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This work pursues the potential of extending “Industry 4.0” practices to farming toward achieving “Agriculture 4.0”. Our interest is in fruit harvesting, motivated by the problem of addressing the shortage of seasonal labor. In particular, here we present an integrated system architecture of an Autonomous Robot for Grape harvesting (ARG). The overall system consists of three interdependent units: (1) an aerial unit, (2) a remote-control unit and (3) the ARG ground unit. Special attention is paid to the ARG; the latter is designed and built to carry out three viticultural operations, namely harvest, green harvest and defoliation. We present an overview of the multi-purpose overall system, the specific design of each unit of the system and the integration of all subsystems. In addition, the fully sensory-based sensing system architecture and the underlying vision system are analyzed. Due to its modular design, the proposed system can be extended to a variety of different crops and/or orchards.
Eleni Vrochidou; Konstantinos Tziridis; Alexandros Nikolaou; Theofanis Kalampokas; George Papakostas; Theodore Pachidis; Spyridon Mamalis; Stefanos Koundouras; Vassilis Kaburlasos. An Autonomous Grape-Harvester Robot: Integrated System Architecture. Electronics 2021, 10, 1056 .
AMA StyleEleni Vrochidou, Konstantinos Tziridis, Alexandros Nikolaou, Theofanis Kalampokas, George Papakostas, Theodore Pachidis, Spyridon Mamalis, Stefanos Koundouras, Vassilis Kaburlasos. An Autonomous Grape-Harvester Robot: Integrated System Architecture. Electronics. 2021; 10 (9):1056.
Chicago/Turabian StyleEleni Vrochidou; Konstantinos Tziridis; Alexandros Nikolaou; Theofanis Kalampokas; George Papakostas; Theodore Pachidis; Spyridon Mamalis; Stefanos Koundouras; Vassilis Kaburlasos. 2021. "An Autonomous Grape-Harvester Robot: Integrated System Architecture." Electronics 10, no. 9: 1056.
Under the current and future climate crisis, a significant rise in soil salinity will likely affect vine productivity in several Mediterranean regions. During the present research, the rootstock effects on salinity tolerance of Merlot and Cabernet Franc grapevine cultivars were studied. In a pot hydroponic culture, own-rooted Merlot and Cabernet Franc grapevine cultivars or grafted onto the rootstocks 1103 P and 101-14 Mgt were drip-irrigated with saline water. A completely randomized 3 × 2 × 2 factorial experiment was designed with two vine rootstocks or own-rooted vines, two scion cultivars, and 100 mM NaCl salinity or control treatments, with six replications. A significant effect of scion cultivar, rootstock, and salinity was observed for most of the measured parameters. At the end of salinity stress period, leaf, shoot, root, and trunk nutrient concentrations were measured. Salinity stress increased Chloride (Cl) and Sodium (Na) concentrations in all parts of the vines and decreased leaf concentrations of Potassium (K), Calcium (Ca), Magnesium (Mg), Nitrogen (N), and Iron (Fe). In contrast, salinity stress increased leaf Boron (B) concentrations, whereas that of Manganese (Mn) remained unaffected. Leaf chlorophyll concentration decreased from 42% to 40% after thirty and sixty days of salt treatment, respectively. A similar trend was observed for the CCM-200 relative chlorophyll content. Salinity significantly decreased steam water potential (Ws), net CO2 assimilation rate (A), and stomatal conductance (gs) in all cases of grafted or own-rooted vines. Sixty days after the beginning of salt treatment, total Phenolics and PSII maximum quantum yield (Fv/Fm) decreased significantly. The rootstock 1103 P seems to be a better excluder for Na and Cl and more tolerant to salinity compared to 101-14 Mgt rootstock.
Kleopatra-Eleni Nikolaou; Theocharis Chatzistathis; Serafeim Theocharis; Anagnostis Argiriou; Stefanos Koundouras; Elefteria Zioziou. Effects of Salinity and Rootstock on Nutrient Element Concentrations and Physiology in Own-Rooted or Grafted to 1103 P and 101-14 Mgt Rootstocks of Merlot and Cabernet Franc Grapevine Cultivars under Climate Change. Sustainability 2021, 13, 2477 .
AMA StyleKleopatra-Eleni Nikolaou, Theocharis Chatzistathis, Serafeim Theocharis, Anagnostis Argiriou, Stefanos Koundouras, Elefteria Zioziou. Effects of Salinity and Rootstock on Nutrient Element Concentrations and Physiology in Own-Rooted or Grafted to 1103 P and 101-14 Mgt Rootstocks of Merlot and Cabernet Franc Grapevine Cultivars under Climate Change. Sustainability. 2021; 13 (5):2477.
Chicago/Turabian StyleKleopatra-Eleni Nikolaou; Theocharis Chatzistathis; Serafeim Theocharis; Anagnostis Argiriou; Stefanos Koundouras; Elefteria Zioziou. 2021. "Effects of Salinity and Rootstock on Nutrient Element Concentrations and Physiology in Own-Rooted or Grafted to 1103 P and 101-14 Mgt Rootstocks of Merlot and Cabernet Franc Grapevine Cultivars under Climate Change." Sustainability 13, no. 5: 2477.
