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Prof. Anastasios Siomos
Department of Horticulture, Aristotle University of Thessaloniki

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0 Postharvest Physiology
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0 vegetable crops
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Research article
Published: 18 June 2021 in Journal of the Science of Food and Agriculture
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BACKGROUND Nutritional quality in bell pepper is related to the ripening stage of the fruit at harvest and postharvest storage. Its determination requires time-consuming, tissue-destructive, analytical laboratory techniques. The objective of this study was to investigate the effect of ripening stage and of postharvest storage period on fruit nutritional quality, and whether it is feasible to develop reliable models for assessing the nutritional components in peppers using non-destructive methods. The dry matter, soluble solids, ascorbic acid, phenolics, chlorophylls, carotenoids and the total antioxidant capacity were determined in bell pepper fruits at six ripening stages, from green to full red, during storage at 10 °C for 8 days. Color, chlorophyll fluorescence, visible/near infrared (Vis/NIR) spectroscopy, red-green-blue (R-G-B) and red-green-near infrared (R-G-NIR) digital imaging were tested for assessing the nutritional quality of peppers. RESULTS The nutritional composition was mainly affected by the ripening stage of bell pepper fruits at harvest and only to a small degree by the storage period. Indeed, the more advanced ripening stage of fruit at harvest resulted in superior nutritional quality. Most of the non-destructive techniques reliably predicted the internal quality of the fruit. The genetic algorithm (GA), the variable importance in projection (VIP) scores, and the variable inflation factor (VIF) tests identified nine distinct regions and four specific wavelengths on the whole visible/NIR electromagnetic spectrum that exhibited the most significant effect in the assessment of the nutritional components. CONCLUSION It is possible to predict individual nutritional components in bell pepper fruit reliably and non-destructively, and irrespective of the ripening stage of fruits at harvest. © 2021 Society of Chemical Industry.

ACS Style

Dimitrios S. Kasampalis; Pavlos Tsouvaltzis; Konstantinos Ntouros; Athanasios Gertsis; Ioannis Gitas; Dimitrios Moshou; Anastasios S. Siomos. Nutritional composition changes in bell pepper as affected by the ripening stage of fruits at harvest or postharvest storage and assessed non‐destructively. Journal of the Science of Food and Agriculture 2021, 1 .

AMA Style

Dimitrios S. Kasampalis, Pavlos Tsouvaltzis, Konstantinos Ntouros, Athanasios Gertsis, Ioannis Gitas, Dimitrios Moshou, Anastasios S. Siomos. Nutritional composition changes in bell pepper as affected by the ripening stage of fruits at harvest or postharvest storage and assessed non‐destructively. Journal of the Science of Food and Agriculture. 2021; ():1.

Chicago/Turabian Style

Dimitrios S. Kasampalis; Pavlos Tsouvaltzis; Konstantinos Ntouros; Athanasios Gertsis; Ioannis Gitas; Dimitrios Moshou; Anastasios S. Siomos. 2021. "Nutritional composition changes in bell pepper as affected by the ripening stage of fruits at harvest or postharvest storage and assessed non‐destructively." Journal of the Science of Food and Agriculture , no. : 1.

Journal article
Published: 08 June 2021 in Agronomy
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A floating system was established in a heated glass greenhouse in order to investigate whether the effect of amino acids (0.25 or 0.50% of a commercial amino acid (AA) solution Amino16®) during peppermint and spearmint production on plant developmental and nutritional status may be in part attributed to salinity induced osmotic stress. For this reason, in some nutrient solutions, three levels of salinity were induced by adding 0, 10, or 20 mM NaCl. According to the results, it can be concluded that spearmint is mostly favored by the highest amino acid supplement of the nutrient solution (0.50%) in terms of a substantial improvement of the antioxidant nutritional quality (by up to 130%) at the expense of a reduced biomass production (by <30%). Enzymic antioxidant defense mechanism (APX and POD) was efficiently activated, preventing severe lipid peroxidation and the accumulation of reactive oxygen species such as H2O2 and maintaining the proline content at the normal levels. The osmotic stress that was induced by the excessive AA concentration and confirmed by the chlorophyl fluorescence variations was probably related to NH4+ excess supply in the growing media and was not associated with the elevated electrical conductivity in the solution. The absence of any adverse stressful consequences upon the addition of 20 mM NaCl may be attributed to the high salt tolerance of peppermint and spearmint species.

ACS Style

Dimitrios Kasampalis; Danai-Christina Aktsoglou; Pavlos Tsouvaltzis; Anastasios Siomos. Responses of Peppermint and Spearmint Crops to Excessive Biostimulant Application and Increased Salinity in a Closed Soilless Production System. Agronomy 2021, 11, 1168 .

AMA Style

Dimitrios Kasampalis, Danai-Christina Aktsoglou, Pavlos Tsouvaltzis, Anastasios Siomos. Responses of Peppermint and Spearmint Crops to Excessive Biostimulant Application and Increased Salinity in a Closed Soilless Production System. Agronomy. 2021; 11 (6):1168.

Chicago/Turabian Style

Dimitrios Kasampalis; Danai-Christina Aktsoglou; Pavlos Tsouvaltzis; Anastasios Siomos. 2021. "Responses of Peppermint and Spearmint Crops to Excessive Biostimulant Application and Increased Salinity in a Closed Soilless Production System." Agronomy 11, no. 6: 1168.

