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Sensory properties are an essential quality aspect when the consumption of fresh tomato is under consideration. The flavor of tomato is defined as a combination of taste sensations (sweetness, sourness), aroma (volatile compounds), and texture (firmness, mealiness), some of which are proven to be affected by insufficient nutrient supply ��� especially potassium (K). This study intends to undertake a holistic assessment of the K fertilization effect on the flavor of tomato by connecting the use of sensorial and instrumental methods. An optimal K supply significantly increased the sensory descriptors sweetness, sourness, and aroma as well as the instrumental estimated color, firmness, total soluble solids (TSS), titratable acids (TA), and dry matter (DM) in a cultivar-specific manner. The volatile organic compounds (VOCs) were not significantly affected by K fertilization. The evaluation by the panelists confirmed the results of the instru-mental analyses, by which an increment in the fruit quality with rising K supply could be detected. An optimal K supply of 3.66 g/plant could be suggested to increase tomato flavor in the cocktail cultivars studied: Primavera and Yellow Submarine. Cultivar effects should, therefore, be considered for defining the optimal K fertilizer dose that favors high tomato fruit quality and, hence, better flavor., Journal of Applied Botany and Food Quality, Vol. 94 (2021): Journal of Applied Botany and Food Quality

Journal für Kulturpflanzen, Bd. 69 Nr. 2 (2017): Themenheft Klimawandel

in strawberry. Despite numerous investigations of the metabolic composition of strawberries, the description of the relationship between flavor pattern and consumer acceptance is inconsistent. The aim of the present study was to correlate overall liking (acceptance), the intensity of important sensory parameters, which were evaluated by a consumer panel, and data of instrumental analyses like soluble solids content, titratable acidity and volatile organic compound patterning. The data were collected over a period of three harvest years. They are suitable to reveal the relationships and interactions between the metabolite patterns of strawberry and the sensory properties due to the use of a high diversity of the gene pool and due to a special sample preparation with representative sample sizes for both human sensory and instrumental analysis. A high genetic diversity was considered including genotypes from cultivar crossing and from wild species introgression. It was found that the volatile compounds methyl 2-methylbutanoate, (Z)-3-hexenyl acetate, linalool and decanoic acid correlate positively with the attribute ‘sweet’ and, therefore, can act as sweetness enhancers. Furthermore, compounds were identified with positive (linalool, lactones) and negative impact (some esters, furanones) on the sensory quality. From these findings, strategies towards improved, sensorially valuable strawberry cultivars with a high consumer acceptance can be deduced. The online version of this article (doi: 10.5073/JABFQ.2016.089.029) contains supplementary files., Journal of Applied Botany and Food Quality, Vol 89 (2016): Journal of Applied Botany and Food Quality

Three sample preparation methods for gas chromatographic analysis of white wine volatiles were tested. In order to find an adequate replacement for common liquidliquid extraction using 1,1,1-trichlorofluoromethan, headspace solid-phase microextraction (HS-SPME) and stir bar sorptive extraction (SBSE) were tested. SPME and SBSE sample preparations are characterized by rapid and easy handling, small sample size and the possibility of automation, but the recovery of aroma compounds is restricted because of the discrimination properties of the polymer phase. Unlike SPME, the results obtained by SBSE are more similar to those of liquid-liquid extraction., VITIS - Journal of Grapevine Research, Vol. 44 No. 4 (2005): Vitis

Falscher und Echter Mehltau sind weitverbreitete Krankheiten bei Weinpflanzen, die zu erheblichen Ernteverlusten führen können. Im Ökologischen Weinbau sind als Fungizide nur kupferhaltige Mittel zugelassen. Als mögliche Folgen der langjährigen Anwendung kupferhaltiger Pflanzenschutzmittel (PSM) werden der Verbleib im Boden und die Auswirkungen auf Bodenorganismen seit einigen Jahren national aber auch zunehmend international diskutiert. Darum ist es wichtig, alternative Pflanzenschutzstrategien zu entwickeln. Aus diesem Grund werden die Metabolitprofile der Blätter von resistenten Reben, wie amerikanischen Wildarten und alten Hybridsorten, mit den gegenüber Mehltau anfälligeren europäischen Sorten in mehreren Erntejahren verglichen. Das Metabolomic Profiling wird mit nicht-zielgerichteten Analysen durchgeführt, um so Hinweise auf noch unbekannte Resistenzbiomarker oder Elicitoren zu erhalten. Die Profile der flüchtigen Inhaltsstoffe (VOC), wurden mit Hilfe der Headspace-SPME-GC-MS analysiert. Bis jetzt konnten in den Weinblättern in einem einjährigen Versuch 81 der festgestellten 120 flüchtigen Komponenten identifiziert werden. Viele der detektierten Substanzen finden sich in mehreren der verschiedenen Rebarten bzw. -sorten. Es zeigen sich jedoch Unterschiede sowohl qualitativer als auch quantitativer Art. Mit Hilfe multivariater statistischer Datenverarbeitung (PCA) konnte gezeigt werden, dass der GC-Fingerprint mit den Entwicklungsstadien der Blätter sowie der Rebart bzw. -sorte eng korreliert, wohingegen der Unterschied zwischen Pflanzen derselben Sorte geringer ist., Journal für Kulturpflanzen, Vol. 65 No. 1 (2013)