Valentina Schmitzer

Valentina Schmitzer
University of Ljubljana · Department of Landscape Architecture

PhD

About

56
Publications
27,365
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2,687
Citations
Additional affiliations
October 2007 - August 2013
University of Ljubljana
Position
  • Researcher

Publications

Publications (56)
Article
Full-text available
This study investigated the composition of sugars, organic acids, individual and total phenolic compounds in the pulp, peel, leaves, and bark of a red-fleshed ‘Baya Marisa’ apple cultivar. As the fruit is known for its red pulp color, the study focused on comparing the profiles of primary and selected secondary metabolites in three sections along t...
Article
Full-text available
The aim of this research was to evaluate the effect of a combination of several mycorrhizal and bacterial biostimulants, applied before and after planting, on the ‘Clery’ strawberry’s performance. Vegetative and reproductive parameters (the number of crowns per plant, root/canopy weight and dimensions, the number of fruits per plant, individual fru...
Article
Full-text available
Landscape architecture students at the University of Ljubljana were encouraged to prepare temporal series of landscape and plant drawings to sharpen their sensitivity to changes in the perception of a land motive and vegetation morphology. Students chose a particular motive, defined the frame of the drawing, and identified characteristic plants on...
Article
Full-text available
The polyphagous brown marmorated stink bug (Halyomorpha halys Stål.) is an important pest in many countries. Recently it was noticed that it can feed on and cause damage to strawberries (Fragaria × ananassa Duch.). The metabolic response of strawberries to brown marmorated stink bug attacks was studied. Brown marmorated stink bugs attacked strawber...
Article
Full-text available
Roses have an indisputable leading role in private gardens. They also appear in public areas. They are very interesting plants for public urban areas because they represent aesthetic, ecological, tehnical and sociological potential. In public areas varietes are selected according to various criteria such as resistance to heat, low temperatures an d...
Article
Full-text available
Lamb's lettuce is a popular winter salad, often grown in private vegetable plots, small local farms or in intensive vegetable production. It is usually marketed as a ready-to-eat produce in supermarkets. The aim of the study was to evaluate the changes in biochemical composition and degradation of bioactive compounds during consumer-relevant time o...
Article
Full-text available
Nitrogen is an integral element of foliar sprays during apple fruit formation. However, in red cultivars, the application may have adverse effects on color in the second stage of fruit development. The effect of a low-dose foliar application of urea was monitored on ‘Topaz’ apple pomometric (fruit mass, firmness, total solids, starch content, skin...
Article
Full-text available
BACKGROUND Japanese dogwood (Cornus kousa Burg.) is a popular ornamental plant which develops edible compound fruit utilized in traditional Asian medicine. Previous compositional studies have focused on a small fraction of secondary metabolites at a single maturity stage. In order to address the question of optimal ripeness of Japanese dogwood frui...
Article
Environmentally-conscious organic strawberry fruit producers are mostly cultivating plants in non-heated greenhouses and striving to produce fruit early in season. Several strategies have been proposed to advance strawberry fruit formation, among them the use of seaweed extract in combination with silicon. The aim of the present research was to eva...
Article
In apple trees, natural fruitlet shedding is often insufficient to achieve optimal fruit size and yields. Natural fruitlet abscission can be stimulated by several technological measures and its knowledge is crucial for the implementation of adequate measures. The natural phenomenon of fruitlet shedding was monitored in apple trees in two consecutiv...
Article
Chemical composition and colorimetric parameters of alcoholic liqueurs prepared from rose petals were evaluated by comparing the potential of three cultivars (‘Amadeus’ ‘Colossal Meidiland’ and ‘Rosanna’) and three traditional methods of preparation (fresh/air-dried petals extracted in 50% ethanol or aqueous sucrose syrup). Extraction was performed...
Article
Detailed anthocyanin and flavonol profiles were investigated in three flower segments of four different hybrid primrose (Primula ×polyantha) cultivars, and individual compounds were identified using high-performance liquid chromatography (HPLC)/mass spectrometry system. Chlorophyll a and b and total carotenoids were evaluated spectrophotometrically...
