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Spangenberg JE, Zufferey V. Soil management affects carbon and nitrogen concentrations and stable isotope ratios in vine products. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 873:162410. [PMID: 36842594 DOI: 10.1016/j.scitotenv.2023.162410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/13/2023] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
Weeds reduce vineyard productivity and affect grape quality by competing with grapevines (Vitis vinifera L.) for water and nutrients. The increased banning of herbicides has prompted the evaluation of alternative soil management strategies. Cover cropping seems to be the best alternative for weed management. However, it may impact vine growth, grape yield, and quality. Quantitative studies on these changes are scarce. Our study aimed to investigate the combined effect of grass cover and water availability on vines of three cultivars, the white Chasselas and Petite Arvine and the red Pinot noir field-grown under identical climatic and pedological conditions and grafted onto the same rootstock. Soil management and irrigation experiments were performed during the 2020-2021 seasons. Two extreme soil management practices were established in the vineyard, based on 100 % bare soil (BS) by the application of herbicides with glufosinate or glyphosate as active ingredients and 100 % grass-covered soil (GS) by cover cropping with a mixture of plant species. Two water statuses were imposed by drip irrigation (DI) and no irrigation (NI). The level of vine-weed competition for water and nitrogen (N) was assessed in the vine, must, and wine solid residues (WSRs) by comparing measurements, i.e., the yeast assimilable N content, C/NWSR, carbon and N isotope ratios (δ13Cgrape-sugars, δ13CWSR, and δ15NWSR) among the different treatments (BS-DI, BS-NI, GS-DI, GS-NI). The increase in the δ13Cgrape-sugars and δ13CWSR values with increasing plant water deficit mimicked the observations in irrigation experiments on BS. The NWSR content and δ15NWSR values decreased with water stress and much more strongly in vines on GS. The dramatic N deficit in rainfed vines on GS could be alleviated with irrigation. The present study provides insights from chemical and stable isotope analyses into the potential impact of cover cropping in vineyards in the context of the banning of herbicides in a time of global water scarcity due to climate change.
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Affiliation(s)
- Jorge E Spangenberg
- Institute of Earth Surface Dynamics (IDYST), University of Lausanne, CH-1015 Lausanne, Switzerland.
| | - Vivian Zufferey
- Research Center of Viticulture, Agroscope, CH-1009 Pully, Switzerland
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2
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Tomada S, Agati G, Serni E, Michelini S, Lazazzara V, Pedri U, Sanoll C, Matteazzi A, Robatscher P, Haas F. Non-destructive fluorescence sensing for assessing microclimate, site and defoliation effects on flavonol dynamics and sugar prediction in Pinot blanc grapes. PLoS One 2022; 17:e0273166. [PMID: 35972948 PMCID: PMC9380915 DOI: 10.1371/journal.pone.0273166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 08/03/2022] [Indexed: 11/24/2022] Open
Abstract
In an era of growing international competition in modern viticulture, the study and implementation of innovative technologies to increase the production of high-quality grapes and wines are of critical importance. In this study, the non-destructive portable sensor Multiplex, based on fluorescence sensing technique, was applied to evaluate grape maturity parameters and flavonol content of the understudied Pinot blanc variety. The effects of environmental and agronomical factors on flavonol content of Pinot blanc grapes were investigated in eight vineyards characterised by different microclimatic and agronomic conditions. Furthermore, the direct impact of canopy management treatment on the flavonol dynamics of the grapes oriented in the four cardinal directions was assessed. Results highlight the positive role of moderate temperatures and direct sunlight exposure on Pinot blanc flavonol content; however, no direct vineyard-elevation effect was observed. The ability to modulate and evaluate the flavonol content in field represent crucial factors because of their potential effect on flavonoids-dependent wine characteristics, such as stability and ageing. In the present study, for the first time, two calibration curves were reported for pre- and post-veraison periods between flavonol indices and the berry skin flavonol content and a good correlation was observed between Multiplex measurement and the total polyphenolic content of grape juice. Moreover, the strong correlation between the chlorophyll index with grape juice sugar content and titratable acidity revealed the practical application of non-destructive sensors to predict the optimal harvest time for Pinot blanc grapes. In conclusion, the non-destructive fluorescence sensor Multiplex is a high-potential tool for innovative viticulture, for evaluating grape skin composition variables in white grape varieties.
