A5047771991- Plant Gene Expression Analysis
- Phytochemicals and Antioxidant Activities
- Plant biochemistry and biosynthesis
- Berry genetics and cultivation research
- Horticultural and Viticultural Research
- Plant Physiology and Cultivation Studies
- Growth and nutrition in plants
- Powdery Mildew Fungal Diseases
- Plant Pathogenic Bacteria Studies
- Plant pathogens and resistance mechanisms
- Biochemical Analysis and Sensing Techniques
- Postharvest Quality and Shelf Life Management
- Plant Disease Management Techniques
- Light effects on plants
- Botanical Research and Applications
- Fungal Plant Pathogen Control
- Plant-Microbe Interactions and Immunity
- Plant and animal studies
- Composting and Vermicomposting Techniques
- Plant tissue culture and regeneration
- Tea Polyphenols and Effects
- Plant Molecular Biology Research
- Traditional Chinese Medicine Analysis
- Synthesis of Organic Compounds
- Natural product bioactivities and synthesis
TU Wien
2011-2024
University of Vienna
2005-2016
Institute of Chemical Engineering
2015
Technical University of Munich
2003-2004
Cannabis sativa L. has long been exploited for multiple purposes. Whereas all parts of the shoots are extensively used and well investigated, roots have always received less attention. The phytochemical spectrum differs significantly from rest plant, as no significant amounts cannabinoids found, whereas triterpenes phytosterols abundantly present. To shed light on unique phytochemistry hemp related industrial potential, three chemovars were investigated secondary metabolite composition...
During fruit ripening, strawberries show distinct changes in the flavonoid classes that accumulate, switching from formation of flavan 3-ols and flavonols unripe fruits to accumulation anthocyanins ripe fruits. In common garden strawberry (Fragaria×ananassa) this is accompanied by a switch pattern hydroxylation demonstrated almost exclusive pelargonidin based pigments. Fragaria vesca proportion showing one (pelargonidin) two (cyanidin) hydroxyl groups within B-ring equal. We isolated...
Overexpression of chalcone-3-hydroxylase provokes increased accumulation 3-hydroxyphloridzin in Malus . Decreased flavonoid concentrations but unchanged class composition were observed. The 3-hydroxyphlorizin contents correlate well with reduced susceptibility to fire blight and scab. involvement dihydrochalcones the apple defence mechanism against pathogens is discussed unknown biosynthetic steps their formation hamper studies on physiological relevance. 3-hydroxyphloretin one gaps pathway....
A recall campaign for commercial, orange flowering petunia varieties in spring 2017 caused economic losses worldwide. The were identified as undeclared genetically engineered (GE)-plants, harbouring a maize dihydroflavonol 4-reductase (DFR, A1), which was used former scientific transgenic breeding attempts to enable formation of pelargonidin derivatives from the precursor dihydrokaempferol (DHK) petunia. How and when A1 cDNA entered commercial process is unclear. We provide an in-depth...
3‐Deoxyanthocyanins provide bright orange‐red colours to flowers of some members the Gesneriaceae, including sinningia ( Sinningia cardinalis ). We examined 3‐deoxyanthocyanin biosynthesis in sinningia, particular, expression key flavonoid biosynthetic genes and activities encoded proteins. Two abundant 3‐deoxyanthocyanins, luteolinidin 5‐ O ‐glucoside apigeninidin ‐glucoside, three flavone glycosides, luteolin 7‐ ‐glucuronide apigenin ‐glucuronide, cinnamic acid verbascoside were identified...
Blue Angelonia × angustifolia flowers can show spontaneous mutations resulting in white/blue and white flower colourations. In such a line, loss of dihydroflavonol 4-reductase (DFR) activity was observed whereas chalcone synthase flavanone 3-hydroxylase remained unchanged. Thus, cloning characterization DFR carried out for the first time. Two full length cDNA clones, Ang.DFR1 Ang.DFR2, were obtained from diploid chimeral which demonstrated 99% identity their translated amino acid sequence....
Relative expressions of structural genes and a number transcription factors the anthocyanin pathway relevant in Vaccinium species, related key enzyme activities were compared with composition content metabolites skins ripe fruits wild albino blue bilberry (Vaccinium myrtillus) found Slovenia. Compared to common type, variant had 151-fold lower total 7-fold phenolic their berry skin, which correlated gene expression flavonoid 3-O-glycosyltransferase (FGT; 33-fold), flavanone 3-hydroxylase...
The formation of 4-deoxyaurones, which serve as UV nectar guides in Bidens ferulifolia (Jacq.) DC., was established by combination photography, mass spectrometry, and biochemical assays the key step aurone studied. yellow flowering ornamental plant accumulates deoxy type anthochlor pigments (6′-deoxychalcones corresponding 4-deoxyaurones) basal part flower surface whilst apex contains only carotenoids. For sensitive pollinating insects, this appears a bicoloured floral pattern can be...
A screening of plant quinones for inhibiting effects on the bacterial fire blight pathogen Erwinia amylovora was performed. The most active compound, juglone from walnuts, has a potent and specific bactericidal effect E. minimal inhibitory concentrations only 2.5–10 μM, with stronger at lower, but still physiological, pH values. In vitro tests inoculated flowers apple (Malus domestica) showed an efficacy 67% in preventing infection. two years field had variable degrees ranging 40 to 82%,...
The European Commission recently authorized the placing of haskap (Lonicera caerulea L.) berries as a novel food on EU market. It has been suggested that these have several health beneficial properties, due to their considerable content highly valuable secondary metabolites, such anthocyanins, phenolic acids, iridoids and fatty acids. Herein, we report dynamic streamlined extraction process for anthocyanins with supercritical carbon dioxide ethanol modifier. In particular, focused loganic...
Commercially available poinsettia (Euphorbia pulcherrima) varieties prevalently accumulate cyanidin derivatives and show intense red coloration. Orange-red bract color is less common. We investigated four cultivars displaying different hues with respect to selected enzymes genes of the anthocyanin pathway, putatively determining hue. Red correlated composition concentration showed common dark coloration in 'Christmas Beauty' Feeling' where were prevalent. In contrast, orange-red based on...
We investigated the bi-colored dahlia cultivar 'Seattle', which exhibits bright yellow petals with white tips, for its potential use as a model system studies of anthochlor biosynthesis. The base contained high amounts 6′-deoxychalcones and structurally related 4-deoxyaurones, well flavones. In contrast, only traces anthochlors flavones were detected in tips. No anthocyanins, flavonols, flavanones or dihydroflavonols found petals. Gene expression indicated that absence anthocyanins is caused...
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Summary Rose ( Rosa x hybrida ), a popular and widely spread garden plant, is infected by numerous plant diseases, which are mainly caused fungal even bacterial pathogens such as Erwinia amylovora , the causal agent of fire blight. Recently, prohexadione-Ca, 2-oxoglutarate specific inhibitor originally developed growth retardant, was reported to influence flavonoid composition apple pear leaves and, thus, increase resistance against blight other diseases. It supposed that this approach could...