Journal article
Published: 16 March 2021 in Applied Sciences
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Background: Quality and safety of potato is both cultivar and postharvest management dependent. The precise assessment of freshness and cultivar are complex tasks requiring time-consuming, expensive, and destructive techniques. Method: Potatoes from three commercial cultivars were stored for 5 months at 5 °C. Color and chlorophyll fluorescence were recorded, Red-Green-Blue (R-G-B), Red-Green-Near infrared (R-G-NIR) and Red-Blue-Near infrared (R-B-NIR) digital images, as well as hyperspectral images were acquired both on the external periderm of the tuber and in the inner flesh part. Partial least square regression (PLSR) and discriminant analysis, combined with feature selection techniques were implemented, in order to assess the potato freshness and to classify them into the respective genotypes. Results: The PLSR analysis of visible/near infrared (Vis/NIR) spectra reflectance most reliably predicted potato freshness, with a cross-validated regression coefficient equal to 0.981 and 0.947, as determined by external or internal measurements, respectively. Variance inflation factor, variable importance scores, and genetic algorithms identified specific wavelength regions that mostly affected the accuracy of the model in terms of strongest regression and lowest collinearity and root mean cross validation error. Conclusions: Vis/NIR spectra reflectance data from the skin of the potato tubers may be reliably used in the assessment of postharvest storage life, as well as in the cultivar discrimination process.

ACS Style

Dimitrios Kasampalis; Pavlos Tsouvaltzis; Konstantinos Ntouros; Athanasios Gertsis; Dimitrios Moshou; Anastasios Siomos. Rapid Nondestructive Postharvest Potato Freshness and Cultivar Discrimination Assessment. Applied Sciences 2021, 11, 2630 .

AMA Style

Dimitrios Kasampalis, Pavlos Tsouvaltzis, Konstantinos Ntouros, Athanasios Gertsis, Dimitrios Moshou, Anastasios Siomos. Rapid Nondestructive Postharvest Potato Freshness and Cultivar Discrimination Assessment. Applied Sciences. 2021; 11 (6):2630.

Chicago/Turabian Style

Dimitrios Kasampalis; Pavlos Tsouvaltzis; Konstantinos Ntouros; Athanasios Gertsis; Dimitrios Moshou; Anastasios Siomos. 2021. "Rapid Nondestructive Postharvest Potato Freshness and Cultivar Discrimination Assessment." Applied Sciences 11, no. 6: 2630.

Journal article
Published: 11 February 2021 in Agronomy
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The present study investigated the potential of fresh peppermint (Mentha × piperita L.) and spearmint (Mentha spicata L.) production on a floating raft system combined with a commercial protein hydrolysate supplement (Amino16®) in a nutrient solution aiming to improve plant product quality. Three levels of the protein hydrolysate solution (0, 0.25 and 0.50%) were added in the nutrient solution, and the plants were harvested after twenty-four days. Plant growth characteristics were recorded, and nutritional, essential oil and polyphenolic composition were determined in fresh tissue. The addition of protein hydrolysates did not affect the fresh or dry weight but reduced plant height. Nitrate content significantly decreased, while total chlorophyll and essential oil content increased in both species. Moreover, the protein hydrolysate solution further increased total antioxidant capacity, total soluble phenol and carotenoid contents in spearmint plants, while it did not affect the essential oil and polyphenolic composition in both species. In conclusion, protein hydrolysates solution may be added in the nutrient solution, to improve the quality of peppermint and spearmint grown in a floating system, without adverse effects on crop yield or the essential oil and polyphenolic profile.

ACS Style

Danai-Christina Aktsoglou; Dimitrios S. Kasampalis; Eirini Sarrou; Pavlos Tsouvaltzis; Paschalina Chatzopoulou; Stefan Martens; Anastasios S. Siomos. Protein Hydrolysates Supplement in the Nutrient Solution of Soilless Grown Fresh Peppermint and Spearmint as a Tool for Improving Product Quality. Agronomy 2021, 11, 317 .

AMA Style

Danai-Christina Aktsoglou, Dimitrios S. Kasampalis, Eirini Sarrou, Pavlos Tsouvaltzis, Paschalina Chatzopoulou, Stefan Martens, Anastasios S. Siomos. Protein Hydrolysates Supplement in the Nutrient Solution of Soilless Grown Fresh Peppermint and Spearmint as a Tool for Improving Product Quality. Agronomy. 2021; 11 (2):317.

Chicago/Turabian Style

Danai-Christina Aktsoglou; Dimitrios S. Kasampalis; Eirini Sarrou; Pavlos Tsouvaltzis; Paschalina Chatzopoulou; Stefan Martens; Anastasios S. Siomos. 2021. "Protein Hydrolysates Supplement in the Nutrient Solution of Soilless Grown Fresh Peppermint and Spearmint as a Tool for Improving Product Quality." Agronomy 11, no. 2: 317.