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Affiliation(s)
- Selena Tomada
- Laimburg Research Centre, Laimburg, Italy
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
- * E-mail:
| | - Giovanni Agati
- Istituto di Fisica Applicata ‘Nello Carrara’, Consiglio Nazionale delle Ricerche (CNR), Sesto Fiorentino, Italy
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Strojnik L, Hladnik J, Weber NC, Koron D, Stopar M, Zlatić E, Kokalj D, Strojnik M, Ogrinc N. Construction of IsoVoc Database for the Authentication of Natural Flavours. Foods 2021; 10:foods10071550. [PMID: 34359420 PMCID: PMC8306145 DOI: 10.3390/foods10071550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 06/24/2021] [Accepted: 06/30/2021] [Indexed: 11/16/2022] Open
Abstract
Flavour is an important quality trait of food and beverages. As the demand for natural aromas increases and the cost of raw materials go up, so does the potential for economically motivated adulteration. In this study, gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) analysis of volatile fruit compounds, sampled using headspace-solid phase microextraction (HS-SPME), is used as a tool to differentiate between synthetic and naturally produced volatile aroma compounds (VOCs). The result is an extensive stable isotope database (IsoVoc—Isotope Volatile organic compounds) consisting of 39 authentic flavour compounds with well-defined origin: apple (148), strawberry (33), raspberry (12), pear (9), blueberry (7), and sour cherry (4) samples. Synthetically derived VOCs (48) were also characterised. Comparing isotope ratios of volatile compounds between distillates and fresh apples and strawberries proved the suitability of using fresh samples to create a database covering the natural variability in δ13C values and range of VOCs. In total, 25 aroma compounds were identified and used to test 33 flavoured commercial products to evaluate the usefulness of the IsoVoc database for fruit flavour authenticity studies. The results revealed the possible falsification for several fruit aroma compounds.
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Affiliation(s)
- Lidija Strojnik
- Department of Environmental Sciences, Jožef Stefan Institute, 1000 Ljubljana, Slovenia;
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia
| | - Jože Hladnik
- Agricultural Institute of Slovenia, 1000 Ljubljana, Slovenia; (J.H.); (N.C.W.); (D.K.); (M.S.)
| | - Nika Cvelbar Weber
- Agricultural Institute of Slovenia, 1000 Ljubljana, Slovenia; (J.H.); (N.C.W.); (D.K.); (M.S.)
| | - Darinka Koron
- Agricultural Institute of Slovenia, 1000 Ljubljana, Slovenia; (J.H.); (N.C.W.); (D.K.); (M.S.)
| | - Matej Stopar
- Agricultural Institute of Slovenia, 1000 Ljubljana, Slovenia; (J.H.); (N.C.W.); (D.K.); (M.S.)
| | - Emil Zlatić
- Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (E.Z.); (D.K.)
| | - Doris Kokalj
- Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia; (E.Z.); (D.K.)
| | | | - Nives Ogrinc
- Department of Environmental Sciences, Jožef Stefan Institute, 1000 Ljubljana, Slovenia;
- Jožef Stefan International Postgraduate School, 1000 Ljubljana, Slovenia
- Correspondence:
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4
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Moehring MJ, Harrington PDB. Analysis of Wine and Its Use in Tracing the Origin of Grape Cultivation. Crit Rev Anal Chem 2021; 52:1901-1912. [PMID: 34061694 DOI: 10.1080/10408347.2021.1925082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The concentrations of elemental and volatile components in wine and the effect of biological, meteorological, and anthropogenic factors on their levels are important for authentication and quality assurance. Sample preparation for atomic absorption and inductively coupled plasma spectrometries for elemental analysis as well as chromatographic and electronic nose (EN) analytical methods for volatile compounds are reviewed. The International Organization of Vine and Wine (OIV) and countries that produce and import wine developed methods and set limits on metal abundance to ensure that all metal concentrations are well below toxic threshold limits. With the use of data analysis tools, elemental analysis can enable wines to be traced back to their geographic region of origin. When paired with volatile and isotopic analysis the accuracy of this authentication greatly improves. Tracing studies are reviewed to demonstrate the capabilities of these analyses.
