scholarly journals Quantitation of endogenous amount of ethanol, methanol and acetaldehyde in ripe fruits of different Spanish olive varieties

2020 ◽  
Vol 100 (7) ◽  
pp. 3173-3181
Author(s):  
Abdelaziz Boudebouz ◽  
Agustí Romero ◽  
Ricard Boqué ◽  
Laura Aceña ◽  
Olga Busto ◽  
...  
Keyword(s):  
Olive Varieties

scholarly journals Virus Surveys in Olive Orchards in Greece Identify Olive Virus T, a Novel Member of the Genus Tepovirus

Pathogens ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 574
Author(s):  
Evanthia Xylogianni ◽  
Paolo Margaria ◽  
Dennis Knierim ◽  
Kyriaki Sareli ◽  
Stephan Winter ◽  
...  
Keyword(s):  
High Throughput Sequencing ◽  
Leaf Roll ◽  
Virus Infections ◽  
Northern Greece ◽  
Coat Protein Region ◽  
Cherry Leaf Roll Virus ◽  
Leaf Yellowing ◽  
Olive Trees ◽  
Olive Varieties ◽  
Viral Sequences

Field surveys were conducted in Greek olive orchards from 2017 to 2020 to collect information on the sanitary status of the trees. Using a high-throughput sequencing approach, viral sequences were identified in total RNA extracts from several trees and assembled to reconstruct the complete genomes of two isolates of a new viral species of the genus Tepovirus (Betaflexiviridae), for which the name olive virus T (OlVT) is proposed. A reverse transcription–polymerase chain reaction assay was developed which detected OlVT in samples collected in olive growing regions in Central and Northern Greece, showing a virus prevalence of 4.4% in the olive trees screened. Sequences of amplified fragments from the movement–coat protein region of OlVT isolates varied from 75.64% to 99.35%. Three olive varieties (Koroneiki, Arbequina and Frantoio) were infected with OlVT via grafting to confirm a graft-transmissible agent, but virus infections remained latent. In addition, cucumber mosaic virus, olive leaf yellowing-associated virus and cherry leaf roll virus were identified.

scholarly journals Functional Traits of Olive Varieties and Their Relationship with the Tolerance Level towards Verticillium Wilt

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1079
Author(s):  
Martina Cardoni ◽  
Jesús Mercado-Blanco ◽  
Rafael Villar
Keyword(s):  
Functional Traits ◽  
Verticillium Wilt ◽  
Dry Matter ◽  
Lignin Content ◽  
Root System Architecture ◽  
Root Diameter ◽  
Matter Content ◽  
Dry Matter Content ◽  
Tolerance Level ◽  
Olive Varieties

Verticillium wilt of olive (VWO), caused by the soil-borne pathogen Verticillium dahliae, is considered one of the most important diseases affecting this tree crop. One of the best VWO management measures is the use of tolerant cultivars. Remarkably, no information is available about olive functional traits and their potential relationship with tolerance to V. dahliae. Twenty-five selected functional traits (for leaf, stem, root and whole plant) were evaluated in six olive varieties differing in their VWO tolerance level to identify possible links between this phenotype and functional traits’ variation. High intervarietal diversity was found among cultivars and several functional traits were related with VWO tolerance. Tolerant varieties showed higher leaf area, dry matter content (leaf, stem and plant) and mass fraction for stems, but lower for leaves. Significant differences were also detected for root functional traits, tolerant cultivars displaying larger fine root diameter and lignin content but smaller specific length and area of thick and fine roots. Correlations were found among functional traits both within varieties and between levels of tolerance/susceptibility to VWO. Associations were observed between biomass allocation, dry matter content and VWO tolerance. The most relevant difference between tolerant and susceptible cultivars was related to root system architecture.