Journal article
Published: 13 January 2021 in Nitrogen
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Seven winter and five summer vegetables produced under organic and conventional systems were collected from a supermarket seven times between January and April and between July and October for winter and summer vegetables, respectively, and their ascorbic acid and total phenolic content (compounds with proven antioxidant activity) as well as total antioxidant capacity, soluble solids and nitrates were determined. The results clearly indicated that, from the three factors studied (vegetable species, cropping system and sampling time), vegetable species made the highest contribution to ascorbic acid, phenolics, antioxidant capacity, soluble solids and nitrates. Results for each vegetable species showed that most organic vegetables appear to have lower nitrate content, some have higher phenolics, antioxidant capacity and soluble solids, and only few have higher ascorbic acid compared with conventional vegetables. The significance of the differences in nutritional and antioxidant value between organic and conventional vegetables is questionable, since vegetable species and sampling time can affect their nutritional value to a great or greater extent than the cropping system.

ACS Style

Constantinos Roumeliotis; Anastasios S. Siomos; Dimitrios Gerasopoulos. Comparative Nutritional and Antioxidant Compounds of Organic and Conventional Vegetables during the Main Market Availability Period. Nitrogen 2021, 2, 18 -29.

AMA Style

Constantinos Roumeliotis, Anastasios S. Siomos, Dimitrios Gerasopoulos. Comparative Nutritional and Antioxidant Compounds of Organic and Conventional Vegetables during the Main Market Availability Period. Nitrogen. 2021; 2 (1):18-29.

Chicago/Turabian Style

Constantinos Roumeliotis; Anastasios S. Siomos; Dimitrios Gerasopoulos. 2021. "Comparative Nutritional and Antioxidant Compounds of Organic and Conventional Vegetables during the Main Market Availability Period." Nitrogen 2, no. 1: 18-29.

Journal article
Published: 03 August 2020 in Agriculture
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Watermelon is mainly grafted onto interspecific squash, and during the season of high demand, seedlings of variable quality are used to cover grafting needs. The objective was to combine watermelon and interspecific squash of different seedling quality categories in order to obtain the optimal combination for the production of high-quality grafted watermelon seedlings. Acceptable seedlings of both species were grouped into quality categories, namely “low”, “optimum”, and “high”. Seedlings of each quality category were combined with each other and grafted seedlings from the nine derived categories were evaluated at two time intervals, at 7 (exit from the healing chamber) and 14 (final product) days after grafting. At both time intervals, watermelon “high” combined with interspecific squash “optimum” exhibited relatively higher shoot length, stem diameter, leaf area, and shoot and root dry weight, as well as shoot dry weight-to-length ratio, which is a quality index. The study shows that watermelon scions should have “high” quality, while interspecific squash rootstocks should have “optimum” quality during grafting for the production of high-quality grafted plants. If possible, “low” to-be-grafted watermelon seedlings should be avoided because the grafted derived seedlings are considered low quality.

ACS Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Christodoulos Dangitsis. Impact of Scion and Rootstock Seedling Quality Selection on the Vigor of Watermelon–Interspecific Squash Grafted Seedlings. Agriculture 2020, 10, 326 .

AMA Style

Filippos Bantis, Athanasios Koukounaras, Anastasios Siomos, Christodoulos Dangitsis. Impact of Scion and Rootstock Seedling Quality Selection on the Vigor of Watermelon–Interspecific Squash Grafted Seedlings. Agriculture. 2020; 10 (8):326.

Chicago/Turabian Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Christodoulos Dangitsis. 2020. "Impact of Scion and Rootstock Seedling Quality Selection on the Vigor of Watermelon–Interspecific Squash Grafted Seedlings." Agriculture 10, no. 8: 326.

Journal article
Published: 27 June 2020 in Agronomy
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Excessive nitrogen fertilization results in nitrate accumulation in leafy vegetables. Reducing the dose of mineral nitrogen or using alternate fertilizers lowers the nitrate accumulation; however, a critical minimum level of mineral nitrogen is necessary to maintain yield and nutritional quality. The aim of this study was to evaluate the effect of two levels of mineral nitrogen (100% and 50%) and three levels of an amino acid solution (0, 0.3, and 0.9%) in the nutrient solution of two baby lettuce cultivars (green and red) grown in a floating system. Nitrogen reduction did not affect yield (12.9–13.4 and 11.0–11.3 g/plant, respectively) but reduced nitrate accumulation (by 43 and 19%, respectively) in both green and red lettuce, while enhancing phenolic content (by 28%) and antioxidant capacity (by 69%) in green lettuce and soluble solid (by 7%) and total chlorophyll content (by 9%) in red lettuce. Although nitrate accumulation was prevented (< 355 mg/kg FW) and most nutritional components increased in both lettuce types by amino acids supplementation, plant growth was negatively affected, especially in red lettuce, in both concentrations of amino acids (reduction by 9 and 35% in 0.3 and 0.9%, respectively). In both lettuce types, proline content increased by 0.9% amino acids supplementation (by 45%), implying a probable induction of a stress condition. Mineral nutrients were slightly affected by nitrogen reduction, which was probably perceived as an abiotic stress.

ACS Style

Pavlos Tsouvaltzis; Dimitrios S. Kasampalis; Danai-Christina Aktsoglou; Nikolaos Barbayiannis; Anastasios S. Siomos. Effect of Reduced Nitrogen and Supplemented Amino Acids Nutrient Solution on the Nutritional Quality of Baby Green and Red Lettuce Grown in a Floating System. Agronomy 2020, 10, 922 .