The aim of this study was to estimate the genetic diversity of Greek and Bulgarian grapevine varieties with the use of microsatellite markers. The studied samples were collected from various productive vineyards, consisting of eight Greek and nine Bulgarian native varieties. In order to create a genetic profile for each sample, a multiplex PCR reaction method was used amplifying simultaneously seven microsatellite loci. Statistical analysis of data showed that there was a high degree of genetic heterogeneity among most of the varieties studied, highlighting the discriminative power of the chosen set of markers. Moreover, the synonymy of (I) Greek Pamid and Bulgarian Pamid and (II) Greek Zoumiatiko and Bulgarian Dimyat was suggested, as each variety pair had identical allele profiles in all loci examined. Regarding the Greek Mavrud and Bulgarian Mavrud varieties, there was a close genetic relationship between them, however, they did not share common alleles in all microsatellite loci and, therefore, should not be characterized as synonyms. On the other hand, Greek and Bulgarian Keratsouda, which were supposed to be common varieties, were found to be genetically different, supporting that these two varieties should be considered as homonyms. Despite the genotypic assay performed herein, we believe that additional molecular work is needed for the efficient management of Greek and Bulgarian grapevine genepools, as well as to safely suggest any synonym or homonym annotation.
Maria Papapetrou; Dimitrios Loukovitis; Orestis Papadopoulos; Zoi Kazlari; Anastasia Peristeraki; Slavina Arsenova; Desislava Bardarova; Desislava Doncheva; Serafeim Theocharis; Constantinos Karagiannidis; Stefanos Koundouras; Anastasia Giannakoula; Stamatis Aggelopoulos; Dimitrios Chatziplis. Genetic Diversity of Local Greek and Bulgarian Grapevine (Vitis Vinifera L.) Varieties. Diversity 2020, 12, 273 .
AMA StyleMaria Papapetrou, Dimitrios Loukovitis, Orestis Papadopoulos, Zoi Kazlari, Anastasia Peristeraki, Slavina Arsenova, Desislava Bardarova, Desislava Doncheva, Serafeim Theocharis, Constantinos Karagiannidis, Stefanos Koundouras, Anastasia Giannakoula, Stamatis Aggelopoulos, Dimitrios Chatziplis. Genetic Diversity of Local Greek and Bulgarian Grapevine (Vitis Vinifera L.) Varieties. Diversity. 2020; 12 (7):273.
Chicago/Turabian StyleMaria Papapetrou; Dimitrios Loukovitis; Orestis Papadopoulos; Zoi Kazlari; Anastasia Peristeraki; Slavina Arsenova; Desislava Bardarova; Desislava Doncheva; Serafeim Theocharis; Constantinos Karagiannidis; Stefanos Koundouras; Anastasia Giannakoula; Stamatis Aggelopoulos; Dimitrios Chatziplis. 2020. "Genetic Diversity of Local Greek and Bulgarian Grapevine (Vitis Vinifera L.) Varieties." Diversity 12, no. 7: 273.
Aim: The aim of this study was to determine and compare anthocyanin content and profile under variable irrigation regimes in four red grape cultivars (Vitis vinifera L.), the Greek indigenous cvs. Agiorgitiko and Xinomavro, alongside Syrah and Grenache noir.Methods and results: Three irrigation treatments were applied in a 6-year-old vineyard comprising all four varieties in a block design, starting at bunch closure (E-L 32) through harvest of 2012 and 2013: full irrigation (FI) at 100% of crop evapotranspiration (ETc), deficit irrigation (DI) at 50% of ETc and non-irrigated (NI). The identification of the compounds was performed by HPLC. Results showed that, under the hot summer conditions of the Greek climate, the four cultivars had a similar response regarding vigor and yield parameters, with values increasing with water supply. Anthocyanin concentration was maximized under non-irrigated conditions in all cultivars, but anthocyanin profile and relative distribution of individual anthocyanins among irrigation treatments showed a strong cultivar effect.Conclusion: Xinomavro seemed to favor the synthesis of more stable forms of anthocyanins under limited water supply (acylated over non-acylated and tri-oxygenated & methoxylated on the B-ring over di-oxygenated & hydroxylated) while Agiorgitiko had an opposite behavior, which might imply a need for a different irrigation strategy.Significance and impact of the study: To the best of our knowledge, this is the first comparative report of anthocyanin composition and profile in berry skin, under contrasting water status, for the two most important red winegrapes of Greece.
Nikolaos Theodorou; Nikolaos Nikolaou; Eleftheria Zioziou; Maria Kyraleou; Stamatina Kallithraka; Yorgos Kotseridis; Stefanos Koundouras. Anthocyanin content and composition in four red winegrape cultivars (Vitis vinifera L.) under variable irrigation. OENO One 2019, 53, 1 .
AMA StyleNikolaos Theodorou, Nikolaos Nikolaou, Eleftheria Zioziou, Maria Kyraleou, Stamatina Kallithraka, Yorgos Kotseridis, Stefanos Koundouras. Anthocyanin content and composition in four red winegrape cultivars (Vitis vinifera L.) under variable irrigation. OENO One. 2019; 53 (1):1.
Chicago/Turabian StyleNikolaos Theodorou; Nikolaos Nikolaou; Eleftheria Zioziou; Maria Kyraleou; Stamatina Kallithraka; Yorgos Kotseridis; Stefanos Koundouras. 2019. "Anthocyanin content and composition in four red winegrape cultivars (Vitis vinifera L.) under variable irrigation." OENO One 53, no. 1: 1.