Effect of Different Amounts of Winter Chilling on Fruitfulness of Several Olive Varieties

1957 ◽  
Vol 119 (2) ◽  
pp. 102-104 ◽  
Author(s):  
H. T. Hartmann ◽  
I. Porlingis
Keyword(s):  
Olive Varieties ◽  
Winter Chilling

scholarly journals Differences in the Activity of Superoxide Dismutase, Polyphenol Oxidase and Cu-Zn Content in the Fruits of Gordal and Manzanilla Olive Varieties

2002 ◽  
Vol 57 (1-2) ◽  
pp. 113-120 ◽  
Author(s):  
Dámaso Hornero-Méndez ◽  
Lourdes Gallardo-Guerrero ◽  
Manuel Jarén-Galán ◽  
María Isabel Mínguez-Mosquera
Keyword(s):  
Superoxide Dismutase ◽  
Polyphenol Oxidase ◽  
Copper Content ◽  
Redox Balance ◽  
Sod Activity ◽  
Activity Peak ◽  
Olive Variety ◽  
Zn Content ◽  
Olive Varieties ◽  
Cu And Zn

Activity of the enzymes superoxide dismutase (SOD) and polyphenol oxidase (PPO) as well as Cu-Zn content have been monitored during the thirteen weeks growth of both Gordal and Manzanilla olive variety fruits. These metalloenzymes, with Cu and Zn in the prostetic group, are involved in controlling the redox balance in the chloroplast environment. The results indicated that, under similar phenological and environmental conditions, there are periodic peaks of SOD activity in both varieties, followed by fluctuations in the copper content of the fruit. This was interpreted as a common and simultaneous response to situations of oxidative stress, and this response was more intense in the variety Gordal. The enzyme PPO showed an activity peak at start of growth and then practically disappeared. Thus, its activity cannot be correlated with situations of stress or with changes of Cu and Zn in the fruit.

scholarly journals Effect of The Date and Concentrations of The IBA on Rooting and Growth of Semi-Hard Wood Cuttings of Two Olive (Olea europaea L.) Varieties

2019 ◽  
Vol 32 ◽  
pp. 59-69
Author(s):  
Nabil M. A. Al-Imam ◽  
Qais Q. Hamid
Keyword(s):  
Landscape Design ◽  
Carbohydrate Content ◽  
Control Treatment ◽  
Subsequent Growth ◽  
College Of Agriculture ◽  
Rooted Cutting ◽  
Olea Europaea L ◽  
Rooting Ability ◽  
Olive Variety ◽  
Olive Varieties

This study was conducted in the plastic house at the Department of Horticulture and Landscape Design - College of Agriculture and Forestry - University of Mosul, Iraq. For the period from 1/2/2013 until 1/8/2013. To study the effect of three dates of cutting collection from 1st  February to 1st April monthly intervals, and soaking the cuttings in four concentrations of IBA solution 0, 2000, 3000, 4000mg.l-1 seconds on the rooting ability and subsequent growth of semi-hard wood cuttings of two olive varieties Gordal Sevillano and Tanche. The results were showed the cuttings were collected on the 1st of March resulted into the highest of rooted cutting, survival %, carbohydrate content, carbohydrate to nitrogen (C/N ratio) in the basal cuttings. Rooting increased proportionately with increasing of IBA concentrations principally the cuttings were soaked in 4000mg.l-1. Gordal Sevillano cuttings gave a significantly increase of rooting and the basal cuttings gave a significantly increased of carbohydrates content than Tanche variety. The best rooting percentage were get from interaction between Gordal Sevillano which  collected on the 1st of March treated with 4000 mg.l-1 were gave 66.67%. Highest rate of survival (80.0%) of control treatment of Tanche olive variety were taken on 1st of February. The highest content of carbohydrate (18.10) were obtained in Gordal Sevillano basal cuttings were taken on 1st of March. Higher percentage of Nitrogen (1.58%) were obtained from interaction between basal cutting of Gordal Sevillano variety. were taken on 1st of March. The highest percentage of C/N ration were got by interaction of Gordal Sevillano which collected on 1st of March.