AMA Style

Pavlos Tsouvaltzis, Dimitrios S. Kasampalis, Danai-Christina Aktsoglou, Nikolaos Barbayiannis, Anastasios S. Siomos. Effect of Reduced Nitrogen and Supplemented Amino Acids Nutrient Solution on the Nutritional Quality of Baby Green and Red Lettuce Grown in a Floating System. Agronomy. 2020; 10 (7):922.

Chicago/Turabian Style

Pavlos Tsouvaltzis; Dimitrios S. Kasampalis; Danai-Christina Aktsoglou; Nikolaos Barbayiannis; Anastasios S. Siomos. 2020. "Effect of Reduced Nitrogen and Supplemented Amino Acids Nutrient Solution on the Nutritional Quality of Baby Green and Red Lettuce Grown in a Floating System." Agronomy 10, no. 7: 922.

Journal article
Published: 10 December 2019 in Agronomy
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Watermelon is cultivated worldwide and is mainly grafted onto interspecific squash rootstocks. Light-emitting diodes (LEDs) can be implemented as light sources during indoor production of both species and their spectral quality is of great importance. The objective of the present study was to determine the optimal emission of LEDs with wide wavelength for the production of watermelon and interspecific squash seedlings in a growth chamber. Conditions were set at 22/20 °C temperature (day/night), 16 h photoperiod, and 85 ± 5 μmol m−2 s−1 photosynthetic photon flux density. Illumination was provided by fluorescent (FL, T0) lamps or four LEDs (T1, T2, T3, and T4) emitting varying wide spectra. Watermelon seedlings had greater shoot length, stem diameter, cotyledon area, shoot dry weight-to-length (DW/L) ratio, and Dickson’s quality index (DQI) under T1 and T3, while leaf area and shoot dry weight (DW) had higher values under T1. Interspecific squash seedlings had greater stem diameter, and shoot and root DW under T1 and T3, while leaf and cotyledon areas were favored under T1. In both species, T0 showed inferior development. It could be concluded that a light source with high red emission, relatively low blue emission, and a red:far-red ratio of about 3 units seems ideal for the production of high-quality watermelon (scion) and interspecific squash (rootstock) seedlings.

ACS Style

Filippos Bantis; Athanasios Koukounaras; Anastasios S. Siomos; Kalliopi Radoglou; Christodoulos Dangitsis. Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting. Agronomy 2019, 9, 870 .

AMA Style

Filippos Bantis, Athanasios Koukounaras, Anastasios S. Siomos, Kalliopi Radoglou, Christodoulos Dangitsis. Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting. Agronomy. 2019; 9 (12):870.

Chicago/Turabian Style

Filippos Bantis; Athanasios Koukounaras; Anastasios S. Siomos; Kalliopi Radoglou; Christodoulos Dangitsis. 2019. "Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting." Agronomy 9, no. 12: 870.

Journal article
Published: 26 November 2019 in Postharvest Biology and Technology
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Tomato fruit classification and postharvest ripening monitoring based on maturity stage of fruit at the time of harvest are necessary, in order to guarantee the highest possible quality and marketability of the final ripe product. The aim of this study was to investigate if three non-destructive innovative and convenient protocols, in terms of rapidness, accuracy and expense, can be exploited in the discrimination of the maturity stage of tomato fruit and in the assessment of the pericarp’s pigments content, as well as in the monitoring of the postharvest ripening of tomato fruit during storage. These protocols included the measurement chlorophyll fluorescence (OJIP), the non-photochemical quenching of photosystem (NPQ) and the light harvesting complex (LHC). The efficiency of these methods was compared to that of the colorimeter, which is widely used for such purpose. According to the results, specific parameters of all the three protocols can classify the tomato fruit according to their maturity stage, as efficiently as the hue angle parameter of the color measurements. Additionally, certain parameters of these protocols were identified that can monitor the tomato fruit ripening during storage more reliably even compared to the colorimeter parameters, while also being strongly correlated with the tomato fruit pericarp pigments’ content. Among the three protocols, the OJIP is the most accurate one which also excels in generating data faster than the rest. Moreover, the ‘fix area’ parameter of the OJIP protocol retains the efficiency to discriminate fruit during 16 days of storage according to their initial ripening stage at harvest, even when all tomatoes turn red, in contrast to hue angle parameter, which was less efficient in distinguishing the different initial maturity stages, beyond the 8th day of storage. Models based on ‘fix area’ parameter better reflect the actual ripening process of fruit per maturity stage than the ones based on hue angle data.

ACS Style

Dimitrios S. Kasampalis; Pavlos Tsouvaltzis; Anastasios Siomos. Chlorophyll fluorescence, non-photochemical quenching and light harvesting complex as alternatives to color measurement, in classifying tomato fruit according to their maturity stage at harvest and in monitoring postharvest ripening during storage. Postharvest Biology and Technology 2019, 161, 111036 .