BACKGROUND The effect of leaf removal on postharvest performance of dehydrated grapes has been poorly analyzed. The aim of this study was to evaluate the effect of leaf removal at veraison stage on the metabolites of fresh and dehydrated grapes of two indigenous Cypriot cultivars (‘Mavro’ and ‘Xynisteri’) that are destined for the production of ‘Commandaria’, a protected designation of origin (PDO) premium sweet wine. RESULTS Leaf removal led to a reduction of soluble solids, titratable acidity, aroma potential and most of the phenolic groups of musts of both cultivars. Dehydration led to a significant increase of all aforementioned parameters in both cultivars, being more pronounced in cv. ‘Mavro’. Interestingly, leaf removal indicated differential response in the dehydrated product of the examined cultivars; LC‐MS data showed a significant decrease of phenolic compounds in ‘Xynisteri’ must (from 66.73 to 44.15 mg L‐1), while ‘Mavro’ must registered similar values of phenolic compounds (from 94.78 to 96.72 mg L‐1), but with different distribution among phenolic groups. Intriguingly, flavonols and flavan‐3‐ols that present great health‐promoting properties, showed higher concentrations in must from defoliated dehydrated ‘Mavro’ grape. CONCLUSIONS Leaf removal at veraison stage followed by sun‐drying differentially affected the chemical composition of the examined cultivars. This preharvest application followed by postharvest dehydration was proven beneficial for cv. ‘Mavro’, while this was not the case for cv. ‘Xynisteri’. The effects of leaf removal in other developmental stages (i.e. pre/post bloom stage) need to be dissected with ultimate goal to provide an end‐product with high bioactive content. This article is protected by copyright. All rights reserved.
Savvas Constantinou; Ana Maria Gómez-Caravaca; Vlasios Goulas; Alberto Fernandez-Gutierrez; Stefanos Koundouras; George A. Manganaris. Leaf removal at veraison stage differentially affects qualitative attributes and bioactive composition of fresh and dehydrated grapes of two indigenous Cypriot cultivars. Journal of the Science of Food and Agriculture 2018, 99, 1342 -1350.
AMA StyleSavvas Constantinou, Ana Maria Gómez-Caravaca, Vlasios Goulas, Alberto Fernandez-Gutierrez, Stefanos Koundouras, George A. Manganaris. Leaf removal at veraison stage differentially affects qualitative attributes and bioactive composition of fresh and dehydrated grapes of two indigenous Cypriot cultivars. Journal of the Science of Food and Agriculture. 2018; 99 (3):1342-1350.
Chicago/Turabian StyleSavvas Constantinou; Ana Maria Gómez-Caravaca; Vlasios Goulas; Alberto Fernandez-Gutierrez; Stefanos Koundouras; George A. Manganaris. 2018. "Leaf removal at veraison stage differentially affects qualitative attributes and bioactive composition of fresh and dehydrated grapes of two indigenous Cypriot cultivars." Journal of the Science of Food and Agriculture 99, no. 3: 1342-1350.
Vineyard row orientation and canopy side exert a significant role in determining grape microclimate. The latter can be further manipulated by selective defoliation in the bunch zone. The aim of this study was to investigate the combined effects of row orientation and basal leaf removal on grape ripening of Vitis vinifera L. cv. Agiorgitiko in Nemea, Southern Greece. The experiment was conducted in 2017, on two adjacent vineyard blocks planted in 1990 on a flat site with two row orientations, North-South and East-West. Both blocks were grafted onto 41B rootstock and trained on a double cordon vertical trellis with uniform vineyard operations. Defoliation treatments included full leaf removal in the bunch zone performed at berry set and a non defoliated control, replicated three times in both blocks. Grapes were sampled at three time points from veraison to harvest from all canopy sides (i.e. E and W on North-South oriented rows and N and S on East-West oriented rows) and defoliation treatments and were analyzed for yield components and berry chemical composition. In addition, approximately 5 kg of grapes were collected from all plots and processed according to a standard winemaking protocol. Total yield and berry mass were lowest in the W-exposed and in the defoliated grapes. Must sugar and acid content, as well as wine alcohol and acidity did not depend on either factor. Skin anthocyanins and phenolics generally increased with defoliation. Skin anthocyanins and total berry phenolics were highest for north-south oriented rows, in the grapes of the cooler canopy side (E). Wines made from grapes of the E and W canopy sides showed the highest wine color, phenolic richness and the lowest pH. No interaction between row orientation and defoliation was detected for any of the measured parameters. According to the results, the E-facing grapes on the north-south oriented rows showed generally a superior grape and wine composition for Agiorgitiko variety, under the semiarid conditions of the Nemea area.
Evangelia Chorti; Serafeim Theocharis; Konstantinos Boulokostas; Stamatina Kallithraka; Yorgos Kotseridis; Stefanos Koundouras. Row Orientation and Defoliation Effects on Grape Composition of Vitis vinifera L. Agiorgitiko in Nemea (Greece). E3S Web of Conferences 2018, 50, 01039 .
AMA StyleEvangelia Chorti, Serafeim Theocharis, Konstantinos Boulokostas, Stamatina Kallithraka, Yorgos Kotseridis, Stefanos Koundouras. Row Orientation and Defoliation Effects on Grape Composition of Vitis vinifera L. Agiorgitiko in Nemea (Greece). E3S Web of Conferences. 2018; 50 ():01039.