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Affiliation(s)
- Michael J Moehring
- Departmentof Chemistry & Biochemistry, Ohio University, Athens, Ohio, USA
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Wang Y, Liu T, Chen F, Wang X, Zhang F. Determination of exogenous prohibited flavour compounds added in coffee using gas chromatography triple quadrupole tandem massspectrometry and gas chromatography/combustion/isotope ratio mass spectrometry. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2020; 37:2011-2022. [PMID: 33151806 DOI: 10.1080/19440049.2020.1831081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
An analytical method based on gas chromatography coupled to triple quadrupole tandem mass spectrometry (GC-MS/MS) was developed for the simultaneous determination of exogenous prohibited flavour compounds in coffee samples. In addition, gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) was developed to determine the origin of the founded prohibited flavour compound, N-methylpyrrole-2-carboxaldehyde (NMPCA). The good selectivity and sensitivity achieved in multiple reactions monitoring (MRM) mode allowed satisfactory confirmation and quantitation for the flavour compounds. The limits of detection (LODs) and limits of quantitation (LOQs) of these compounds were in the range of 0.0005-5.0 µg/kg and 0.002-16.0 µg/kg, respectively. The coffee samples were extracted with simultaneous distillation extraction (SDE) and NMPCA was analysed on a GC/C/IRMS system. The δ13C values of endogenous NMPCA in coffee beans were within a range of -35.0‰ to -31.1‰, whereas exogenous NMPCA was the range from -27.9‰ to -23.9‰. The validation results revealed that the GC-MS/MS method was sensitive and reliable, and the origin of NMPCA can be distinguished by GC/C/IRMS. Finally, this method was successfully applied to coffee samples analysis and NMPCA was found in coffee samples.
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Affiliation(s)
- Yujiao Wang
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine , Beijing, China.,School of Bioengineering, Tianjin University of Science & Technology , Tianjin, China
| | - Tong Liu
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine , Beijing, China
| | - Fengming Chen
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine , Beijing, China
| | - Xiujuan Wang
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine , Beijing, China
| | - Feng Zhang
- Institute of Food Safety, Chinese Academy of Inspection & Quarantine , Beijing, China
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6
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Spangenberg JE, Schweizer M, Zufferey V. Shifts in carbon and nitrogen stable isotope composition and epicuticular lipids in leaves reflect early water-stress in vineyards. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:140343. [PMID: 32758968 DOI: 10.1016/j.scitotenv.2020.140343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/12/2020] [Accepted: 06/16/2020] [Indexed: 06/11/2023]
Abstract
Changes in leaf carbon and nitrogen isotope composition (δ13C and δ15N values) and the accumulation of epicuticular lipids have been associated with plant responses to water stress. We investigated their potential use as indicators of early plant water deficit in two grapevine (Vitis vinifera L.) cultivars, Chasselas and Pinot noir, that were field-grown under well-watered and water-deficient conditions. We tested the hypothesis that the bulk δ13C and δ15N values and the concentrations of epicuticular fatty acids may change in leaves of similar age with the soil water availability. For this purpose, leaves were sampled at the same position in the canopy at different times (phenological stages) during the 2014 growing season. Bulk dry matter of young leaves from flowering to veraison had higher δ13C values, higher total nitrogen content, and lower δ15N values than old leaves. In both cultivars, δ15N values were strongly correlated with plant water deficiency, demonstrating their integration of the plant water stress response. δ13C values recorded the water deficiency only in those plants that had not received foliar organic fertilization. The soil water deficiency triggered the accumulation of C>26 fatty acids in the cuticular waxes. The compound-specific isotope analysis (CSIA) of fatty acids from old leaves showed an increase in δ13C among the C16-C22 chains, including stress signaling linoleic and linolenic acids. Our results provide evidence for leaf 13C-enrichment, 15N-depletion, and enhanced FA-chain elongation and epicuticular accumulation in the grapevine response to water stress. The leaf δ13C and δ15N values, and the concentration of epicuticular fatty acids can be used as reliable and sensitive indicators of plant water deficit even when the level of water stress is low to moderate. They could also be used, particularly the more cost-efficient δ13C and δ15N measurements, for periodic biogeochemical mapping of the plant water availability at the vineyard and regional scale.
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Affiliation(s)
- Jorge E Spangenberg
- Institute of Earth Surface Dynamics (IDYST), University of Lausanne, CH-1015 Lausanne, Switzerland.
| | - Marc Schweizer
- Institute of Earth Surface Dynamics (IDYST), University of Lausanne, CH-1015 Lausanne, Switzerland
| | - Vivian Zufferey
- Institute of Plant Production Sciences (IPV), Agroscope, CH-1009 Pully, Switzerland
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7
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Marín-San Román S, Rubio-Bretón P, Pérez-Álvarez EP, Garde-Cerdán T. Advancement in analytical techniques for the extraction of grape and wine volatile compounds. Food Res Int 2020; 137:109712. [PMID: 33233285 DOI: 10.1016/j.foodres.2020.109712] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 09/10/2020] [Accepted: 09/14/2020] [Indexed: 12/13/2022]
Abstract
The grape and wine aroma is one of the most determining factors of quality, therefore the study of their volatile composition is a very important topic in vitiviniculture. The range of concentrations in which many of these compounds are found is quite low, in concentrations of ng/L; due to this, a sample preparation stage is necessary before doing the chromatographic analysis of the volatile compounds. In this review, the main analytical techniques used for the extraction of volatile compounds in grapes and wines are studied. The techniques presented are liquid-liquid extraction (LLE), solid phase extraction (SPE), solid phase microextraction (SPME), stir bar sorptive extraction (SBSE), and thin film solid phase microextraction (TF-SPME). For each of these techniques, a description was made, and the different characteristics were numbered, as well as their main advantages and disadvantages. Furthermore, from the second technique, a comparison is made with the previous techniques, explaining the reasons why new techniques have emerged. Throughout the review it is possible to see the different techniques that have been emerging in the past years as an improvement of the classical techniques.
