Search results for " europa"
showing 10 items of 317 documents
Comportamento agronomico ed aspetti ecofisiologici dell'olivo (olea europaea l.) in impianti superintensivi.
2011
Possible role of mannitol as an oxygen radical scavenger in olive
2011
Along with mannose and sucrose, olive produces large amounts of mannitol in photosynthesizing leaves. Leaf mannitol shows large variation among olive genotypes and Sicilian cultivars with different leaf mannitol content were used in our trials to see whether mannitol may function as an additional non-enzymatic system to protect cells from oxygen radicals and photosystem damage. In one experiment, entire shoots of 'Passulunara', 'Castriciana', 'Nocellara del Belice', and 'Moresca' olive trees were taken to a greenhouse, and mature leaves were treated with paraquat solution, which generates oxygen radicals in presence of light. After 48 hours leaves were sampled, photographed and percent of n…
Plant-based water stress sensing in two olive cultivars with different physiological responses to drought
2022
A large portion of modern olive plantings is dominated by one main cultivar (‘Arbequina’) planted at super high density (SHD, 1,500 tree ha‑1), leading to a dangerous reduction in olive biodiversity. Very few cultivars have growth and productive patterns that suit the SHD system requirements. Partial intensification and mechanization with several cultivars may represent the safest and easiest alternative. The efficient use of limited natural resources, such as water, in SHD systems, requires precise management. Continuous plant-based sensing is a promising approach to managing water, mainly tested on the cultivar ‘Arbequina’. In this study, we evaluated the sensitivity of two promising indi…
Olive Seed Wasp in Cultivated Olives. Possible threat.
2020
The possible threat to cultivated olives due to some Chalcidoidea seed wasps are here highlighted, showing symptoms, identification and seasonal occurrence
Olive seed wasps (Hymenoptera: Chalcidoidea), potentially important pests of olive crops in the Western Cape of South Africa
2019
Most phytophagous insects on cultivated olives, Olea europaea L. subsp. europaea var. europaea, in South Africa are native and come from the local wild olive tree, Olea europaea subsp. cuspidata. This paper presents the first qualitative and comparative data regarding the phytophagous seed wasps on cultivated and wild olives. From 2009 to 2012, 62 random fruit samples were collected from untreated cultivated olive trees and 53 random fruit samples from wild olives at 13 different localities in the Western Cape. During spring 2013 and summer 2014, olives collected from the trees were dissected with a scalpel (when the pit was still soft) in search of seed wasp eggs and young larvae or cut wi…
Electrophysiological and behavioural responses of the housefly to “sweet” volatiles of the flowers of Caralluma europaea (Guss.) N.E. Br.
2013
In sapromyiophilous plants, up to date, long range attraction of fly pollinators has been thoroughly investigated and attributed to ‘‘fetid’’ floral compounds, while the ‘‘sweet’’ floral scent fraction has not been spe- cifically investigated and its role has received little atten- tion. The aim of the present study was to verify if terpenoids, which are the main compounds of the floral bouquet of Caralluma europaea, play a role in the attrac- tion of its pollinator Musca domestica. Terpinolene, a- terpinene and linalool, described as the three main volatiles of the flowers of C. europaea, were evaluated in electro- physiological investigations and blends of these com- pounds as well as the…
Essential Oil Composition of Stems and Fruits of Caralluma europaea N.E.Br. (Apocynaceae)
2010
The essential oil of the stems and fruits of Caralluma europaea (Guss.) N.E.Br. (Apocynaceae) from Lampedusa Island has been obtained by hydrodistillation and its composition analyzed. The analyses allowed the identification and quantification of 74 volatile compounds, of which 16 were aromatic and 58 non-aromatic. Stems and fruits contained 1.4% and 2.7% of aromatic compounds respectively, while non-aromatic were 88.3% and 88.8%. Non-aromatic hydrocarbons were the most abundant compounds in both organs, followed by fatty acids. Data showed differences in the profiles between stems and fruits which shared only eighteen compounds; stems accounted for 38 compounds while fruits for 53. Fruits …
Buone Pratiche, Progetti e Strategie
2013
Il paesaggio della bicicletta nelle diverse realtà europee. Il progetto del paesaggio della bicicletta comprende diverse situazioni: ciclovie naturalistiche che solcano il territorio insinuandosi nei parchi, nei boschi e nei campi; alzaie o rive di fiumi e canali; tracciati urbani che ridisegnano la trama dei percorsi tradizionali e che resistono alla mobilità veicolare. In sede europea l'azione politica è concreta, mentre nel resto del mondo il tema della mobilità sostenibile è stata affrontata a diverse scale e declinato con la realizzazione di sistemi integrati urbani e di piste ciclabili.
Cooperazione Europa-Africa: aspetti storici e prospettive di sviluppo
2019
Il saggio esamina il modello di cooperazione tra Europa ed Africa comparandolo con gli altri esistenti. Individua i punti di forza e di debolezza del modello e suggerisce ipotesi per un suo miglioramento