Article
Differences in the content of sugars, organic acids, total phenolics and antioxidative activity have been evaluated among three different elderberry species (Sambucus nigra, Sambucus cerulea, Sambucus javanica) and seven interspecific hybrids. The highest content of sugars has been determined in the fruits of JA × CER hybrid and the lowest in fruit...
Article
The abscission process and the modifications in the levels of selected metabolites were monitored on ‘Golden Delicious’ apples in a two-year study. Individual sugars were analyzed using HPLC-RI and individual phenolics by UHPLC–PDA–MS. Fruitlets from lowest positions were most likely to shed. Moreover, fruits from the position nearest to the king f...
Article
Morphological parameters (size, weight, color), the content of sugars, organic acids, lycopene, β-carotene, and phenolics were determined in hips of Rosa canina (RCA), Rosa sweginzowii (RSW), Rosa rugosa (RUG), and selected ornamental Rosa cultivars Fru Dagmar Hastrup (FDH), Repandia (REP), Veilchenblau (RVB), Aloha (RAL), Bonica (BON), and Golden...
Article
Apple trees (Malus domestica Borkh.) develop an abundance of flowers and shed the majority of fruitlets in the first developmental stages. In this study the process of abscission was monitored in cultivar 'Golden Delicious' and linked with the position of fruitlets in the cluster, focusing on differences among central or king flower/fruit (K1), flo...
Article
Full-text available
Leafy cuttings of Prunus subhirtella Miq. 'Autumnalis' were harvested from mature, semi-mature and juvenile stock plants at four dates during the vegetative period 2011 (on 16th of May, on 30th of May, on 20th of June and on 11th of July) and their auxin levels (IAA, IAA-Asp) and sugar content (glucose, sucrose, sorbitol) were quantified. The IAA a...
Article
There are no defined maturity parameters for berry fruit which often results in harvesting and marketing of inedible, immature or over ripe berries. In the present study the changes in quality characteristics of different white-, red-, and black-currant cultivars as well as gooseberry and jostaberry fruit were investigated at three maturity stages....
Article
Leafy cuttings of Prunus subhirtella Miq. ‘Autumnalis’ were harvested from mature, semi-mature and juvenile stock plants at four dates during the vegetative period 2011 (on 16th of May, on 30th of May, on 20th of June and on 11th of July) and their auxin levels (IAA, IAA-Asp) and sugar content (glucose, sucrose, sorbitol) were quantified. The IAA a...
Article
Background As a part of the ongoing interest in nutritional and nutraceutical properties of locally produced fruits, the aim of the article was to determine sugars, organic acids, polyphenols and antioxidant capacity of wild bilberries grown in Slovenia. Primary and secondary metabolite composition of bilberry fruit was compared among six phyto-cli...
Article
Primary and secondary metabolites of Rosa canina hips were determined by HPLC/MS during ripening and after frost damage. Rose hips were harvested six times from the beginning of September until the beginning of December. Color parameters a*, b* and L* decreased during maturation. Glucose and fructose were the predominant sugars representing up to 9...
Article
A total of 19 different anthocyanins have been detected in four elderberry species and eight hybrids and quantified with the use of HPLC-MSn. The profile and content levels of anthocyanins varied considerably among the analyzed elderberry species and hybrids. Cyanidin-3-O-sambubioside and cyanidin-3-O-glucoside were the most abundant anthocyanins i...
Article
The effect and rate of anthracnose infection was evaluated on four French bean cultivars: 'Paulista' and 'Berggold' (tolerant), and 'Topcrop' and 'Re dei Burri' (susceptible). Artificial inoculation with Colletotrichum lindemuthianum was performed and the infection rate assessed on technologically mature bean pods. Healthy tissue, symptomatic spot,...
Article
Fruit diameter increase was monitored in four apple cultivars during three consecutive years (2006-2008) from t-stage until harvest. Individual fruit diameter increase was described using a negative exponential equation. Fruit growth curves of early ('Gala Brookfield'), mid-season ('Golden Delicious Reinders') and late ripening apple cultivars ('Br...
Article