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Affiliation(s)
- Sandra Marín-San Román
- Grupo VIENAP, Instituto de Ciencias de la Vid y del Vino (CSIC, Universidad de La Rioja, Gobierno de La Rioja), Ctra. de Burgos, Km. 6., 26007 Logroño, Spain
| | - Pilar Rubio-Bretón
- Grupo VIENAP, Instituto de Ciencias de la Vid y del Vino (CSIC, Universidad de La Rioja, Gobierno de La Rioja), Ctra. de Burgos, Km. 6., 26007 Logroño, Spain
| | - Eva P Pérez-Álvarez
- Grupo VIENAP, Instituto de Ciencias de la Vid y del Vino (CSIC, Universidad de La Rioja, Gobierno de La Rioja), Ctra. de Burgos, Km. 6., 26007 Logroño, Spain; Centro de Edafología y Biología Aplicada del Segura (CEBAS), Campus Universitario de Espinardo, Ed. 25, 30100 Murcia, Spain
| | - Teresa Garde-Cerdán
- Grupo VIENAP, Instituto de Ciencias de la Vid y del Vino (CSIC, Universidad de La Rioja, Gobierno de La Rioja), Ctra. de Burgos, Km. 6., 26007 Logroño, Spain.
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8
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Longo R, Carew A, Sawyer S, Kemp B, Kerslake F. A review on the aroma composition of Vitis vinifera L. Pinot noir wines: origins and influencing factors. Crit Rev Food Sci Nutr 2020; 61:1589-1604. [PMID: 32401040 DOI: 10.1080/10408398.2020.1762535] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Vitis vinifera L. Pinot noir still wines are some of the most popular and expensive red wines in the world. Several research articles are reported in literature concerning the impacts of viticultural and enological practices, and vineyard location, on Pinot noir still wine aroma. This review summarizes the previous and latest literature pertaining to volatile compounds including esters, higher alcohols and C13-norisoprenoids, and their effect on Pinot noir wine perceived aroma. Their origin and behavior are discussed, as well as their role in regional differentiation. The first part of this review paper presents an overview of volatile compounds that are usually found in Pinot noir still wines at concentrations higher than their odor detection threshold. The second part deals with studies pertaining to human inputs that impact on Pinot noir wine aroma profile such as viticulture and winemaking interventions. The role of the vineyard site is also revised. This review concludes by considering what further opportunities are available to researchers in this field for greater control over Pinot noir wine quality outcomes.
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Affiliation(s)
- Rocco Longo
- Horticulture Centre, Tasmanian Institute of Agriculture, University of Tasmania, Prospect, Tasmania, Australia
| | - Anna Carew
- Horticulture Centre, Tasmanian Institute of Agriculture, University of Tasmania, Prospect, Tasmania, Australia
| | - Samantha Sawyer
- Horticulture Centre, Tasmanian Institute of Agriculture, University of Tasmania, Prospect, Tasmania, Australia
| | - Belinda Kemp
- Cool Climate Oenology and Viticulture Institute (CCOVI), Brock University, St. Catharines, Ontario, Canada
| | - Fiona Kerslake
- Horticulture Centre, Tasmanian Institute of Agriculture, University of Tasmania, Prospect, Tasmania, Australia
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9
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Perini M, Strojnik L, Paolini M, Camin F. Gas Chromatography Combustion Isotope Ratio Mass Spectrometry for Improving the Detection of Authenticity of Grape Must. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:3322-3329. [PMID: 32011874 PMCID: PMC7997364 DOI: 10.1021/acs.jafc.9b05952] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 01/13/2020] [Accepted: 02/03/2020] [Indexed: 06/01/2023]
Abstract
Since ancient times, grape must and wine have been considered one of the most sophisticated matrices and, in the last few years, the continuous rise in volumes and prices of grapes and wine has encouraged fraud and adulteration in the oenological field. One of the most common adulterations is sugar addition to grape must in the form of cane or beet sugar or syrup coming from vegetable sources, such as cereals or fruits. Since 1990, the International Organisation of Vine and Wine (OIV) has issued specific official isotopic methods to fight against this practice, but they are not always effective. With the aim to develop a new method able to identify sugar addition, we compared the δ13C value of sugar extracted from grape must analyzed by elemental analyzer/isotope ratio mass spectrometry (EA-IRMS) to the δ13C value of proline analyzed by gas chromatography-combustion isotope ratio mass spectrometry (GC-C-IRMS), after extraction and derivatization. δ13C and δ15N of proline have also been tested as potential geographical markers. In addition, the carbon isotopic composition of two characteristic grape must sugars (myo- and scyllo-inositols) was measured by GC-C-IRMS, after derivatization, to identify the illegal correction of their concentration. On the basis of the obtained results we can conclude that the compound-specific isotope analysis represents a novel analytical tool to support and improve certification and control procedures.
