A combined approach involving ampelographic description, berry oenological traits and molecular analysis to study native grapevine varieties of Greece

Merkouropoulos, Georgios; Michailidou, Sofia; Alifragkis, Antonios; Zioziou, Eleftheria; Koundouras, Stéfanos; Argiriou, Anagnostis; Nicolaou, N.

doi:10.5073/vitis.2015.54.special-issue.99-103

Cited by 2 publications

(2 citation statements)

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“…This high morphological diversity has also been reported in other collections (Lamine et al, 2014;Zinelabidine et al, 2014;Khalil et al, 2017;Abiri et al, 2020;Milisǐćet al, 2021). The variation explained by the first three axes of the PCA using ampelographic, ampelometric, and leaf disc test data was low and similar to that obtained by Merkouropoulos et al (2015) in an ampelographic study in a Greek grapevine collection. The projection of the first two axes on a plane allowed grouping the varieties included in the RPP2 and in the admixed population established in a previous work carried out with 21 microsatellite markers in the EVEGA Collection (Dıáz-Losada et al, 2012).…”

Section: Discussionsupporting

confidence: 84%

“…In the Russian ampelographic collection of "Novocherkassk", a study carried out with eight Georgian and three Dagestan varieties found differences in phenology, sugar content, and titratable acidity (Ganich and Naumova, 2020). Large diversity in soluble solids, anthocyanins, and phenolic content was noted in a study performed on 91 Greek accessions from the "AUTh's" ampelographic collection (Merkouropoulos et al, 2015). Khalil et al (2017) also observed high variation in both total soluble solids and titratable acidity traits in a Syrian grapevine collection.…”

Section: Discussionmentioning

confidence: 93%

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Screening of Galician grapevine varieties by SNPs, phenotypic traits, and phytopathology

Díaz-Fernández,

Loureiro,

Pereira-Lorenzo

et al. 2024

Front. Plant Sci.

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The genetic erosion of the European grapevine diversity in the last century has promoted the conservation of varieties in germplasm banks to prevent their disappearance. The study of these varieties is necessary as it would allow the diversification of the wine market, as well as provide a source of genes to face new pathogens or climate constraints. In this work, the grapevine varieties preserved in the “Estación de Viticultura e Enoloxía de Galicia” (EVEGA) Germplasm Bank (Ourense, Spain) were widely characterized, combining ampelography, ampelometry, agronomy, and phytopathology. Moreover, genetic characterization was carried out through the analysis of 48 single-nucleotide polymorphisms (SNPs). A Bayesian analysis based on the SNP data was carried out to define the genetic structure of the EVEGA Germplasm Bank, which allowed the differentiation of two main reconstructed panmictic populations (RPPs), confirming previous results obtained based on microsatellite markers (SSRs). A great diversity between varieties was found for almost every parameter evaluated for ampelography, ampelometry, phytopatology, phenology, and berry quality. A principal component analysis (PCA) performed with these phenotypical data allowed discrimination among some groups of varieties included in different genetic populations. This study allowed us to evaluate the grapevine diversity maintained in the EVEGA Germplasm Bank and characterize varieties of potential value for breeding programs of interest for the Galician viticulture.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 93%

Screening of Galician grapevine varieties by SNPs, phenotypic traits, and phytopathology

Díaz-Fernández,

Loureiro,

Pereira-Lorenzo

et al. 2024

Front. Plant Sci.

View full text Add to dashboard Cite

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Reducing SO<sub>2</sub> content in wine by combining High Pressure and glutathione addition

Christofi

Katsaros²,

Mallouchos

et al. 2021

OENO One

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The aim of this work was to examine the potential of High Pressure (HP) technology as an alternative technique to SO2 addition for red wine preservation. It focused on producing wines with reduced added SO2 and the simultaneous addition of glutathione (GSH) as a natural antioxidant. Selected quality parameters of red wine samples from Mouchtaro grapes treated by HP using various pressure parameters were tested. HP processing studied was applied at 200, 400 and 600 MPa for 0, 5 and 15 min. The application of HP for a long duration resulted in a significant reduction in phenolic compound concentrations (TP) due to both extended polymerisation and reduced volatile acidity (VA) and acetic acid concentrations (AAC), which in turn was mainly due to better antimicrobial protection. Based on the changes to the contents of all TP, VA and AAC groups, processing for 5 min at 400 MPa was selected as the optimum HP condition. Red wine samples from Mouchtaro grapes containing 0, 20, 40, 60, 80 and 100 mg/L of SO2 and 10 mg/L of GSH were HP-treated under the selected pressure/time conditions. Untreated samples containing the same concentrations of SO2 and GSH were used as control samples. Indices such as AAC, Antioxidant activity (AOA), total anthocyanins, TP, mean Degree of Tannin Polymerisation (mDP) and the composition of volatiles was determined over a period of 12 months. Sensory analysis of the samples took place during the 12th month of storage. After the 12-month period, the pressurised samples with GSH showed higher content of total aldehyde/ketone and higher-alcohols, consistently lower concentrations of acetic acid, ethyl acetate and total esters, and lower VA values. Finally, based on the results obtained from the sensory analysis, untreated samples were characterised by "Red fruits" odours, whereas treated samples were distinguished by their "chocolate" aroma. These results suggest that HP could be used for the production of more "mature" wines. A reduced SO2 concentration of up to 40 or 60 mg/L may be sufficient for wine stabilisation when combining HP treatment and GSH additions, depending on grape variety.

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A combined approach involving ampelographic description, berry oenological traits and molecular analysis to study native grapevine varieties of Greece

Cited by 2 publications

References 4 publications

Screening of Galician grapevine varieties by SNPs, phenotypic traits, and phytopathology

Screening of Galician grapevine varieties by SNPs, phenotypic traits, and phytopathology

Reducing SO<sub>2</sub> content in wine by combining High Pressure and glutathione addition

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