Chicago/Turabian StyleEvangelia Chorti; Serafeim Theocharis; Konstantinos Boulokostas; Stamatina Kallithraka; Yorgos Kotseridis; Stefanos Koundouras. 2018. "Row Orientation and Defoliation Effects on Grape Composition of Vitis vinifera L. Agiorgitiko in Nemea (Greece)." E3S Web of Conferences 50, no. : 01039.
The most important characteristics upon which wines are evaluated are the intensity and complexity of their flavors. Flavor describes the combined impression created by both the volatile compounds, which are responsible for wine aroma, and the nonvolatile components, which determine the taste sensation. Environmental factors (topography, soil, climate), termed terroir, influence the levels of grape metabolites related to wine organoleptic properties, i.e. properties that can be detected by the sense organs, such as taste, color, odor, and feel. However, modern vineyard management practices have the potential to modify a vine's response to natural site influences and so modify the flavor of the resultant wine.
Stefanos Koundouras. Environmental and Viticultural Effects on Grape Composition and Wine Sensory Properties. Elements 2018, 14, 173 -178.
AMA StyleStefanos Koundouras. Environmental and Viticultural Effects on Grape Composition and Wine Sensory Properties. Elements. 2018; 14 (3):173-178.
Chicago/Turabian StyleStefanos Koundouras. 2018. "Environmental and Viticultural Effects on Grape Composition and Wine Sensory Properties." Elements 14, no. 3: 173-178.
In this study, prohexadione-Ca was applied at bloom and postbloom stages to field-grown cultivar Xinomavro to evaluate the effects on leaf chlorophyll content, water potential, photosynthesis, grape, berry size and composition and wine quality. The results showed that prohexadione-Ca increased the chlorophyll contents and net photosynthesis in early growth stages (berry set, veraison). Its effect was gradually reduced in later growth of stages. In addition, prohexadione-Ca affected the stomatal conductance mainly at later stage. In contrast, it did not show any effect on the water potential. It was also shown that the prohexadion - Ca reduced the berry size and increased skin anthocyanin and phenolic compounds. Wines provided from treated vines had improved colour and sensory attributes. Applications with prohexadione-Ca improved the resistance of grapes to Botrytis bunch rot in the first year of experiments. In contrast, no significant difference on susceptibility of grapes to Botrytis bunch rot was found in the second year of experiments. No effect of prohexadione-Ca on the susceptibility of vines to downy mildew and powdery mildew was found.
Thomas Thomidis; Eleftheria Zioziou; Stefanos Koundouras; Ioannis Navrozidis; Nikolaos Nikolaou. Effect of prohexadione-Ca on leaf chlorophyll content, gas exchange, berry size and composition, wine quality and disease susceptibility in Vitis vinifera L. cv Xinomavro. Scientia Horticulturae 2018, 238, 369 -374.
AMA StyleThomas Thomidis, Eleftheria Zioziou, Stefanos Koundouras, Ioannis Navrozidis, Nikolaos Nikolaou. Effect of prohexadione-Ca on leaf chlorophyll content, gas exchange, berry size and composition, wine quality and disease susceptibility in Vitis vinifera L. cv Xinomavro. Scientia Horticulturae. 2018; 238 ():369-374.
Chicago/Turabian StyleThomas Thomidis; Eleftheria Zioziou; Stefanos Koundouras; Ioannis Navrozidis; Nikolaos Nikolaou. 2018. "Effect of prohexadione-Ca on leaf chlorophyll content, gas exchange, berry size and composition, wine quality and disease susceptibility in Vitis vinifera L. cv Xinomavro." Scientia Horticulturae 238, no. : 369-374.
Savvas Constantinou; Ana Maria Gómez-Caravaca; Vlasios Goulas; Antonio Segura-Carretero; Stefanos Koundouras; George A. Manganaris. The impact of postharvest dehydration methods on qualitative attributes and chemical composition of ‘Xynisteri’ grape (Vitis vinifera) must. Postharvest Biology and Technology 2018, 135, 114 -122.
AMA StyleSavvas Constantinou, Ana Maria Gómez-Caravaca, Vlasios Goulas, Antonio Segura-Carretero, Stefanos Koundouras, George A. Manganaris. The impact of postharvest dehydration methods on qualitative attributes and chemical composition of ‘Xynisteri’ grape (Vitis vinifera) must. Postharvest Biology and Technology. 2018; 135 ():114-122.
Chicago/Turabian StyleSavvas Constantinou; Ana Maria Gómez-Caravaca; Vlasios Goulas; Antonio Segura-Carretero; Stefanos Koundouras; George A. Manganaris. 2018. "The impact of postharvest dehydration methods on qualitative attributes and chemical composition of ‘Xynisteri’ grape (Vitis vinifera) must." Postharvest Biology and Technology 135, no. : 114-122.