AMA Style

Dimitrios S. Kasampalis, Pavlos Tsouvaltzis, Anastasios Siomos. Chlorophyll fluorescence, non-photochemical quenching and light harvesting complex as alternatives to color measurement, in classifying tomato fruit according to their maturity stage at harvest and in monitoring postharvest ripening during storage. Postharvest Biology and Technology. 2019; 161 ():111036.

Chicago/Turabian Style

Dimitrios S. Kasampalis; Pavlos Tsouvaltzis; Anastasios Siomos. 2019. "Chlorophyll fluorescence, non-photochemical quenching and light harvesting complex as alternatives to color measurement, in classifying tomato fruit according to their maturity stage at harvest and in monitoring postharvest ripening during storage." Postharvest Biology and Technology 161, no. : 111036.

Journal article
Published: 17 November 2019 in Scientia Horticulturae
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Watermelon is an economically important crop that is exclusively established through the use of grafted seedlings. Grafting procedure and the period of healing are critical for the production of high quality seedlings. During healing, grafted seedlings are grown in a chamber with controlled conditions, including supplementary lighting. The aim of the present study was to evaluate the impact of commonly used fluorescent (FL, control) lamps or light-emitting diodes (LEDs) with varying red (R) and blue (B) proportions [100 % R (R), 12 % B and 88 % R (12B), 24 % B and 76 % R (24B), 36 % B and 64 % R (36B) or 100 % B (B)] employed in the healing chamber on the quality of grafted watermelon seedlings. Seedlings under FL and B performed poorly in almost all tested parameters compared to the other LEDs. However, monochromatic B led to the greatest rates of photosynthesis (Pmax), stomatal conductance (g) and transpiration (E). On the contrary, R promoted the seedling length, fresh and dry weight (FW and DW) of shoots and roots, and root-to-shoot ratio (R/S) but led to inferior gas exchange and photosynthetic efficiency (Fv/Fm). B addition to R light (12B and 24B) enhanced the morphological and growth characteristics tested at least as much as R light or even more (leaf area, shoot DW). It should be noted that the entire root system of the seedlings was cut off during the grafting procedure and its re-growth was highly promoted by dichromatic LEDs (R plus B). Altogether, the above results demonstrate that R light with addition of low proportion of B light (12–24%) enhances the production of high quality grafted watermelon seedlings.

ACS Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Mariangela N. Fotelli; Damianos Kintzonidis. Bichromatic red and blue LEDs during healing enhance the vegetative growth and quality of grafted watermelon seedlings. Scientia Horticulturae 2019, 261, 109000 .

AMA Style

Filippos Bantis, Athanasios Koukounaras, Anastasios Siomos, Mariangela N. Fotelli, Damianos Kintzonidis. Bichromatic red and blue LEDs during healing enhance the vegetative growth and quality of grafted watermelon seedlings. Scientia Horticulturae. 2019; 261 ():109000.

Chicago/Turabian Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Mariangela N. Fotelli; Damianos Kintzonidis. 2019. "Bichromatic red and blue LEDs during healing enhance the vegetative growth and quality of grafted watermelon seedlings." Scientia Horticulturae 261, no. : 109000.

Short communication
Published: 05 October 2019 in Food Packaging and Shelf Life
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Active modified atmosphere (active MAP) is commonly used for browning control of fresh-cut lettuce. However, it induces a disorder which is first reported in this study, described as ‘leaf collapse’. This study attempt to evaluate the possible factors involved in the development of this physiological disorder. Therefore, minimally processed romaine leaves of a sensitive and a resistant cultivar were stored under three different conditions (active MAP, passive MAP, air) for 6 days at 4 °C. The results showed that the development of leaf collapse was correlated with the interaction of cultivar and atmosphere composition. No correlation among leaf calcium content as well as leaf age with collapse index was recorded. On the contrary, results showed increased C2H4 production and membrane permeability of the sensitive lettuce cultivar as well as C2H4 accumulation in packages during storage under active MAP conditions compared to tolerant one.

ACS Style

Athanasios Koukounaras; Anastasios Siomos; Dimitrios Gerasopoulos; Michalis Papachristodoulou. Active modified atmosphere package induced a new physiological disorder of minimally processed romaine lettuce leaves. Food Packaging and Shelf Life 2019, 22, 100411 .

AMA Style

Athanasios Koukounaras, Anastasios Siomos, Dimitrios Gerasopoulos, Michalis Papachristodoulou. Active modified atmosphere package induced a new physiological disorder of minimally processed romaine lettuce leaves. Food Packaging and Shelf Life. 2019; 22 ():100411.

Chicago/Turabian Style

Athanasios Koukounaras; Anastasios Siomos; Dimitrios Gerasopoulos; Michalis Papachristodoulou. 2019. "Active modified atmosphere package induced a new physiological disorder of minimally processed romaine lettuce leaves." Food Packaging and Shelf Life 22, no. : 100411.

Journal article
Published: 29 May 2019 in Food Chemistry
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Sea fennel is an herbaceous aromatic and edible halophyte, naturally occurring in coastal areas of the Mediterranean basin. Besides its scientific interest as a salt-tolerant species it exhibits considerable nutritional value and economical potential. As sea fennel is distributed in maritime areas, where natural iodine is available in high concentrations, the aim of this study was to evaluate whether sea fennel has the potential to accumulate elevated iodine concentrations under cultivation. A biofortification experiment in a hydroponic system applying two forms of iodine, KI and KIO3 in different concentrations was set up and monitored using sophisticated targeted elementary and metabolite analysis. The biofortification potential and possible effects on nutritional value were investigated. This study revealed that both iodine forms increased the iodine content of sea fennel tissues. Nutritional and health promoting components, biomass production but also antioxidant potential were stable or even improved under the iodine treatments.

