Ulrike Steiner
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View article: Imaging of Leaf Water Patterns of Vitis vinifera Genotypes Infected by Plasmopara viticola
Imaging of Leaf Water Patterns of Vitis vinifera Genotypes Infected by Plasmopara viticola Open
The water status of plants is affected by abiotic and biotic environmental factors and influences the growth and yield formation of crops. Assessment of the leaf water content (LWC) of grapevine using hyperspectral imaging (1000–2500 nm) w…
View article: Bioactivity of bryophyte extracts against Botrytis cinerea, Alternaria solani and Phytophthora infestans
Bioactivity of bryophyte extracts against Botrytis cinerea, Alternaria solani and Phytophthora infestans Open
Plant extracts can be used as crude extracts, alternative sources of known fungicides, new leads for fungicides and resistance inducers for an integrated pest management strategy. They are the point of interest in discovery of organic pest…
View article: Intra-Leaf Variability of Incubation Period Sheds New Light on the Lifestyle of Cercospora beticola in Sugar Beets
Intra-Leaf Variability of Incubation Period Sheds New Light on the Lifestyle of Cercospora beticola in Sugar Beets Open
The length of incubation period, i.e., the time between first contact of host and pathogen and the appearance of symptoms, varies among diseases and depends on environmental conditions. Cercospora beticola is the most important fungal path…
View article: The Hemibiotrophic Apple Scab Fungus Venturia inaequalis Induces a Biotrophic Interface but Lacks a Necrotrophic Stage
The Hemibiotrophic Apple Scab Fungus Venturia inaequalis Induces a Biotrophic Interface but Lacks a Necrotrophic Stage Open
Microscopic evidence demonstrated a strictly biotrophic lifestyle of the scab fungus Venturia inaequalis on growing apple leaves and characterised its hemibiotrophy as the combination of biotrophy and saprotrophy not described before. The …
View article: Hyperspectral imaging reveals small-scale water gradients in apple leaves due to minimal cuticle perforation by <i>Venturia inaequalis</i> conidiophores
Hyperspectral imaging reveals small-scale water gradients in apple leaves due to minimal cuticle perforation by <i>Venturia inaequalis</i> conidiophores Open
Effects of Venturia inaequalis on water relations of apple leaves were studied under controlled conditions without limitation of water supply to elucidate their impact on the non-haustorial biotrophy of this pathogen. Leaf water relations,…
View article: Isolation and characterization of the gene <i>HvFAR1</i> encoding <scp>acyl‐CoA</scp> reductase from the <i>cer‐za.227</i> mutant of barley (<i>Hordeum vulgare</i>) and analysis of the cuticular barrier functions
Isolation and characterization of the gene <i>HvFAR1</i> encoding <span>acyl‐CoA</span> reductase from the <i>cer‐za.227</i> mutant of barley (<i>Hordeum vulgare</i>) and analysis of the cuticular barrier functions Open
Summary The cuticle is a protective layer covering aerial plant organs. We studied the function of waxes for the establishment of the cuticular barrier in barley ( Hordeum vulgare ). The barley eceriferum mutants cer‐za.227 and cer‐ye.267 …
View article: A Melanin-Deficient Isolate of Venturia inaequalis Reveals Various Roles of Melanin in Pathogen Life Cycle and Fitness
A Melanin-Deficient Isolate of Venturia inaequalis Reveals Various Roles of Melanin in Pathogen Life Cycle and Fitness Open
Venturia inaequalis is the ascomycetous pathogen causing apple scabs and forms dark-pigmented spores and partially melanised infection structures. Although melanin is considered to be essential for the infection of host tissue, a spontaneo…
View article: Hyperspectral Imaging in the UV Range Allows for Differentiation of Sugar Beet Diseases Based on Changes in Secondary Plant Metabolites
Hyperspectral Imaging in the UV Range Allows for Differentiation of Sugar Beet Diseases Based on Changes in Secondary Plant Metabolites Open
Fungal infections trigger defense or signaling responses in plants, leading to various changes in plant metabolites. The changes in metabolites, for example chlorophyll or flavonoids, have long been detectable using time-consuming destruct…
View article: <i>Trichoderma</i> species isolated from grapevine with tolerance towards common copper fungicides used in viticulture for plant protection
<i>Trichoderma</i> species isolated from grapevine with tolerance towards common copper fungicides used in viticulture for plant protection Open
BACKGROUND Copper‐containing fungicides are applied broadly in organic viticulture against downy mildew caused by Plasmopara viticola . Although long‐term application of copper‐based fungicides is associated with ecotoxic effects on the en…
View article: Spectral signatures in the UV range can be combined with secondary plant metabolites by deep learning to characterize barley–powdery mildew interaction