Precision viticulture is the application of site-specific techniques to vineyard production to improve grape quality and yield and minimize the negative effects on the environment. While there are various studies on the inherent spatial and temporal variability of vineyards, the assessment of the environmental impact of variable rate applications has attracted limited attention. In this study, two vineyards planted with different grapevine cultivars (Sauvignon Blanc and Syrah) were examined for four consecutive growing seasons (2013–2016). The first year, the two vineyards were only studied in terms of soil properties and crop characteristics, which resulted in the delineation of two distinct management zones for each field. For the following three years, variable rate nutrient application was applied to each management zone based on leaf canopy reflectance, where variable rate irrigation was based on soil moisture sensors, meteorological data, evapotranspiration calculation, and leaf canopy reflectance. Life cycle assessment was carried out to identify the effect of variable rate applications on vineyard agro-ecosystems. The results of variable rate nutrients and water application in the selected management zones as an average value of three growing seasons were compared to the conventional practice. It was found that the reduction of product carbon footprint (PCF) of grapes in Sauvignon Blanc between the two periods was 25% in total. Fertilizer production and distribution (direct) and application (indirect) was the most important sector of greenhouse gas (GHG) emissions reduction, accounting for 17.2%, and the within-farm energy use was the second ranked sector with 8.8% (crop residue management increase GHG emissions by 1.1%, while 0.1% GHG reduction is obtained by pesticide use). For the Syrah vineyard, where the production was less intensive, precision viticulture led to a PCF reduction of 28.3% compared to conventional production. Fertilizers contributed to this decrease by 27.6%, while within-farm energy use had an impact of 2.2% that was positive even though irrigation was increased, due to yield rise. Our results suggest that nutrient status management offers the greatest potential for reducing GHG emissions in both vineyard types. Variable rate irrigation also showed differences in comparison to conventional treatment, but to a lesser degree than variable rate fertilization. This difference between conventional practices and precision viticulture is noteworthy, and shows the potential of precision techniques to reduce the effect of viticulture on GHG emissions.
Athanasios T. Balafoutis; Stefanos Koundouras; Evangelos Anastasiou; Spyros Fountas; Konstantinos Arvanitis. Life Cycle Assessment of Two Vineyards after the Application of Precision Viticulture Techniques: A Case Study. Sustainability 2017, 9, 1997 .
AMA StyleAthanasios T. Balafoutis, Stefanos Koundouras, Evangelos Anastasiou, Spyros Fountas, Konstantinos Arvanitis. Life Cycle Assessment of Two Vineyards after the Application of Precision Viticulture Techniques: A Case Study. Sustainability. 2017; 9 (11):1997.
Chicago/Turabian StyleAthanasios T. Balafoutis; Stefanos Koundouras; Evangelos Anastasiou; Spyros Fountas; Konstantinos Arvanitis. 2017. "Life Cycle Assessment of Two Vineyards after the Application of Precision Viticulture Techniques: A Case Study." Sustainability 9, no. 11: 1997.
Climate and viticulture are indisputably linked and thus knowledge of the predominant weather and climate conditions of a given area is essential for optimum variety selection, viable production and overall wine quality. In this study, an assessment of the current (1981–2010) and future conditions (2021–2050 and 2061–2090) through principal climatic elements and six bioclimatic indices (i.e. Growing season average temperature, growing degree‐days, Huglin index, biologically effective degree‐days, dryness index and cool night index) at 23 weather stations proximal to the key mainland, coastal and island viticultural areas of Greece was performed. Mainland locations were generally colder due to their wider variety of terroir aspects and elevation, while coastal locations and islands faced proportionally more extreme temperatures and drier conditions. Trend analysis revealed that minimum temperatures increased at higher rates than the respective maximum temperatures at most locations. Climate change scenarios derived from the regional climate model RegCM4 suggested significant shifts towards warmer and drier conditions across all locations in the future. These conditions are very likely to advance phenology and harvest beyond what is considered suitable and will likely have detrimental impacts on wine quality. Differences in impacts will likely be seen between wine areas currently cultivated with early ripening (reducing variety suitability) versus those with later‐ripening (increasing consistency in ripening) varieties. Overall, the changes projected for the future climate will challenge the Greek wine industry to increase its adaptive capacity through better understanding of temperature thresholds for the varieties grown and the adoption of new cultivation techniques and strategies.
G. C. Koufos; T. Mavromatis; Stefanos Koundouras; G. V. Jones. Response of viticulture-related climatic indices and zoning to historical and future climate conditions in Greece. International Journal of Climatology 2017, 38, 2097 -2111.
AMA StyleG. C. Koufos, T. Mavromatis, Stefanos Koundouras, G. V. Jones. Response of viticulture-related climatic indices and zoning to historical and future climate conditions in Greece. International Journal of Climatology. 2017; 38 (4):2097-2111.
Chicago/Turabian StyleG. C. Koufos; T. Mavromatis; Stefanos Koundouras; G. V. Jones. 2017. "Response of viticulture-related climatic indices and zoning to historical and future climate conditions in Greece." International Journal of Climatology 38, no. 4: 2097-2111.
Tannin accumulation and composition were determined in skins and seeds isolated from Vitis vinifera cv. Syrah grapes submitted to contrasting water regimes under semiarid climatic conditions. Three irrigation treatments were conducted, starting at berry set through harvest of two growing seasons, 2011 and 2012: irrigation at 100% of crop evapotranspiration ETc (FI), irrigation at 50% of ETc (DI) and non-irrigated (NI). Seed total tannins did not vary with maturity but those of skins underwent a progressive decline (especially in 2011), expressed both on a fresh weight and on a per berry basis. Skin total tannin concentration and content per berry were increased under NI and DI conditions, mainly in 2012. In contrast, seed total tannins (in 2012) and flavan-3-ol monomers and tannin oligomers (both years) were higher in the fully irrigated vines (FI). Skin polymer size increased during ripening, NI and DI skins showing higher mean degree of polymerization (mDP) compared to FI at harvest. NI was also associated with a lower percentage of galloylation (%G) in skin oligomeric fraction (in 2012) and a lower percentage of prodelphinidins in the skin polymeric fraction (both years) at harvest. The mDP and %G of seed extracts did not vary during ripening and were higher in NI but only in 2012. According to the results, management of vine water status was shown to influence tannin amount and composition of Syrah grapes grown under semiarid conditions.