ACS Style

Eirini Sarrou; Anastasios Siomos; Samantha Riccadona; Danai-Christina Aktsoglou; Pavlos Tsouvaltzis; Andrea Angeli; Pietro Franceschi; Paschalina Chatzopoulou; Urska Vrhovsek; Stefan Martens. Improvement of sea fennel (Crithmum maritimum L.) nutritional value through iodine biofortification in a hydroponic floating system. Food Chemistry 2019, 296, 150 -159.

AMA Style

Eirini Sarrou, Anastasios Siomos, Samantha Riccadona, Danai-Christina Aktsoglou, Pavlos Tsouvaltzis, Andrea Angeli, Pietro Franceschi, Paschalina Chatzopoulou, Urska Vrhovsek, Stefan Martens. Improvement of sea fennel (Crithmum maritimum L.) nutritional value through iodine biofortification in a hydroponic floating system. Food Chemistry. 2019; 296 ():150-159.

Chicago/Turabian Style

Eirini Sarrou; Anastasios Siomos; Samantha Riccadona; Danai-Christina Aktsoglou; Pavlos Tsouvaltzis; Andrea Angeli; Pietro Franceschi; Paschalina Chatzopoulou; Urska Vrhovsek; Stefan Martens. 2019. "Improvement of sea fennel (Crithmum maritimum L.) nutritional value through iodine biofortification in a hydroponic floating system." Food Chemistry 296, no. : 150-159.

Journal article
Published: 02 February 2019 in Horticulturae
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Vegetable grafting is a practice employed worldwide since it helps prevent biotic and abiotic disorders, and watermelon is one of the most important species grafted. The objective of this study was to set critical limits for the characterization of quality categories for grafted watermelon seedlings. Specifically, watermelon (scion) seedlings were grafted onto squash (rootstock) seedlings, moved into a healing chamber for 7 days, and then transferred into a greenhouse for seven more days. At 7 and 14 days after grafting, experienced personnel assessed grafted seedling quality by categorizing them. The categories derived were Optimum and Acceptable for both time intervals, plus Not acceptable at 14 days after grafting. Optimum seedlings showed greater leaf area, and shoot and root fresh and dry weights at both time intervals. Moreover, they had greater stem diameter, root-to-shoot ratio, shoot dry weight-to-length ratio and Dickson’s quality index compared to the other category at 14 days after grafting. Therefore, Optimum seedlings would likely develop into marketable plants of high quality, with better establishment in the field. Not acceptable seedlings showed considerably inferior development, while Acceptable seedlings were between the other categories, but were still marketable.

ACS Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Georgios Menexes; Christodoulos Dangitsis; Damianos Kintzonidis. Assessing Quantitative Criteria for Characterization of Quality Categories for Grafted Watermelon Seedlings. Horticulturae 2019, 5, 16 .

AMA Style

Filippos Bantis, Athanasios Koukounaras, Anastasios Siomos, Georgios Menexes, Christodoulos Dangitsis, Damianos Kintzonidis. Assessing Quantitative Criteria for Characterization of Quality Categories for Grafted Watermelon Seedlings. Horticulturae. 2019; 5 (1):16.

Chicago/Turabian Style

Filippos Bantis; Athanasios Koukounaras; Anastasios Siomos; Georgios Menexes; Christodoulos Dangitsis; Damianos Kintzonidis. 2019. "Assessing Quantitative Criteria for Characterization of Quality Categories for Grafted Watermelon Seedlings." Horticulturae 5, no. 1: 16.

Original article
Published: 25 August 2018 in Indian Journal of Plant Physiology
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The effects of high boron concentration (5 mg L−1) on chlorophyll, carotenoid, carbohydrate, and mineral concentration in six non-grafted pepper cultivars (Arlequin, Imperial, Twingo, Odysseo, Salomon, and Gabryel) were studied. Salomon had the greatest chlorophyll, carbohydrate, and carotenoid concentration 14 and 35 days after the initiation of boron treatment, while Odysseo had the greatest boron concentration in the leaves (> 250 mg kg−1) compared to the other cultivars. At 14 days, Arlequin had the greatest boron concentration in the leaves, while Imperial, Twingo, Odysseo, and Salomon had intermediate levels, whereas the cv Gabryel had from 21 to 60% boron concentration of that found in Arlequin leaves. The greatest potassium and phosphorus concentrations in the leaves were recorded in the cultivar Imperial, while the concentrations of manganese and zinc in the leaves decreased depending on the cultivar. Iron concentration in the roots was 7–15 times greater than that of the leaves. These results indicate that chlorophyll, carbohydrate, carotenoid concentration and mineral composition in the leaves of peppers were significantly affected from both the duration of exposure to B toxicity and the genotype. This study depicts the genotypic variability associated with response to B toxicity. Interestingly ‘Salomon’ leaves had the greatest chlorophyll, carbohydrates and carotenoids concentration, which may affect fruit composition and yield, while ‘Odysseo’ accumulate more B in leaves and is more prone to B toxicity.