Using high-performance liquid chromatography/mass spectrometry, leaf and petal phenolic profiles of four rose (Rosa) species (R. canina, R. glauca, R. rubiginosa, R. sempervirens) traditionally used for medicinal purposes and three modern rose cultivars (Rosarium Uetersen, Ulrich Brunner Fils, Schwanensee) were determined. An abundance of phenolic...
Article
The phenolic profile of healthy and infected raspberry canes was investigated in three raspberry cultivars: Autumn Bliss, Himbo Top and Polka. The content of total phenols and tannins was determined using spectrophotometric methods, whilst individual phenolic acids, flavan-3-ols, ellagic acid derivatives and glycosides of quercetin were analysed us...
Article
The aim of the study was to evaluate the effect of fast and slow freezing and frozen storage on metabolite content of six blackberry cultivars. The content of metabolites determined with HPLC RI/PDA-MS in stored blackberries was compared with the initial content of the fruit. During frozen storage of fruits a loss of vitamin C up to 80% has been re...
Article
Qualitative and quantitative changes of individual and total phenolics induced by Colletotrichum coccodes fungal infection have been studied in two susceptible sweet pepper cultivars ‘Soroksari’ and ‘Bagoly’, and the role of soluble phenolic compounds in plant's defence mechanism has been evaluated. Three distinct parts were analysed on pepper frui...
Article
Apple fruit diameter and final fruit mass were monitored from T-stage until harvest over three consecutive years to assess the accuracy of fruit diameter prediction at several timestamps during apple fruit development. Four apple cultivars were selected for the study: 'Golden Delicious Reinders', 'Gala Brookfield', 'Fuji Kiku 8' and 'Braeburn Hillw...
Article
Morphological changes and phenolic patterns of developing hellebore sepals and the effects of pistil removal on these parameters were studied by comparing six flower stages of Helleborus niger. Color changes were evaluated colorimetrically, chlorophyll content was measured spectrophotometrically, and anthocyanins and flavonols were identified and q...
Article
The effects of infection with Colletotrichum nymphaeae, the causative agent of strawberry black spot, were studied on two strawberry cultivars: susceptible 'Elsanta' and tolerant 'Honeoye' cultivar. Four treatments were established: 1. artificial inoculation; 2. spray application of pyraclostrobin + boscalid (Signum); 3. foliar spraying with calciu...
Article
The effect of Colletotrichum simmondsii infection on the contents of sugars, organic acids, and individual phenolic compounds was investigated in strawberry cultivar ‘Clery’. Primary metabolites were determined with the use of HPLC and secondary metabolites further confirmed with HPLC-MS. Colletotrichum simmondsii caused a decrease in sucrose and a...
Article
Physiological ageing of woody plants is a very important process in horticultural practice. Successful propagation depends strongly on juvenile stock plant material. Although the process of ageing has been studied in detail for many decades, there are lots of aspects still open. In this research the carbohydrate metabolism of leafy cuttings during...
Article
Sugars, organic acids, vitamin C, individual phenolic compounds and total phenolic content were determined in fruit of 23 black currant cultivars with a different degree of infection caused by black currant leaf spot (Drepanopeziza ribis) and septoria leaf spot (Septoria ribis) using HPLC analysis. Glucose and fructose were the most abundant sugars...
Article
The concentration of anthocyanins, chlorophyll a and b were quantified during bract development of three differently colored Euphorbia pulcherrima Willd. cultivars ('Mars White', 'Mars Pink', and 'Mira Red') and bract color was colorimetrically determined. Color parameter a* increased from the first analyzed stage of bract development to the subseq...
Article
The effect of foliar application of prohexadione-calcium (ProCa) on the expression of color and the content of secondary metabolites was observed in two rose cultivars: an orange-red cultivar 'KORcrisett' and a dark red cultivar 'KORikis'. The study aims to describe the induced accumulation of specific flavanones in rose by ProCa sprayings and the...
Article
Unlabelled: Sugars, organic acids, and total phenolic content in fruit of 25 wild and cultivated berry species were identified and quantified with high-performance liquid chromatograph. The composition of sugars, organic acids, and total phenolic compounds in various species of Vaccinium, Rubus, Ribes, and Fragaria genus was evaluated. Additonally...
Article