scholarly journals Hyperspectral Reflectance as a Basis to Discriminate Olive Varieties—A Tool for Sustainable Crop Management

2020 ◽  
Vol 12 (7) ◽  
pp. 3059
Author(s):  
Luis Gomes ◽  
Tânia Nobre ◽  
Adélia Sousa ◽  
Fernando Rei ◽  
Nuno Guiomar
Keyword(s):  
Olive Oil ◽  
Environmental Sustainability ◽  
Rural Areas ◽  
Agricultural Land ◽  
Value Added ◽  
Variety Identification ◽  
Olive Variety ◽  
Mediterranean Countries ◽  
Olive Groves ◽  
Olive Varieties

Worldwide sustainable development is threatened by current agricultural land change trends, particularly by the increasing rural farmland abandonment and agricultural intensification phenomena. In Mediterranean countries, these processes are affecting especially traditional olive groves with enormous socio-economic costs to rural areas, endangering environmental sustainability and biodiversity. Traditional olive groves abandonment and intensification are clearly related to the reduction of olive oil production income, leading to reduced economic viability. Most promising strategies to boost traditional groves competitiveness—such as olive oil differentiation through adoption of protected denomination of origin labels and development of value-added olive products—rely on knowledge of the olive varieties and its specific properties that confer their uniqueness and authenticity. Given the lack of information about olive varieties on traditional groves, a feasible and inexpensive method of variety identification is required. We analyzed leaf spectral information of ten Portuguese olive varieties with a powerful data-mining approach in order to verify the ability of satellite’s hyperspectral sensors to provide an accurate olive variety identification. Our results show that these olive varieties are distinguishable by leaf reflectance information and suggest that even satellite open-source data could be used to map them. Additional advantages of olive varieties mapping were further discussed.

scholarly journals Characterization and Differentiation between Olive Varieties through Electrical Impedance Spectroscopy, Neural Networks and IoT

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5932
Author(s):  
José Miguel Madueño Luna ◽  
Antonio Madueño Luna ◽  
Rafael E. Hidalgo Fernández
Keyword(s):  
Neural Networks ◽  
Electrical Impedance ◽  
Impedance Measurement ◽  
Food Products ◽  
Electrical Impedance Spectroscopy ◽  
Optimal Harvest ◽  
Working Together ◽  
On Chip ◽  
Olive Varieties ◽  
The Internet Of Things

Electrical impedance has shown itself to be useful in measuring the properties and characteristics of agri-food products: fruit quality, moisture content, the germination capacity in seeds or the frost-resistance of fruit. In the case of olives, it has been used to determine fat content and optimal harvest time. In this paper, a system based on the System on Chip (SoC) AD5933 running a 1024-point discrete Fourier transform (DFT) to return the impedance value as a magnitude and phase and which, working together with two ADG706 analog multiplexers and an external programmable clock based on a synthesized DDS in a FPGA XC3S250E-4VQG100C, allows for the impedance measurement in agri-food products with a frequency sweep from 1 Hz to 100 kHz. This paper demonstrates how electrical impedance is affected by the temperature both in freshly picked olives and in those processed in brine and provides a way to characterize cultivars by making use of only the electrical impedance, neural networks (NN) and the Internet of Things (IoT), allowing information to be collected from the olive samples analyzed both on farms and in factories.

scholarly journals The Effect of Olive Varieties on Fatty Acid Composition and Tocopherol Contents of Cold Pressed Virgin Olive Oils

2019 ◽  
Vol 68 (4) ◽  
pp. 307-310 ◽  
Author(s):  
Mehmet Musa Özcan ◽  
Fahad Al Juhaimi ◽  
Nurhan Uslu ◽  
Kashif Ghafoor ◽  
Isam A. Mohamed Ahmed ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Olive Varieties ◽  
Cold Pressed
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