TEI of Peloponnese

Messinia, Greece

TEI of Peloponnese

Messinia, Greece
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Assimakopoulou A.,TEI of Peloponnese | Salmas I.,TEI of Peloponnese | Roussos P.A.,Agricultural University of Athens | Nifakos K.,TEI of Peloponnese | And 2 more authors.
Journal of Plant Nutrition | Year: 2017

The present work was aimed to evaluate nine Greek olive (Olea europaea L.) cultivars for tolerance to sodium chloride (NaCl) salinity, most of which have never been evaluated or considered to be extinct, in order to be used in the future as olive rootstocks in areas with salt toxicity problems.One-year old, self-rooted trees of the cultivars ‘Aetonicholia Kynourias,’ ‘Arvanitolia Serron,’ ‘Ntopia Atsicholou,’ ‘Koroneiki,’ ‘Lefkolia Serron,’ ‘Ntopia Pierias,’ ‘Petrolia Serron,’ ‘Smertolia,’ and ‘Chrysophylli’ were subjected to 0, 50, 100, and 200 mM NaCl, for six months, in nutrient solution pot experiment. The experiment was conducted as a completely randomized factorial design with four replications (of one tree), with the factors being the cultivar (nine levels) and the salt concentration (four levels). According to plant growth parameter results, ‘Arvanitolia Serron’ followed by ‘Lefkolia Serron’ were found to be the most salt tolerant cultivars to growth reduction. The same cultivars accumulated less sodium (Na) and chlorine (Cl) in the leaves by retaining more ions in the roots. Moreover, ‘Arvanitolia Serron’ was able to maintain high potassium (K) levels and K/Na ratio in younger leaves under salinity. © 2017 Taylor & Francis Group, LLC.

Roussos P.A.,Agricultural University of Athens | Assimakopoulou A.,TEI of Peloponnese | Nikoloudi A.,TEI of Peloponnese | Salmas I.,TEI of Peloponnese | And 3 more authors.
Acta Physiologiae Plantarum | Year: 2017

Nine indigenous Greek olive cultivars (‘Aetonicholia Kynourias’, ‘Arvanitolia Serron’, ‘Ntopia Atsicholou’, ‘Koroneiki’, ‘Lefkolia Serron’, ‘Ntopia Pierias’, ‘Petrolia Serron’, ‘Smertolia’ and ‘Chryssophylli’) were evaluated for their tolerance to salinity stress (four levels of sodium chloride salt, i.e., 0, 50, 100 and 200 mM) under hydroponic conditions. Their photosynthetic performance, leaf carbohydrates (mannitol, glucose, fructose and sucrose) and nutrients (nitrogen, potassium, calcium, sodium and chloride) were assessed. Photosynthetic performance was reduced under salt stress and this was mostly evident in ‘Koroneiki’ and ‘Ntopia Atsicholou’ (approximately 20% of the corresponding controls), while ‘Ntopia Pierias’, ‘Smertolia’ and ‘Petrolia Serron’ did not exhibit significant changes with salinity level. Photosynthesis (A) was reduced mainly due to severe stomatal limitations. A weak correlation was detected between A and intercellular CO2 (Ci) indicating a minor role of non-stomatal limitations. Carbohydrates in the leaves did not seem to undergo significant changes. Mannitol accumulated in ‘Chryssophylli’ leaves and glucose in ‘Arvanitolia Serron’ leaves under the highest salinity level. Potassium concentration per leaf water volume was significantly reduced (especially under the highest salinity level −45 to 60% of control). Calcium was not significantly affected although Ca/Na ratio was reduced, due to the great increase of sodium concentration. ‘Lefkolia Serron’ and ‘Arvanitolia Serron’ accumulated the least sodium in their leaves, exhibiting high K/Na ratio under the highest salinity level, indicating a better regulation of potassium influx under high sodium concentration. Based on the present data and on previous research ‘Lefkolia Serron’ and ‘Arvanitolia Serron’ are the two cultivars with the highest tolerance against salinity stress. © 2017, Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków.

Assimakopoulou A.,TEI of Peloponnese | Nifakos K.,TEI of Peloponnese | Salmas I.,TEI of Peloponnese | Kalogeropoulos P.,TEI of Peloponnese
Communications in Soil Science and Plant Analysis | Year: 2015

The effect of three sodium chloride treatments (0, 75, and 150 mM) on the growth, yield, and ion uptake of three small-sized Greek tomato cultivars (Santorini Authentic, Santorini Kaisia, and Chios) and four cherry tomato hybrids (Cherelino, Scintilla, Delicassi, and Zucchero) was studied by using a completely randomized block design with seven replicates. The results indicated that Santorini Authentic under 75 mM sodium chloride (NaCl) had reduced its total biomass production (total plant + fruits fresh weight) by only 22% while the relevant percentage decreases of some hybrids were found to be duplicated. Regarding yield characteristics, Zucchero under 75 mM NaCl, followed by Santorini Kaisia and Chios, showed the lowest reduction of the marketable total fruit fresh weight compared to Cherelino and Delicassi. The greater tolerance of Santorini Authentic might be due to the greater sodium and chlorine retention by the roots in combination with the nonsignificant decrease of the leaf potassium. Copyright © Taylor & Francis Group, LLC.

Sarigiannis Y.,University of Patras | Kapolos J.,TEI of Peloponnese | Koliadima A.,University of Patras | Tsegenidis T.,University of Patras | Karaiskakis G.,University of Patras
Food Control | Year: 2014

A three years survey was carried out by the accredited Toxin Analysis Lab of the University of Patras "ELETOX" in order to investigate the level of Ochratoxin A (OTA) in Greek retail wines. Sixty samples of different type of wines (white, rose and red), dry or sweet, from different regions of Greece (western Greece, central Greece and Thessalia) were analyzed by using immunoaffinity column for clean-up purification and HPLC/FLD for detection. From the results, 47 out of 55 samples of dry wines (white, red and rose) and 5 out of 5 samples of sweet wines (white and red) were found to be infected by OTA. The level of infection in 55 samples was below of the EU limit (2ngmL-1) while in 5 samples was exceeded that limit. More specifically, dry wines from Thessalia were contaminated with OTA ranging from 0.04 to 2.52ngmL-1 while for samples from central and western Greece the contamination level was below of 0.51ngmL-1. Finally, the findings of the present work are compared with those given in the literature. © 2014 Elsevier Ltd.

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