Spectral signatures in the UV range can be combined with secondary plant metabolites by deep learning to characterize barley–powdery mildew interaction Open
In recent studies, the potential of hyperspectral sensors for the analysis of plant–pathogen interactions was expanded to the ultraviolet range (UV; 200–380 nm) to monitor stress processes in plants. A hyperspectral imaging set‐up was esta…
View article: Fungicidal Efficacy of Drying Plant Oils in Green Beans against Bean Rust (Uromyces appendiculatus)
Fungicidal Efficacy of Drying Plant Oils in Green Beans against Bean Rust (Uromyces appendiculatus) Open
As biorationals, plant oils offer numerous advantages such as being natural products, with low ecotoxicological side effects, and high biodegradability. In particular, drying glyceride plant oils, which are rich in unsaturated fatty acids,…
View article: Effect of moisture on symptom development and colonization of Fusarium species on maize leaves
Effect of moisture on symptom development and colonization of Fusarium species on maize leaves Open
Maize plants, fifteen-day old, were inoculated with three Fusarium species on the 4 th mature leaf and 6 th immature emerging leaf.The plants were grown under (1) 50-60% and (2) 80-90% relative humidity (RH).The symptoms of Fusarium were f…
View article: Sensory assessment of Cercospora beticola sporulation for phenotyping the partial disease resistance of sugar beet genotypes
Sensory assessment of Cercospora beticola sporulation for phenotyping the partial disease resistance of sugar beet genotypes Open
Background Due to its high damaging potential, Cercospora leaf spot (CLS) caused by Cercospora beticola is a continuous threat to sugar beet production worldwide. Breeding for disease resistance is hampered by the quantitative nature of re…
View article: Extending Hyperspectral Imaging for Plant Phenotyping to the UV-Range
Extending Hyperspectral Imaging for Plant Phenotyping to the UV-Range Open
Previous plant phenotyping studies have focused on the visible (VIS, 400–700 nm), near-infrared (NIR, 700–1000 nm) and short-wave infrared (SWIR, 1000–2500 nm) range. The ultraviolet range (UV, 200–380 nm) has not yet been used in plant ph…
View article: Discovering coherency of specific gene expression and optical reflectance properties of barley genotypes differing for resistance reactions against powdery mildew
Discovering coherency of specific gene expression and optical reflectance properties of barley genotypes differing for resistance reactions against powdery mildew Open
Hyperspectral imaging has proved its potential for evaluating complex plant-pathogen interactions. However, a closer link of the spectral signatures and genotypic characteristics remains elusive. Here, we show relation between gene express…
View article: Surface wax esters contribute to drought tolerance in Arabidopsis
Surface wax esters contribute to drought tolerance in Arabidopsis Open
Summary Waxes are components of the cuticle covering the aerial organs of plants. Accumulation of waxes has previously been associated with protection against water loss, therefore contributing to drought tolerance. However, not much infor…
View article: Ergot Alkaloids and their Hallucinogenic Potential in Morning Glories
Ergot Alkaloids and their Hallucinogenic Potential in Morning Glories Open
Naturally occurring and semisynthetic ergot alkaloids play a role in health care or as recreational drugs in Western and indigenous Mexican societies. Evidence is summarized that ergot alkaloids present in Central American Convolvulaceae l…
View article: Spectral Patterns Reveal Early Resistance Reactions of Barley Against<i>Blumeria graminis</i>f. sp.<i>hordei</i>
Spectral Patterns Reveal Early Resistance Reactions of Barley Against<i>Blumeria graminis</i>f. sp.<i>hordei</i> Open
Differences in early plant–pathogen interactions are mainly characterized by using destructive methods. Optical sensors are advanced techniques for phenotyping host–pathogen interactions on different scales and for detecting subtle plant r…
View article: Automated identification of sugar beet diseases using smartphones
Automated identification of sugar beet diseases using smartphones Open
Cercospora leaf spot ( CLS ) poses a high economic risk to sugar beet production due to its potential to greatly reduce yield and quality. For successful integrated management of CLS , rapid and accurate identification of the disease is es…
View article: Plant Phenotyping using Probabilistic Topic Models: Uncovering the Hyperspectral Language of Plants
Plant Phenotyping using Probabilistic Topic Models: Uncovering the Hyperspectral Language of Plants Open
Modern phenotyping and plant disease detection methods, based on optical sensors and information technology, provide promising approaches to plant research and precision farming. In particular, hyperspectral imaging have been found to reve…