Maria Kyraleou; Stamatina Kallithraka; Nikolaos Theodorou; Pierre-Louis Teissedre; Yorgos Kotseridis; Stefanos Koundouras. Changes in Tannin Composition of Syrah Grape Skins and Seeds during Fruit Ripening under Contrasting Water Conditions. Molecules 2017, 22, 1453 .
AMA StyleMaria Kyraleou, Stamatina Kallithraka, Nikolaos Theodorou, Pierre-Louis Teissedre, Yorgos Kotseridis, Stefanos Koundouras. Changes in Tannin Composition of Syrah Grape Skins and Seeds during Fruit Ripening under Contrasting Water Conditions. Molecules. 2017; 22 (9):1453.
Chicago/Turabian StyleMaria Kyraleou; Stamatina Kallithraka; Nikolaos Theodorou; Pierre-Louis Teissedre; Yorgos Kotseridis; Stefanos Koundouras. 2017. "Changes in Tannin Composition of Syrah Grape Skins and Seeds during Fruit Ripening under Contrasting Water Conditions." Molecules 22, no. 9: 1453.
Georgia Lazoglou; Christina Anagnostopoulou; Stefanos Koundouras. Climate change projections for Greek viticulture as simulated by a regional climate model. Theoretical and Applied Climatology 2017, 133, 551 -567.
AMA StyleGeorgia Lazoglou, Christina Anagnostopoulou, Stefanos Koundouras. Climate change projections for Greek viticulture as simulated by a regional climate model. Theoretical and Applied Climatology. 2017; 133 (1-2):551-567.
Chicago/Turabian StyleGeorgia Lazoglou; Christina Anagnostopoulou; Stefanos Koundouras. 2017. "Climate change projections for Greek viticulture as simulated by a regional climate model." Theoretical and Applied Climatology 133, no. 1-2: 551-567.
Effects of foliar application of inactivated yeast on the phenolic composition of Vitis vinifera L. cv. Agiorgitiko grapes under different irrigation levels Charikleia Kogkou,1 Evangelia Chorti,2 Maria Kyraleou,1 Stamatina Kallithraka,1 Stefanos Koundouras,3 Gerard Logan,1 Ioannis Kanakis,4 Yorgos Kotseridis1 1Laboratory of Enology, Department of Food Science and Technology, Agricultural University of Athens, Athens, Greece; 2Cooperative Winery of Nemea, Nemea, Greece; 3Laboratory of Viticulture, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece; 4Fassoulis Grapevine Nurseries, Nemea, Greece Recent climate changes have caused the rising of average growing season temperatures leading to the advancement of vine phenological stages and to earlier harvests. This could result in the production of grapes with advanced berry sugar accumulation, but incomplete phenolic ripeness, thereby jeopardizing wine quality. This study aims to evaluate the effects of the application of a new product consisting of yeast derivatives on the phenolic maturity and composition of Agiorgitiko grapes and wines, under contrasting water conditions. The experiment was arranged as a 2×2 factorial design in a commercial vineyard situated in southern Greece, combining foliar spraying with LalVigne® Mature (two applications after veraison and an untreated control) and water conditions (deficit irrigation and nonirrigated). Irrigation accelerated berry sugar accumulation, increased berry weight and anthocyanin content, and decreased skin tannin concentration. Spraying with yeast derivatives did not affect phenolic content of berry components, and it had no effect on must attributes. Foliar application of yeast derivatives resulted in a higher phenolic potential of the produced wines, only when combined with irrigation. Keywords: foliar spray, deficit irrigation, phenolic maturity, anthocyanins, tannins
Charikleia Kogkou; Evangelia Chorti; Maria Kyraleou; Stamatina Kallithraka; Stefanos Koundouras; Gerard Logan; Ioannis Kanakis; Yorgos Kotseridis. Effects of foliar application of inactivated yeast on the phenolic composition of Vitis vinifera L. cv. Agiorgitiko grapes under different irrigation levels. International Journal of Wine Research 2017, ume 9, 23 -33.
AMA StyleCharikleia Kogkou, Evangelia Chorti, Maria Kyraleou, Stamatina Kallithraka, Stefanos Koundouras, Gerard Logan, Ioannis Kanakis, Yorgos Kotseridis. Effects of foliar application of inactivated yeast on the phenolic composition of Vitis vinifera L. cv. Agiorgitiko grapes under different irrigation levels. International Journal of Wine Research. 2017; ume 9 ():23-33.
Chicago/Turabian StyleCharikleia Kogkou; Evangelia Chorti; Maria Kyraleou; Stamatina Kallithraka; Stefanos Koundouras; Gerard Logan; Ioannis Kanakis; Yorgos Kotseridis. 2017. "Effects of foliar application of inactivated yeast on the phenolic composition of Vitis vinifera L. cv. Agiorgitiko grapes under different irrigation levels." International Journal of Wine Research ume 9, no. : 23-33.