ACS Style

Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Ioannis Therios; Christos Chatzissavvidis. Boron toxicity effects on the concentration of pigments, carbohydrates and nutrient elements in six non-grafted pepper cultivars (Capsicum annuum L.). Indian Journal of Plant Physiology 2018, 23, 474 -485.

AMA Style

Eleana Sarafi, Anastasios Siomos, Pavlos Tsouvaltzis, Ioannis Therios, Christos Chatzissavvidis. Boron toxicity effects on the concentration of pigments, carbohydrates and nutrient elements in six non-grafted pepper cultivars (Capsicum annuum L.). Indian Journal of Plant Physiology. 2018; 23 (3):474-485.

Chicago/Turabian Style

Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Ioannis Therios; Christos Chatzissavvidis. 2018. "Boron toxicity effects on the concentration of pigments, carbohydrates and nutrient elements in six non-grafted pepper cultivars (Capsicum annuum L.)." Indian Journal of Plant Physiology 23, no. 3: 474-485.

Journal article
Published: 07 August 2018 in TURKISH JOURNAL OF AGRICULTURE AND FORESTRY
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Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Christos Chatzissavvidis; Ioannis Therios. Boron and maturity effects on biochemical parameters and antioxidant activity of pepper ( Capsicum annuum L.) cultivars. TURKISH JOURNAL OF AGRICULTURE AND FORESTRY 2018, 42, 237 -247.

AMA Style

Eleana Sarafi, Anastasios Siomos, Pavlos Tsouvaltzis, Christos Chatzissavvidis, Ioannis Therios. Boron and maturity effects on biochemical parameters and antioxidant activity of pepper ( Capsicum annuum L.) cultivars. TURKISH JOURNAL OF AGRICULTURE AND FORESTRY. 2018; 42 (4):237-247.

Chicago/Turabian Style

Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Christos Chatzissavvidis; Ioannis Therios. 2018. "Boron and maturity effects on biochemical parameters and antioxidant activity of pepper ( Capsicum annuum L.) cultivars." TURKISH JOURNAL OF AGRICULTURE AND FORESTRY 42, no. 4: 237-247.

Journal article
Published: 01 August 2018 in Acta Horticulturae
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ISHS II International Conference on Quality Management of Fresh Cut Produce: Convenience Food for a Tasteful Life Browning of fresh-cut lettuce as affected by preprocessing storage and heat treatments

ACS Style

A. Koukounaras; Anastasios Siomos; E. Sfakiotakis. Browning of fresh-cut lettuce as affected by preprocessing storage and heat treatments. Acta Horticulturae 2018, 321 -324.

AMA Style

A. Koukounaras, Anastasios Siomos, E. Sfakiotakis. Browning of fresh-cut lettuce as affected by preprocessing storage and heat treatments. Acta Horticulturae. 2018; (1209):321-324.

Chicago/Turabian Style

A. Koukounaras; Anastasios Siomos; E. Sfakiotakis. 2018. "Browning of fresh-cut lettuce as affected by preprocessing storage and heat treatments." Acta Horticulturae , no. 1209: 321-324.

Journal article
Published: 01 March 2018 in Scientia Horticulturae
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Anastasios Siomos. The quality of asparagus as affected by preharvest factors. Scientia Horticulturae 2018, 233, 510 -519.

AMA Style

Anastasios Siomos. The quality of asparagus as affected by preharvest factors. Scientia Horticulturae. 2018; 233 ():510-519.

Chicago/Turabian Style

Anastasios Siomos. 2018. "The quality of asparagus as affected by preharvest factors." Scientia Horticulturae 233, no. : 510-519.

Journal article
Published: 01 January 2018 in Journal of Soil Science and Plant Nutrition
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Boron may affect total uptake of various nutrients and their nutrient use efficiency (NUE) which results in high productivity and low fertilizer cost. Therefore, the objective of this study was to investigate the effect of boron concentration in nutrient solution on total uptake of the various nutrients and their utilization efficiency in pepper plants (Capsicum annuum L.). Four cultivars (Osho, Solario, Odysseo and Arlequin) were treated with 0.5-10 mg B L-1. Each treatment included five replications with 3 plants and after 20, 40 and 70 days in culture one plant per pot was removed, divided into leaves, shoots and roots and analysed. The cultivars Odysseo and Arlequin have the greatest total phosphorus absorption at 0.5-2.5 mg B L-1 and more Ca at 1-2.5 mg B L-1, while Odysseo absorbed more magnesium (Mg) per plant at 1 mg B L-1 and 70 d per plant than the other cultivars. Furthermore, Solario, Odysseo, and Arlequin absorbed at 70 days more B. Differences were recorded also among the cultivars concerning the rest of the nutrients. The maximum nutrient use efficiency of Solario and Osho for phosphorus and potassium was recorded at 5 mg B L-1, and in Solario for calcium. Boron use efficiency was maximum for Solario, Osho and Odysseo at 0.5 mg B L-1 and for Fe at 10 mg B L-1 for all the cultivars. The effect of boron on magnesium, manganese and zinc use efficiency was variable.