Apricot is one of the most popular Prunus species grown in the temperate zone and great variation in the contents of primary and secondary metabolites has been reported in its fruit. However, little is known on the phenolic profiles and antioxidant potential of important local cultivars. The objective of the study was to identify valuable parental...
Article
The potential effect of skin removal and roasting on individual and total phenolic content, and on antioxidative potential of 6 hazelnut cultivars were investigated. HPLC‐MS identification of individual phenolics confirmed the presence of 7 flavan‐3‐ols (catechin, epicatechin, 2 procyanidin dimers, and 3 procyanidin trimers), 3 flavonols (quercetin...
Article
In this study, we evaluated the changes in apple fruit quality during shelf life. After a month of cold storage, apples of cultivars “Jonagold” and “Golden Delicious” were exposed to ambient temperatures for 21 d, with subsequent sampling every 3 or 4 d. Fruit firmness, changes in amounts of sugars, malic acid, and phenolics were observed during sh...
Article
Color components, antioxidative potential, and total phenolic content were monitored in elderberry must and wine. Among individual phenolic compounds, quercetin and kaempferol compounds, phenolic acids, and anthocyanins were detected with high performance liquid chromatography coupled with mass spectrometry. Conventional enological parameters were...
Book
Phenolic compounds, especially anthocyanins, function as important secondary metabolites in rose flowers as they directly influence its visual attributes and thus the marketability of rose plants. Their content levels depend both on internal and external factors and among the latter substrate pH and application of sucrose has been reported to alter...
Article
Full-text available
The effect of substrate pH level (4.7, 3.3 and 7.3) on the anthocyanin, quercetin compounds, catechin and phenolic acids concentrations in petals of Rosa × hybrida L. 'KORcrisett' and on the number of flowers per plant was investigated. The phenolic profiles of this plant were established for the first time by the use of HPLC/MS. Plants potted in a...
Article
In the present study, the chemical and morphological status of eight cultivars of groundcover rose (Rosa xhybrida) with a range of flower colors was investigated. From the methanolic extracts of rose petals collected from flowers at four developmental stages, several phenolic compounds were identified via high-performance liquid chromatography/mass...
Article
The effect of substrate pH level (4.7, 3.3 and 7.3) on the anthocyanin, quercetin compounds, catechin and phenolic acids concentrations in petals of Rosa × hybrida L. 'KORcrisett' and on the number of flowers per plant was investigated. The phenolic profiles of this plant were established for the first time by the use of HPLC/MS. Plants potted in a...
Article
Primary metabolites (sugars, organic acids) and secondary metabolites (phenolics and carotenoids) were quantified by HPLC in fully ripe fruit of 11 kaki cultivars: 'Amankaki', 'Cal Fuyu', 'Fuji', 'Hana Fuyu', 'Jiro'. 'O'Cosho', 'Tenjin O'Gosho', 'Thiene', 'Tipo', 'Tone Wase' and 'Triumph'. Amongst the analysed cultivars, 'Tone Wase' stands out as t...
Article
The concentration of major anthocyanins, quercetins, catechin, and phenolic acids during flower development of Rosa xhybrida L. 'KORcrisett' was quantified using high-performance liquid chromatography/mass spectrometry. Additionally, the changes in petal color were monitored colorimetrically at four different stages of development (bud, partially o...
Article
Sugars and organic acids in the fruit of two cultivars and three selections of black elderberry (Sambucus nigra L.): ‘Haschberg’, ‘Rubini’, ‘Selection 13’, ‘Selection 14’ and ‘Selection 25’ were quantified. The anthocyanin as well as quercetin profiles of this plant material were also established by the use of HPLC/MS. Significant differences in th...
Article
The potential markers of juvenility (cyanidin 3-glucoside and cyanidin 3-rutinoside) in autumn leaves of seven Acer palmatum Thunb. cultivars were investigated. Three shoot positions were marked on each cultivar—crown shoot, middle shoot, and basal shoot—and the anthocyanins were analyzed using HPLC-MS. The results showed great differences in cyani...
Article
The correlation between the anthocyanin concentrations of seven Acer palmatum Thunb. cultivars and the chromaticity values a*, b*, a*/b* ratio, h degrees and L* was investigated. According to the position of leaves on the branch terminal, middle and base sample leaves were analyzed and the positional effect on the level of the major anthocyanin was...

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