Vine vigour assessment has been a major concern of precision viticulture studies in order to identify areas of uniform vine performance within vineyards. Moreover, the counting and weighing of winter dormant canes is considered as the most informative measurement to indicate vine balance and is commonly performed manually by grape growers for management purposes. The main concern of this measurement is that it is time consuming and laborious and it cannot accommodate detailed sampling density. In the present study, the potential of using laser scanner technology as an automated, easy and rapid way to perform mapping of the winter pruning wood across the vineyard was investigated. The study was conducted during 2010 and 2011, in a one hectare commercial vineyard in central Greece, planted with cv. Agiorgitiko, a traditional Greek variety for the production of red wine. Parameters of topography, soil depth, soil texture, canopy properties (NDVI), yield, and grape quality were mapped and analysed in conjunction to winter canes weighing at pruning time. The mapping of the dormant canes was carried out using a 2D laser scanner sensor prior to pruning and manually measuring the pruning weight on a 10 × 20 m grid. Laser scanner measurements showed significant relationship in both 2010 and 2011 with pruning weight (r = 0.809 and r = 0.829 respectively, p < 0.001), yield and early season NDVI, showing the potential of using laser scanner measurements to assess variability in vine vigour within vineyards. These results suggest that laser scanners offer great promise to characterize within field variability in vine performance.
A. C. Tagarakis; Stefanos Koundouras; S. Fountas; T. Gemtos. Evaluation of the use of LIDAR laser scanner to map pruning wood in vineyards and its potential for management zones delineation. Precision Agriculture 2017, 19, 334 -347.
AMA StyleA. C. Tagarakis, Stefanos Koundouras, S. Fountas, T. Gemtos. Evaluation of the use of LIDAR laser scanner to map pruning wood in vineyards and its potential for management zones delineation. Precision Agriculture. 2017; 19 (2):334-347.
Chicago/Turabian StyleA. C. Tagarakis; Stefanos Koundouras; S. Fountas; T. Gemtos. 2017. "Evaluation of the use of LIDAR laser scanner to map pruning wood in vineyards and its potential for management zones delineation." Precision Agriculture 19, no. 2: 334-347.
Thomas Thomidis; Eleftheria Zioziou; Stefanos Koundouras; Constantinos Karagiannidis; Ioannis Navrozidis; Nikolaos Nikolaou. Effects of nitrogen and irrigation on the quality of grapes and the susceptibility to Botrytis bunch rot. Scientia Horticulturae 2016, 212, 60 -68.
AMA StyleThomas Thomidis, Eleftheria Zioziou, Stefanos Koundouras, Constantinos Karagiannidis, Ioannis Navrozidis, Nikolaos Nikolaou. Effects of nitrogen and irrigation on the quality of grapes and the susceptibility to Botrytis bunch rot. Scientia Horticulturae. 2016; 212 ():60-68.
Chicago/Turabian StyleThomas Thomidis; Eleftheria Zioziou; Stefanos Koundouras; Constantinos Karagiannidis; Ioannis Navrozidis; Nikolaos Nikolaou. 2016. "Effects of nitrogen and irrigation on the quality of grapes and the susceptibility to Botrytis bunch rot." Scientia Horticulturae 212, no. : 60-68.
T. Sotiropoulos; Antonios Petridis; M. Koukourikou-Petridou; S. Koundouras. Evaluation of ‘Sun Protect’ in protecting apples (Malus × domestica Borkh.) against sunburn. Horticultural Science 2016, 43, 175 -180.
AMA StyleT. Sotiropoulos, Antonios Petridis, M. Koukourikou-Petridou, S. Koundouras. Evaluation of ‘Sun Protect’ in protecting apples (Malus × domestica Borkh.) against sunburn. Horticultural Science. 2016; 43 (No. 4):175-180.
Chicago/Turabian StyleT. Sotiropoulos; Antonios Petridis; M. Koukourikou-Petridou; S. Koundouras. 2016. "Evaluation of ‘Sun Protect’ in protecting apples (Malus × domestica Borkh.) against sunburn." Horticultural Science 43, no. No. 4: 175-180.
In this work, the effect of water availability on astringency of seed and skin extracts of Vitis vinifera cv. Syrah berries under the typical semiarid conditions of Greece was investigated. Moreover, astringency was assessed in relation to proanthocyanidin composition. For this purpose, three irrigation treatments were applied starting at berry set through harvest of 2011 and 2012: full irrigation (FI) at 100% of crop evapotranspiration, deficit irrigation (DI) at 50% and non-irrigated (NI). FI skin and seed extracts were perceived significantly more astringent than NI. Total phenol, total tannin, (+)-catechin, (−)-epicatechin and procyanidin C1 concentrations were positively correlated with astringency. Positive correlations were also obtained among astringency and average degree of polymerization and proportion of the extension units of shorter tannins while astringency of larger tannins was correlated with the proportion of terminal units. On the contrary, total anthocyanin and epigallocatechin contents were negatively correlated with astringency.
Maria Kyraleou; Yorgos Kotseridis; Stefanos Koundouras; Kleopatra Chira; Pierre-Louis Teissedre; Stamatina Kallithraka. Effect of irrigation regime on perceived astringency and proanthocyanidin composition of skins and seeds of Vitis vinifera L. cv. Syrah grapes under semiarid conditions. Food Chemistry 2016, 203, 292 -300.
AMA StyleMaria Kyraleou, Yorgos Kotseridis, Stefanos Koundouras, Kleopatra Chira, Pierre-Louis Teissedre, Stamatina Kallithraka. Effect of irrigation regime on perceived astringency and proanthocyanidin composition of skins and seeds of Vitis vinifera L. cv. Syrah grapes under semiarid conditions. Food Chemistry. 2016; 203 ():292-300.
