Search results for "BAC"
showing 10 items of 10211 documents
Evidence for a recent horizontal transmission and spatial spread of Wolbachia from endemic Rhagoletis cerasi (Diptera: Tephritidae) to invasive Rhago…
2013
The widespread occurrence of Wolbachia in arthropods and nematodes suggests that this intracellular, maternally inherited endosymbiont has the ability to cross species boundaries. However, direct evidence for such a horizontal transmission of Wolbachia in nature is scarce. Here, we compare the well-characterized Wolbachia infection of the European cherry fruit fly, Rhagoletis cerasi, with that of the North American eastern cherry fruit fly, Rhagoletis cingulata, recently introduced to Europe. Molecular genetic analysis of Wolbachia based on multilocus sequence typing and the Wolbachia surface protein wsp showed that all R. cingulata individuals are infected with wCin2 identical to wCer2 in …
Does catchment geodiversity foster stream biodiversity?
2019
Abstract Context One approach to maintain the resilience of biotic communities is to protect the variability of abiotic characteristics of Earth’s surface, i.e. geodiversity. In terrestrial environments, the relationship between geodiversity and biodiversity is well recognized. In streams, the abiotic properties of upstream catchments influence stream communities, but the relationships between catchment geodiversity and aquatic biodiversity have not been previously tested. Objectives The aim was to compare the effects of local environmental and catchment variables on stream biodiversity. We specifically explored the usefulness of catchment geodiversity in explaining the species richness on …
Germplasm of medicinal and aromatic plant species in the Parco della Favorita in Palermo city (Sicily, Italy)
2017
Despite high urbanization, the city of Palermo (Sicily, Italy) has a good level of plant biodiversity. The Parco della Favorita is the largest green space in the city. It covers an area of 400 ha and is the green lung of the city. The Parco della Favorita is home to many wild species of medicinal and aromatic plants (MAPs). This study aims to promote the Favorita Park as an urban green area to be used for educational purposes to raise awareness for the medicinal and food uses of MAPs. Nineteen plant species belonging to fifteen botanical families were identified. The most representative plant species were Foeniculum vulgare, Laurus nobilis, Capparis spinosa and Malva sylvetsris. Some of the…
An Agronomic Evaluation of New Safflower (Carthamus tinctorius L.) Germplasm for Seed and Oil Yields under Mediterranean Climate Conditions
2019
Interest in oilseed crops for agro-industrial research and development projects has increased in the Mediterranean area, in recent years. Safflower (Carthamus tinctorius L.) is of potential interest for agriculture mainly due to fatty acid content variability in the seed oil. The aim of this study was to assess the agronomic performance of 16 new safflower accessions together with safflower variety Montola 2000, used as a reference, in a semi-arid environment. Research was carried out in Sicily (Italy) from 2013&ndash
Characterization and conservation of Clinopodium raimondoi Spadaro, A.S. Faqi & Mazzola germplasm in the Parco della Favorita of Palermo city (Si…
2017
In urban areas, the parks represent an important source of plant biodiversity. The Parco della Favorita is the largest green area in Palermo city (Sicily, Italy). Clinopodium raimondoi Spadaro, A.S. Faqi & Mazzola is an aromatic plant species which has a range of uses in Sicilian traditional culture. The essential oil of this species is rich in terpene components and its aroma is similar to that of mint. The aim of this study was to enhance the germplasm of C. raimondoi in the Parco della Favorita. A collection-field was set up within the park. The main biometric and productive parameters of the species were determined and gas chromatographic analyses were carried out to determine the quali…
Changes in lipid composition in tobacco cells treated with cryptogein , an elicitor from Phytophthora cryptogea
1995
Abstract Changes in lipid composition occurred when tobacco cells (Nicotiana tabacum var. Xanthi) were treated with cryptogein, a proteinaceous elicitor from Phytophthora cryptogea. The most striking change was an increase in acylated steryl glycosides and steryl esters levels, certainly resulting from the glycosylation and/or esterification of free sterols. Moreover, in vivo pulse-labelling experiments with [14C]acetate also showed that a progressive decline in the incorporation rate of [14C]acetate into free sterols started with the induction of sesquiterpenoid synthesis and lasted when sesquiterpenoid synthesis stops. This phenomenon was accompanied by a significant increase in the synth…
No exception to the rule: Candidatus Portiera aleyrodidarum cell wall revisited
2014
International audience; Many insect endosymbionts described so far are gram-negative bacteria. Primary endosymbionts are obligatory bacteria usually harboured by insects inside vacuoles in specialized cells called bacteriocytes. This combination produces a typical three-membrane system with one membrane derived from the insect vacuole and the other two from the bacterial gram-negative cell envelope, composed by the cell wall (the outer membrane plus the periplasmic space) and the plasma membrane (the inner membrane). For the last 21 years, the primary endosymbiont of whiteflies 'Candidatus Portiera aleyrodidarum' was considered an exception to this rule. Previous works stated that only two …
Interspecies interactions mediated by conductive minerals in the sediments of the iron rich meromictic Lake La Cruz, Spain
2019
espanolLa laguna de La Cruz puede considerarse como un analogo biogeoquimico de los ambientes marinos en la Tierra primitiva, porque su columna de agua, muy escasa en sulfato pero rica en metano y hierro, presenta condiciones similares a estos ambientes en el Precambrico. En este ambiente encontramos que particulas conductivas establecen un acoplamiento metabolico entre clados microbianos electroactivos. Demostraremos que el sedimento anoxico de la laguna de La Cruz, rico en minerales de hierro biogeoquimicamente “reactivos”, alberga conocidas especies electroactivas tales como Geobacter y Methanothrix, ademas de otros grupos microbianos que no han sido previamente asociados con un estilo d…
Isolation and characterization of a Vitis vinifera transcription factor, VvWRKY1, and its effect on responses to fungal pathogens in transgenic tobac…
2007
International audience; Pathogen attack represents a major problem for viticulture and for agriculture in general. At present, the use of phytochemicals is more and more restrictive, and therefore it is becoming essential to control disease by having a thorough knowledge of resistance mechanisms. The present work focused on the trans-regulatory proteins potentially involved in the control of the plant defence response, the WRKY proteins. A full-length cDNA, designated VvWRKY1, was isolated from a grape berry library (Vitis vinifera L. cv. Cabernet Sauvignon). It encodes a polypeptide of 151 amino acids whose structure is characteristic of group IIc WRKY proteins. VvWRKY1 gene expression in …
Behavior of plant plasma membranes under hydrostatic pressure as monitored by fluorescent environment-sensitive probes.
2010
International audience; We monitored the behavior of plasma membrane (PM) isolated from tobacco cells (BY-2) under hydrostatic pressures up to 3.5 kbar at 30 °C, by steady-state fluorescence spectroscopy using the newly introduced environment-sensitive probe F2N12S and also Laurdan and di-4-ANEPPDHQ. The consequences of sterol depletion by methyl-β-cyclodextrin were also studied. We found that application of hydrostatic pressure led to a marked decrease of hydration as probed by F2N12S and to an increase of the generalized polarization excitation (GPex) of Laurdan. We observed that the hydration effect of sterol depletion was maximal between 1 and 1.5 kbar but was much less important at hig…