneity of variances was not significant and so the combined analysis was done. This analysis indicated that the environment (E), genotype (G), and the ...
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Analysis of Genotype X environment interactions for grain yield in durum wheat
Genotype x environment (GE) interactions are important sources of variation in crop breeding programs. The objectives of this study were (i) to analyze GE interactions on grain yield of one bread wheat (Triticum aestivum L.) and 19 durum wheat [T. turgidum L. subsp. durum (Desf.) Husn.] genotypes by the additive main effects and multiplicative interaction (AMMI) model, and (ii) to evaluate ...
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Genetic variability in nitrogen use efficiency of spring barley
Increasing costs of N fertilizers and the negative impact of excessive N on the environment have made improvement in nitrogen use efficiency (NUE) a desirable goal in barley (Hordeum vulgare L.) breeding. Seventeen replicated trials, each consisting of 15 to 20 genotypes, were performed across different environments in Alberta, Canada from 1998 to 2007 to determine genetic variability in NUE. ...
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RAPD markers reveal genetic diversity in Salix purpurea L.
The bark of purple osier willow (Salix purpurea L.) constitutes a particularly valuable raw material which is used for the production of natural aspirin. The content of salicylic glycosides in the bark is differential and depends on genotype, therefore continued selection is necessary to find high-yielding crop varieties of S. purpurea with a high salicylic glycoside content of the bark. The ...
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Molecular epidemiology of campylobacter jejuni populations in dairy cattle, wildlife, and the environment in a farmland area
We describe a cross-sectional study of the molecular epidemiology of Campylobacter jejuni in a dairy farmland environment, with the aim of elucidating the dynamics of horizontal transmission of C. jejuni genotypes among sources in the area. A collection of 327 C. jejuni isolates from cattle, wildlife, and environmental sources in a 100-km2 area of farmland in northwest England was characterized ...
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Response of heterozygous and homozygous Imidazolinone-resistant spring wheat genotypes to Imazamox
Imidazolinone-resistant (IR) spring wheat (Triticum aestivum L.) was released commercially in Canada in 2004, providing growers with a new opportunity to selectively control a broad range of weeds in wheat, including volunteer cereals and annual grasses. Imidazolinone (IMI) herbicides inhibit acetolactate synthase in susceptible (S) plants, but IR wheat plants have an altered target site that ...
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Combining ability for fiber length in near-long-staple upland cotton
Fiber length is one of the most important properties of cotton fibers, with longer fibers allowing for faster processing speeds and a wider array of end products. Four elite, near-long-staple upland cotton (Gossypium hirsutum L.) genotypes with diverse programmatic origins, TAM 94L-25, Fibermax 832, TTU 202, and Acala 1517-99, and one short-staple genotype, Tamcot CAMD-E, were crossed and ...
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Tocopherols Concentration and Stability in Early Maturing Soybean Genotypes
Soybean [Glycine max (L.) Merr.] is an important source of tocopherols which have health-beneficial properties. A study was conducted to determine tocopherols concentration and stability in early maturing soybean genotypes and to determine their relationships to other important seed characteristics. Twenty soybean genotypes were grown in replicated trials in six environments of eastern Canada, ...
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Linkage maps of wheat stripe rust resistance genes Yr5 and Yr15 for use in marker-assisted selection
Stripe rust (caused by Puccinia striiformis Westend. f. sp. tritici Eriks.) is a serious disease of wheat (Triticum aestivum L.). Resistance genes Yr5 and Yr15 are the only known all-stage resistance genes that defeat all stripe rust races currently found in the United States. Previously mapped markers for these genes, however, show limited polymorphism across diverse genotypes and/or map at a ...
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Morphology and Genetics of biomass in little bluestem
Little bluestem [Schizachyrium scoparium (Michx.) Nash] was the most important dominant species of uplands in the tallgrass prairie. Presently, it is a dominant species, most significantly on coarse-textured soils, in the mixed-grass prairie region of the United States and Canada. This wide geographical adaptation to dry soils suggests little bluestem has potential for biomass production in areas ...
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Naked oats for improving human nutrition: Genetic and agronomic variability of grain bioactive components
The impact of genotype, environment, and rotation on the variability of important bioactive compounds (protein and β-glucan) was evaluated in the grains of seven naked and two husked oat (Avena sativa L.) genotypes, grown in a set of trials in 2001–2002 and 2002–2003 in two Italian locations in winter seeding. Each trial was composed of two experiments, corresponding to different rotation ...
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Relationship between root characteristics of peanut in hydroponics and pot studies
A large root system can be an important character for drought tolerance. Measuring root characteristics in soil medium is tedious, time consuming, and labor intensive. The objective of this study was to determine the association between root characteristics of peanut (Arachis hypogaea L.) grown in hydroponics and in pot experiments. Twelve peanut genotypes were planted in a randomized complete ...
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