Chicago/Turabian StyleMaria Kyraleou; Yorgos Kotseridis; Stefanos Koundouras; Kleopatra Chira; Pierre-Louis Teissedre; Stamatina Kallithraka. 2016. "Effect of irrigation regime on perceived astringency and proanthocyanidin composition of skins and seeds of Vitis vinifera L. cv. Syrah grapes under semiarid conditions." Food Chemistry 203, no. : 292-300.
Vitis vinifera L. cv. ‘Agiorgitiko’ is one of the most important red grape varieties of Greece, cultivated almost exclusively in the region of Nemea in north-eastern Peloponnese. This work aimed to study the influence of some commonly applied viticultural practices on the polyphenolic composition of ‘Agiorgitiko’. Leaf removal at veraison, irrigation, and a combination of both, were applied and the phenolic content of the grapes and of the produced wines was compared. The results showed that leaf removal decreased berry size, enhanced total anthocyanin, total phenol and malvidin 3-O-monoglucoside accumulation in skins and increased the amount of extractable anthocyanins in the juice. The combination of irrigation and leaf removal caused a significant increase in total phenols in the skin and in the amount of extractable anthocyanins in juice. As far as the produced wines were concerned, color intensity, tannin content and total polyphenols were increased due to leaf removal. Both irrigation and leaf removal resulted in wines with the highest concentration of malvidin 3-O-monoglucoside, although neither practice resulted in any significant difference in anthocyanin concentration of the wines. Vines where only irrigation was applied produced berries with reduced extractable anthocyanins, increased seed total phenols and lower wine total tannins. The study showed that increasing cluster sun exposure of ‘Agiorgitiko’ vines may be, overall, beneficial to the quality of the produced wine.
Evangelia Chorti; Maria Kyraleou; Stamatina Kallithraka; Manolis Pavlidis; Stefanos Koundouras; Yorgos Kotseridis. Irrigation and Leaf Removal Effects on Polyphenolic Content of Grapes and Wines Produced from cv. ‘Agiorgitiko’ (Vitis vinifera L.). Notulae Botanicae Horti Agrobotanici Cluj-Napoca 2016, 44, 133 -139.
AMA StyleEvangelia Chorti, Maria Kyraleou, Stamatina Kallithraka, Manolis Pavlidis, Stefanos Koundouras, Yorgos Kotseridis. Irrigation and Leaf Removal Effects on Polyphenolic Content of Grapes and Wines Produced from cv. ‘Agiorgitiko’ (Vitis vinifera L.). Notulae Botanicae Horti Agrobotanici Cluj-Napoca. 2016; 44 (1):133-139.
Chicago/Turabian StyleEvangelia Chorti; Maria Kyraleou; Stamatina Kallithraka; Manolis Pavlidis; Stefanos Koundouras; Yorgos Kotseridis. 2016. "Irrigation and Leaf Removal Effects on Polyphenolic Content of Grapes and Wines Produced from cv. ‘Agiorgitiko’ (Vitis vinifera L.)." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 44, no. 1: 133-139.
Irrigation management is a powerful technique to control grape and wine colour. However, water deficit effects on anthocyanins are often contrasting depending on the severity of water restriction. In addition, the effect of irrigation on the antiradical capacity of grapes has not been extensively studied. In this work, the effect of water availability on anthocyanin profile and content, as well as on the antioxidant activity of Syrah grapes was investigated in an irrigation trial under semiarid climate conditions. Three irrigation treatments were applied in a 15 year‐old Vitis vinifera cv. Syrah vineyard, starting at berry set through harvest of 2011 and 2012: full irrigation (FI) at 100% of crop evapotranspiration (ETc), deficit irrigation (DI) at 50% of ETc and non‐irrigated (NI). NI grapes were characterized by increased individual anthocyanin content. However, differences among irrigation treatments were significant only around 18–24 days after veraison, when anthocyanin accumulation was maximum. The antioxidant activity of the skin extracts was not affected by irrigation. Irrigation proved to be an effective technique to control anthocyanin content in Syrah grapes, under semiarid conditions. However, anthocyanin accumulation pattern should be considered by winemakers to appropriately select harvest time for improved wine color.
Maria Kyraleou; Stefanos Koundouras; Stamatina Kallithraka; Nikolaos Theodorou; Niki Proxenia; Yorgos Kotseridis. Effect of irrigation regime on anthocyanin content and antioxidant activity of Vitis vinifera L. cv. Syrah grapes under semiarid conditions. Journal of the Science of Food and Agriculture 2015, 96, 988 -996.
AMA StyleMaria Kyraleou, Stefanos Koundouras, Stamatina Kallithraka, Nikolaos Theodorou, Niki Proxenia, Yorgos Kotseridis. Effect of irrigation regime on anthocyanin content and antioxidant activity of Vitis vinifera L. cv. Syrah grapes under semiarid conditions. Journal of the Science of Food and Agriculture. 2015; 96 (3):988-996.
Chicago/Turabian StyleMaria Kyraleou; Stefanos Koundouras; Stamatina Kallithraka; Nikolaos Theodorou; Niki Proxenia; Yorgos Kotseridis. 2015. "Effect of irrigation regime on anthocyanin content and antioxidant activity of Vitis vinifera L. cv. Syrah grapes under semiarid conditions." Journal of the Science of Food and Agriculture 96, no. 3: 988-996.