Kirsten Kørup Sørensen

Aarhus University | AU · Department of Agroecology

The two-source energy balance model estimates canopy transpiration (Tr) and soil evaporation (E) traditionally from satellite partitions of remotely sensed land surface temperature (LST) and the Priestley-Taylor equation (TSEB-PT) at seasonal time with limited accuracy. The high spatial-temporal resolution spectral data collected by unmanned aerial...

Agricultural droughts cause a great reduction in winter wheat productivity; therefore, timely and precise irrigation recommendations are needed to alleviate the impact. This study aims to assess drought stress in winter wheat with the use of an unmanned aerial system (UAS) with multispectral and thermal sensors. High-resolution Water Deficit Index...

I 1990’erne blev der i det landsdækkende grundvandsovervågningsprogram (GRUMO) registreret en stigning i antallet af fund af pesticider i grundvandet. For at bidrage til at grundvandet ikke forurenes i forbindelse med landbrugets anvendelse af godkendte pesticider, blev ”VArslingssystemet for udvaskning af Pesticider til grundvandet” (VAP; www.vap-...

In 1998, the Danish Parliament initiated the Danish Pesticide Leaching Assessment Programme (PLAP), which is an intensive monitoring programme aimed at evaluating the leaching risk of pesticides under field conditions. The Danish Government funded the first phase of the programme from 1998 to 2001. The programme has now been prolonged several times...

Remote sensing can be used for precision management to assess plant nitrogen (N) and water (W) status in a spatially detailed and real-time manner. Recent advances in satellite-and drone technology calls for further study and refinement of methodological aspects for estimating plant N and W status. In our field experiment, we used multispectral dat...

Precision irrigation is a promising method to mitigate the impacts of drought stress on crop production with the optimal use of water resources. However, the reliable assessment of plant water status has not been adequately demonstrated, and unmanned aerial systems (UAS) offer great potential for spatiotemporal improvements. This study utilized UAS...

Remote sensing can be used for precision nutrient management to assess plant nitrogen (N) status in a spatially detailed and real-time manner. Despite recent advances in satellite-and drone technology and machine learning, neither differences between platforms nor methodological aspects for estimating plant N status have been sufficiently investiga...

Intercepted photosynthetically active radiation (Ipar, MJ m-2 d-1) is a key biophysical variable governing plant photosynthetic rate and net primary productivity (NPP, g m-2 d-1). Under optimal growth conditions, Ipar scales proportionally to NPP by a factor termed 'optimum radiation use efficiency' (RUE opt). The Carnegie-Ames-Stanford approach (C...

The detection of pesticides in groundwater over the past three to four decades has fueled the need for enhancing the scientific foundation for the existing approval procedure for pesticides and to improve the present risk assessment tools. A main issue in this respect is that the EU assessment, and hence also the Danish assessment, of the risk of p...

The research focus on detection of drought stress in winter wheat using the unmanned aerial vehicle (UAV) thermal imagery on a field scale. The experiment was performed in 30 m x 30 m plots on coarse sandy soil (Danish soil classification, JB 1) in central Jutland, Denmark. A total of 24 experimental plots with three different irrigation regimes we...

Aipar showed the same pattern for the three methods but with different spatial resolution Biomass growth showed significant correlation to Aipar. The relationship was influenced by year probably due to differences in weather.

Leaf area index (LAI; ratio between sum of foliar area and soil surface) is key variable to characterize plants canopies as it is related to light and energy capture. LAI estimated from UAV (MicaSense RedEdge Camera) and Sentinel-2 data had significant but weak relation with field measured LAI. Work goes on to improve LAI calculation and apply the...

Chilling temperatures (0–15°C) inhibit photosynthesis in most C4 grasses, yet photosynthesis is chilling tolerant in the ‘Illinois’ clone of the C4 grass Miscanthus x giganteus, a candidate cellulosic bioenergy crop. M. x giganteus is a hybrid between Miscanthus sacchariflorus and Miscanthus sinensis; therefore chilling‐tolerant parent lines might...

The original version of this article unfortunately contained a mistake. The Electronic Supplementary Materials (ESMs) were not captured in typesetting. The two perl scripts BAM2coverage.pl and CalculateSkewness.pl are now given in the ESM link provided below.

Indirect effects of high temperature through increased vapor pressure deficit (VPD) are vital but often ignored in climate impact studies. We investigated the direct (via heat) and indirect (via VPD) effects of a post-anthesis applied high temperature episode on biochemical and diffusional components of photosynthesis in two wheat cultivars. Plants...

Drought is a great challenge to agricultural production, and cultivation of drought-tolerant or water use-efficient cultivars is important to ensure high biomass yields for bio-refining and bioenergy. Here, we evaluated drought tolerance of four C3 species, Dactylis glomerata cvs. Sevenop and Amba, Festuca arundinacea cvs. Jordane and Kora, Phalari...

Climate change impacts rainfall patterns which may lead to drought stress in rain-fed agricultural systems. Crops with higher drought tolerance are required on marginal land with low precipitation or on soils with low water retention used for biomass production. It is essential to obtain plant breeding tools, which can identify genotypes with impro...

Background and aims: The C4 perennial grass miscanthus has been found to be less sensitive to cold than most other C4 species, but still emerges later in spring than C3 species. Genotypic differences in miscanthus were investigated to identify genotypes with a high cold tolerance at low temperatures and quick recovery upon rising temperatures to e...

