Search results for "Quercus"
showing 10 items of 125 documents
Ibridazione interspecifica nel genere Quercus L. (Fagaceae): il caso di Quercus soluntina Tin. ex Lojac.
2009
Genetic diversity in Sicilian Population of Quercus ilex (Fagaceae)
2013
The order Quercetalia virgilianae: a new proposal for the classification of semi-deciduous forests in the Mediterranean and sub-Mediterranean area.
2017
The semi-deciduous oaks belonging to Quercus pubescens s.l. group (Q. congesta C. Presl, Q. virgiliana (Ten.) Ten., Q. dalechampii Ten., Q. amplifolia Guss. and Q. leptobalanus Guss.) are widespread in the Italian Peninsula, Sicily, Sardinia and along the southern coasts of the Balkan peninsula and more generally in the whole Mediterranean area, especially in the transition zone between the temperate and Mediterranean macrobioclimate identified by the sub-mediterranean variant (Brullo et al., 1999). These forests are currently expanding rapidly because of the decreased anthropic exploitation. The syntaxonomic classification of these forest typologies is quite critical, because their florist…
Studio fitosociologico dei cerreti con agrifoglio della Sicilia
2009
Phytosociology of Quercus cerris and Ilex aquifolium woodlands in Sicily. – A vegetation survey on Quercus cerris and Ilex aquifolium woods occurring on northern side of Nebrodi Mountains, in Sicily, is presented. On phytosociolgical analyses, these fitocoenoses have been attributed to the new association Ilici aquifolii-Quercetum cerridis, within the order Doronico orientalis-Fagion sylvaticae, vicarious of Ilici-Quercetum austrothyrrenicae described from the Madonie Mountains.
New data on Protaetia (Potosia) Opaca (Coleoptera Cetoniidae) from Pantelleria island (Sicilian Channel, Italy)
2018
Gli autori segnalano la presenza di Protaetia (Potosia) opaca (Fabricius 1787) nell’isola di Pantelleria (Canale di Sicilia, Mediterraneo centrale, Italia). Essi inoltre forniscono ulteriori osservazioni tassonomiche, biologiche e sulla distrubuzione di questa specie. Protaetia (Potosia) opaca (Fabricius 1787) (Coleoptera Scarabaeoidea Cetoniidae) is here being reported for the first time from the island of Pantelleria (Sicilian Channel, Central Mediterranean Sea, Italy). Taxonomic, distribution and biological data on this species are presented.
The cork oak in the Mountains of Palermo (Italy): ecological insights from the south-eastern edge of its distribution range
2020
Abstract: The uneven presence of the cork oak (Quercus suber L.) within its distribution range is not only determined by its climatic requirements but also by specific edaphic needs. Although most of the natural populations thrive in acidic soils deriving from metamorphic or volcanic rock outcrops, some cork oak populations are found growing in soils deriving from calcareous bedrock, which are considered less suitable. We carried out a multidisciplinary investigation at the south eastern edge of the Q. suber distribution range (Mountains of Palermo, NW Sicily), including soil, floristic, and vegetation surveys, aimed at: (i) assessing the native or introduced origin of some peculiar cork oa…
Il ruolo del fico d’india nei processi di recupero spontaneo della vegetazione arborea in aree a rischio di desertificazione della Sicilia
2019
In aree sensibili al rischio di desertificazione, individuare modalità appropriate per favorire il recupero delle dinamiche evolutive naturali, e la ricostituzione di ecosistemi e cenosi forestali in equilibrio con le condizioni macroclimatiche, è di estrema importanza. A seguito dell’intenso sfruttamento antropico dei secoli passati, infatti, vaste aree interne e marginali del Mediterraneo si presentano ormai del tutto prive di copertura forestale, sono fortemente suscettibili all’innesco di diffusi processi erosivi e sono interessate da dinamiche vegetazionali regressive. Per valutare il possibile ruolo ecologico giocato dal fico d’india (Opuntia ficus-indica (L.) Mill.) nel promuovere di…
Recovery of cork forests and enhancement of by-products
2022
Cork oak (Quercus suber L.) is a tree species native to the western Mediterranean Basin (EUFORGEN 2019). Cork oak forests are human-shaped ecosystems that have to be managed to be preserved in a long-term perspective. Cork oak stands range from closed forests to open woodlands, provide high ecosystem services, mainly through cork production, support high biodiversity and provide carbon storage and water regulation services. Due to their important ecological role, these ecosystems are listed in the European Habitats Directive (Habitat 9330: Quercus suber forests, EEC, 1992). In the last years, especially in Italy, cork oak stands are undergoing a relevant regression due to the decline of tra…
Immobilisation of yeasts on oak chips or cellulose powder for use in bottle-fermented sparkling wine
2019
[EN] Sparkling wine production comprises two successive fermentations performed by Sacharomyces cerevisiae strains. This research aimed to: develop yeast immobilisation processes on two wine-compatible supports; study the effects of yeast type (IOC 18-2007 and 55A) and the immobilisation support type (oak chips and cellulose powder) on the fermentation kinetics, the deposition rate of lees and the volatile composition of the finished sparkling wine; compare the fermentation parameters of the wines inoculated with immobilised or non-immobilised cells. Proper immobilisation of yeast on oak chips and cellulose powder was demonstrated by electron microscopy. Total sugar consumption occurred in …
Short-term response to waterlogging in Quercus petraea and Quercus robur: A study of the root hydraulic responses and the transcriptional pattern of …
2015
International audience; We characterized the short-term response to waterlogging in Quercus petraea (Matt.) Liebl. and Quercus robur L. as the initial response towards their known long-term differences in tolerance to waterlogging. One-month old seedlings were subjected to hypoxic stress and leaf gas exchange, shoot water potential (Psi(s)) and root hydraulic conductivity (Lp(r)) were measured. In parallel, the expression of nine aquaporins (AQPs) along the primary root was analysed by quantitative RT-PCR. Results showed a similar reduction in net assimilation (A) and stomatal conductance (g(s)) for the two species. Notably, the response of Lpr differed temporally between the two species. Q…