ACS Style

Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Ioannis Therios; Christos Chatzissavvidis. The influence of Boron on pepper plants nutritional status and nutrient efficiency. Journal of Soil Science and Plant Nutrition 2018, 1 .

AMA Style

Eleana Sarafi, Anastasios Siomos, Pavlos Tsouvaltzis, Ioannis Therios, Christos Chatzissavvidis. The influence of Boron on pepper plants nutritional status and nutrient efficiency. Journal of Soil Science and Plant Nutrition. 2018; (ahead):1.

Chicago/Turabian Style

Eleana Sarafi; Anastasios Siomos; Pavlos Tsouvaltzis; Ioannis Therios; Christos Chatzissavvidis. 2018. "The influence of Boron on pepper plants nutritional status and nutrient efficiency." Journal of Soil Science and Plant Nutrition , no. ahead: 1.

Journal article
Published: 01 December 2017 in Food Chemistry
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Increased watermelon fruit flesh firmness is systematically incurred with grafting on Cucurbita hybrid rootstocks (heterografting). Possible differences in mesocarp cell wall constitution and histology between heterografted, homeografted (self-grafted) and non-grafted watermelon were examined, as well as their contributions to fruit texture. Firmness correlated positively (r=0.78, p<0.001) with cell density (cellsmm-2) which was higher in heterografts (5.83) than homeografts (4.64) and non-grafted controls (4.69). Mean cell size was smallest in heterografts and correlated negatively (r=-0.75, p<0.001) with firmness. Cell wall material, particularly the water-insoluble pectin fractions associated with firmness, were highest in heterografts. No associations with firmness were found for cell wall neutral sugars and membrane permeability. Higher parenchymatic cell density with higher content of alcohol insoluble residue and more abundant water-insoluble pectin fractions underscore enhanced firmness in heterografts. Possible implication of osmolytes in rootstock-mediated cell pressure regulation warrants further investigation.

ACS Style

Georgios A. Soteriou; Anastasios Siomos; Dimitrios Gerasopoulos; Youssef Rouphael; Soteria Georgiadou; Marios Kyriacou. Biochemical and histological contributions to textural changes in watermelon fruit modulated by grafting. Food Chemistry 2017, 237, 133 -140.

AMA Style

Georgios A. Soteriou, Anastasios Siomos, Dimitrios Gerasopoulos, Youssef Rouphael, Soteria Georgiadou, Marios Kyriacou. Biochemical and histological contributions to textural changes in watermelon fruit modulated by grafting. Food Chemistry. 2017; 237 ():133-140.

Chicago/Turabian Style

Georgios A. Soteriou; Anastasios Siomos; Dimitrios Gerasopoulos; Youssef Rouphael; Soteria Georgiadou; Marios Kyriacou. 2017. "Biochemical and histological contributions to textural changes in watermelon fruit modulated by grafting." Food Chemistry 237, no. : 133-140.

Journal article
Published: 04 July 2017 in Journal of Food Processing and Preservation
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Fresh-cut vegetables became more and more popular due to healthy eating habits, with main problem safety of the product because of microbial spoilage as well as visual and nutritional quality changes. Ozone may act as a sanitizer; however, due to its strong oxidant activity care is needed, as in some cases, that is, if the dose being used is too high, the quality of the produce may be reduced. In this study, ozonated water at various concentrations and dipping times (0, 0.4, 0.8, or 1.2 mg/L for 0, 1, 15, or 30 s) were tested. Results revealed that application of ozonated water (0.8 mg/L for 30 s) before packaging reduced yellowing and maintained compositional characteristics of the fresh-cut spinach leaves, ensuring a shelf-life extension of 3 days. Moreover, a positive effect on microbial population control was recorded during the first 5 days of storage. The use of chlorine or other chemicals in fresh-cut industry is decreasing while alternatives treatments are proposed. Ozone even had remarkable antimicrobial action however because of its oxidation action could be negative for the horticultural products. This work investigated the efficiency of ozone treatment (concentration and dipping time) to control yellowing of fresh-cut spinach as well as the effect on microbial counts and leaves composition. The information obtained from this study provide the chance to extend the postharvest life of a highly perishable product with an alternative to chemical treatment that could be easily applied in processing line.

ACS Style

Michalis Papachristodoulou; Athanasios Koukounaras; Anastasios Siomos; Aglaia Liakou; Dimitrios Gerasopoulos. The effects of ozonated water on the microbial counts and the shelf life attributes of fresh-cut spinach. Journal of Food Processing and Preservation 2017, 42, e13404 .

AMA Style

Michalis Papachristodoulou, Athanasios Koukounaras, Anastasios Siomos, Aglaia Liakou, Dimitrios Gerasopoulos. The effects of ozonated water on the microbial counts and the shelf life attributes of fresh-cut spinach. Journal of Food Processing and Preservation. 2017; 42 (1):e13404.

Chicago/Turabian Style

Michalis Papachristodoulou; Athanasios Koukounaras; Anastasios Siomos; Aglaia Liakou; Dimitrios Gerasopoulos. 2017. "The effects of ozonated water on the microbial counts and the shelf life attributes of fresh-cut spinach." Journal of Food Processing and Preservation 42, no. 1: e13404.