Search results for "Botanica"
showing 10 items of 1665 documents
Analisi dei processi di rinaturalizzazione nei vigneti e cappereti abbandonati del paesaggio terrazzato di Pantelleria (Canale di Sicilia)
2004
This study analyses the vegetation dynamics in the terrace landscape of Pantelleria Island (Sicilian Channel). The main questions were to determine the sequence of plant communities in time and to find out which environmental factors influence the course and the speed of succession. In the thermomediterranean part of the island were made vegetation relevés in five different fallow age classes, investigating three different ecological subunits: the terrace surface, the wall base and the wall in North-facing as well as in South-facing vine and caper fallows. The results show that undisturbed abandoned terraces are subject to rapid renaturation: 50 to 80 years old fallows are covered by dense …
Analisi micromorfologiche sui semi di alcune specie annuali di Astragalus (Fabaceae) e loro implicazioni nella sistematica del gruppo.
2011
Il lavoro analizza i risultati di indagini micromorfologiche su taxa annuali del genere Astragalus. Le analisi morfometriche e quelle ultrastrutturali condotte al SEM evidenziano modelli d'architettura differenti e di rilevanza tassonomica nel gruppo.
La morfologia ultrastrutturale dei semi come strumento per l'identificazione delle specie del genere Brassica (Brassicaceae)
2011
Sono presentati i risulati di uno studio micromorfologico dei semi sei taxa siciliani del genere Brassica. I dati morfometrici e l'ultrastruttura della testa dei semi al SEM ha evidenziato differenze significative tra specie e/o popolazioni da utilizzare a fini tassonomici.
Variabilità morfologica e ultrastrutturale dei semi nel gruppo di Allium cupanii (Alliaceae, Sez. Cupanioscordum)
2012
Seed germination reports of high mountain species native to Mount Etna (Sicily)
2020
The germination ability of five endemic species from the high mountain belt of Mt. Etna were studied; they are Astragalus siculus, Erysimum etnense, Senecio squalidus subsp. aethnensis, Silene italica subsp. sicula, and Tanacetum vulgare subsp. siculum. Mature seeds were collected in the field, within an elevation range of 1700–2000 m a.s.l. Different experimental conditions were tested and the best methods with optimal germination results are provided and compared for each species. First germination records are given for 4 out of 5 of the investigated taxa.
Lulwoana sp., a dark septate endophyte (DSE) in roots of Posidonia oceanica (L.) Delile seagrass
2014
Posidonia oceanica is the most common, widespread and important monocotyledon seagrass in the Mediterranean Basin, and hosts a large biodiversity of species, including microorganisms with key roles in the marine environment. In this study, we ascertain the presence of a fungal endophyte in the roots of P. oceanica growing on different substrata (rock, sand and matte) in two Sicilian marine meadows. Staining techniques on root fragments and sections, in combination with microscope observations, were used to visualise the fungal presence and determine the percentage of fungal colonisation (FC) in this tissue. In root fragments, statistical analysis of the FC showed a higher mean in roots anch…
Chemical composition and herbicidal activity of the essential oil from a Cistus ladanifer population from Spain
2012
[EN] The essential oil composition of Cistus ladanifer grown in central Spain was analysed by gas chromatography and gas chromatography/mass spectrometry, revealing it to be rich in oxygenated compounds, with trans-pinocarveol (20.00%), bornyl acetate (7.03%) and terpinen-4-ol (6.37%) as the main monoterpene compounds. Viridiflorol (13.59%) and ledol (4.36%) were the main constituents of the oxygenated sesquiterpene fraction. Large amounts of-pinene (4.70%) were found in the hydrocarbonated fractions. To study its possible use as a natural herbicide, the oil was tested invitro against Amaranthus hybridus, Portulaca oleracea, Chenopodium album, Conyza canadensis and Parietaria judaica, compl…
Chemical composition of volatile and fixed oils from of Salvia argentea L. (Lamiaceae) growing wild in Sicily.
2015
The chemical compositions of the essential oil and of the non-polar extracts (petroleum ether, dichloromethane) of the aerial parts (flowers, leaves and stems) of Salvia argentea L. were determined by GC-FID and gas chromatographyâmass spectrometry analysis. 14-Hydroxy-α-humulene (40.1%) was recognised as the main constituents of the essential oil of S. argentea, together with 1,3,8-p-menthatriene (12.1%), globulol (7.4%) and β-sesquiphellandrene (5.8%). Tritriacontane (9.9% and 14.1%), heptacosane (8.4% and 10.5%), hentriacontane (8.3% and 10.9%), tetradecanal (8.4% and 10.2%) and methyldotriacontane (7.9% and 7.6%) were recognised as the main constituents of the extracts in petroleum …