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Affiliation(s)
- M. Perini
- Fondazione
Edmund Mach, Via Edmund Mach 1, 38010 San Michele all’Adige, Italy
| | - L. Strojnik
- Department
of Environmental Sciences, Jožef
Stefan Institute, 1000 Ljubljana, Slovenia
- Jožef
Stefan International Postgraduate School, 1000 Ljubljana, Slovenia
| | - M. Paolini
- Fondazione
Edmund Mach, Via Edmund Mach 1, 38010 San Michele all’Adige, Italy
| | - F. Camin
- Fondazione
Edmund Mach, Via Edmund Mach 1, 38010 San Michele all’Adige, Italy
- Center
Agriculture Food Environment (C3A), University
of Trento, 38010 San Michele all’Adige, Italy
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Spangenberg JE, Zufferey V. Carbon isotope compositions of whole wine, wine solid residue, and wine ethanol, determined by EA/IRMS and GC/C/IRMS, can record the vine water status—a comparative reappraisal. Anal Bioanal Chem 2019; 411:2031-2043. [DOI: 10.1007/s00216-019-01625-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 01/05/2019] [Accepted: 01/17/2019] [Indexed: 10/27/2022]
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11
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Spangenberg JE, Zufferey V. Changes in soil water availability in vineyards can be traced by the carbon and nitrogen isotope composition of dried wines. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 635:178-187. [PMID: 29660721 DOI: 10.1016/j.scitotenv.2018.04.078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/07/2018] [Accepted: 04/05/2018] [Indexed: 06/08/2023]
Abstract
The grapevine is one of the most important edible fruit plants cultivated worldwide, and it is highly sensitive to changes in the soil water content. We studied the total carbon and nitrogen contents and stable isotope compositions (C/NWSR, δ13CWSR and δ15NWSR values) of the solid residues obtained by freeze-drying wines produced from two white grapevine cultivars (Vitis vinifera L. cv Chasselas and Petite Arvine) field grown under different soil water regimes while maintaining other climatic and ecopedological conditions identical. These experiments simulated the more frequent and extended climate change-induced periods of soil water shortage. The wines were from the 2009-2014 vintages, produced using the same vinification procedure. The plant water status, reflecting soil water availability, was assessed by the predawn leaf water potential (Ψpd), monitored in the field during the growing seasons. For both wine varieties, the δ13CWSR values are highly correlated with Ψpd values and record the soil water availability set by soil water holding capacity, rainfall and irrigation water supply. These relationships were the same as those observed for the carbon isotope composition of fruit sugars (i.e., must sugars) and plant water status. In Chasselas wines, the nitrogen content and δ15NWSR values decreased with soil water deficit, indicating control of the flux of soil-water soluble nutrients into plants by soil water availability. Such a correlation was not found for Petite Arvine, probably due to different N-metabolism processes in this genetically atypical cultivar. The results presented in this study confirm and generalize what was previously found for red wine (Pinot noir); the carbon isotope composition of wine solid residues is a reliable indicator of the soil and the plant water status and thus can be used to trace back local climatic conditions in the vineyard's region. In most wines (except Petite Arvine) the C/NWSR and δ15NWSR values are indicators of the origin of the nitrogen supplied to the plant's fruit (grape) that can be used to assess the N dynamics in the soil-water-plant system.
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Affiliation(s)
- Jorge E Spangenberg
- Institute of Earth Surface Dynamics (IDYST), University of Lausanne, CH-1015 Lausanne, Switzerland.
| | - Vivian Zufferey
- Institute of Plant Production Sciences (IPV), Agroscope, CH-1009 Pully, Switzerland
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