Miscanthus, a perennial grass with C4 photosynthesis, is regarded as a promising energy crop due to its high biomass productivity. Compared with other C4 species, most miscanthus genotypes have high cold tolerances at 14 °C. However, in temperate climates, temperatures below 14 °C are common and our aim was to elucidate cold tolerances of different...

Potatoes and other Solanaceae species produce biologically active secondary metabolites called steroidal glycoalkaloids (GAs) which have antimicrobial, fungicidal, antiviral and insecticidal properties. GAs are, however, also toxic to animals and humans. Compared to wild species of potato, the elite cultivars primarily used for everyday consumption...

Miscanthus spp. have a broad geographic distribution with high levels of adaptation to different climates and edaphic conditions. This diversity can be a valuable resource for the development of miscanthus as an energy crop. Among crops with C4 photosynthesis, miscanthus is one of the most cold tolerant. Still, in cool temperate climates miscanthus...

Key message: WUE phenotyping and subsequent QTL analysis revealed cytosolic GS genes importance for limiting N loss due to photorespiration under well-watered and well-fertilized conditions. Potato (Solanum tuberosum L.) closes its stomata at relatively low soil water deficits frequently encountered in normal field conditions resulting in unnecess...

A clone of the hybrid perennial C4 grass Miscanthus × giganteus (Mxg) is known for achieving exceptionally high rates of leaf CO2 uptake during chilling. This is a requisite of success in the early spring, as is the ability of the leaves to survive occasional frosts. The aim of this study was to search for genotypes with greater potential than Mxg...

A drought screening experiment focusing on intrinsic water use efficiency (WUEi) was carried out among 132 clones belonging to a dihaploid potato mapping population. The clones were exposed to progressive soil drying during a five-day period in a greenhouse pot experiment. Analysis of the underlying variables was done based on a multivariate data a...

Green open access link: http://rdcu.be/zdef. Potatoes (Solanum tuberosum L.) are drought‐sensitive and more efficient water use, while maintaining high yields is required. Here, water‐use efficiency (WUE) of a mapping population comprising 144 clones from a cross between 90‐HAF‐01 (Solanum tuberosum 1 ) and 90‐HAG‐15 (S. tuberosum 2 × S. sparsipilu...

In spite of the agricultural importance of potato (Solanum tuberosum L.), most plant physiology studies have not accounted for the effect of the interaction between elevated carbon dioxide concentration ([CO2]) and other consequences of climate change on WUE. In 2010, a first controlled environment chamber experiment (E1) was performed with two tre...

Boar taint is the undesirable smell and taste of pork meat derived from some entire male pigs. The main causes of boar taint are the two compounds androstenone and skatole (3-methyl-indole). The steroid androstenone is a sex pheromone produced in the testis of the boars. Skatole is produced from tryptophan by bacteria in the intestine of the pigs....

All quantitative trait loci, including SNPs selected for the haplotype analysis, identified using QTDT and PLINK. The file contains information about breed, trait, SNPs, Sus scrofa chromosome and position.

Ventro-cranial chronic pleuritis can be a result of pleuropneumonia and enzootic pneumonia. These diseases cause severe losses in intensive pig production worldwide, but host resistance is difficult to breed for. It could be beneficial to use marker-assisted selection, and a step towards this is to identify genomic regions associated with the trait...

Pleuropneumonia is a major problem in pig production. At the time of slaughter, chronic pleuritis (CP) developed from pleuropneumonia is a common finding, and breeding for a reduced incidence of CP using marker-assisted selection (MAS) would be advantageous. Before applying MAS, quantitative trait loci (QTL) or markers associated with the prevalenc...

Genetic linkage maps are necessary for mapping of mendelian traits and quantitative trait loci (QTLs). To identify the actual genes, which control these traits, a map based on gene-associated single nucleotide polymorphism (SNP) markers is highly valuable. In this study, the SNPs were genotyped in a large family material comprising more than 5,000...

Gene location. Genes linked to the microsatellites on the IMpRH7000, mapped previously by linkage and physically either by RH panels, somatic-cell hybrids or by Blast analysis of the reference sequence against the pig BAC assembly. The genes are listed in chromosomal (SSC) order. Rearrangements according to the microsatellite map or BAC assembly po...

Data about the SNPs. The data file contains the following information on each SNP used in the study: SSC number, SNP ID, SNP assays, gene name, sex-averaged distance, female distance, male distance, number of meioses, sow minor allele frequency, number of heterozygous sires, forward and reverse primer sequences, human cytogenetic position, human ac...

New potato (Solanum tuberosum) varieties are required to contain low levels of the toxic glycoalkaloids and a potential approach to obtain this is through marker-assisted selection (MAS). Before applying MAS it is necessary to map quantitative trait loci (QTLs) for glycoalkaloid content in potato tubers and identify markers that link tightly to thi...

The jasmonic acid (JA) pathway is involved in the defense mechanisms induced in plants on pathogen attack and the enzyme 12-oxophytodienoate reductase (OPR3) catalyses one of the final steps of JA synthesis. A CAPS marker, OprDM, has been developed using primers designed from the tomato (Solanum lycopersicum)OPR3 cDNA sequence. Sequencing verified...

The global cultivation of potato (Solanum tuberosum) is threatened by epidemics caused by new variants of the late blight pathogen, Phytophthora infestans. New sources of durable late blight resistance are urgently needed and these may be found in wild Solanum species. The diploid wild species, S. vernei, has not previously been subjected to mappin...