1,720,986 research outputs found
Il nocciolo in Italia: valorizzazione del prodotto e innovazione colturale per garantire competitività
No full textIl futuro della corilicoltura italiana, in un quadro produttivo in espansione, è condizionato da scelte che prescindono dal contesto ambientale e geografico. Tuttavia interventi migliorativi lungo la filiera produttiva possono garantire maggiore stabilità e competitività al comparto, rispetto alla Turchia e ai Paesi Emergenti caratterizzati da notevoli potenzialità produttive. Il miglioramento di aspetti critici della gestione del noccioleto, come la potatura di impianti adulti e senescenti, il razionale impiego dell’irrigazione, la valorizzazione del germoplasma per ampliare la piattaforma varietale, nonché lo sviluppo di una attività vivaistica per la produzione di piante certificate, costituiscono strumenti di razionalizzazione della coltura capaci, nel contempo, di promuovere il miglioramento qualitativo del prodotto nazionale
Vanadate-sensitive activity in olive (Olea europaea L.) calli grown in the presence of auxins and cytokinins.
No full textHazelnut quality and sensory evaluation in organic and conventional growing systems
No full textConsumer acceptance of organic products requires the association of the productionsystem with directly perceivable quality attributes. Up to now, organically grown hazelnuts havebeen scarcely characterised for specific quality traits. Nuts of two Italian hazelnut cultivars,‘Tonda Gentile Romana’ and ‘Tonda di Giffoni’, grown in conventional and organic systems,were evaluated for technological traits, kernel chemical composition and sensory profile. Organicnuts showed a slightly lower oil and starch content, a lower incidence of total saturated fatty acidsand a higher content of oleic acid in comparison to conventional ones. Crude protein content inthe kernel was higher in organic nuts in ‘Tonda di Giffoni’. In both cultivars, the organic regimehas positively influenced the content of polyphenols in the kernel. Sensory evaluation revealeddifferences associated with the growing system for the attributes of colour and oiliness of roastedkernels. The organic samples were the most appreciated for both cultivars
Vanadate-sensitive activity in olive (Olea europaea L.) calli grown in the presence of auxins and cytokinins.
No full textIsolation of triploid and tetraploid olive (Olea europaea L.) plants from mixoploid cv 'Frantoio' and 'Leccino' mutants by in vivo and in vitro selection.
No full textThis paper reports a procedure for isolating triploid and tetraploid olive plants, which have not been produced before either artificially or in nature. These polyploids were isolated from two mixoploid somatic mutants obtained earlier by treating 'Frantoio' and 'Leccino' plantlets with gamma radiation. The mixoploid mutants exhibit increased thickness-of leaf, stem and root tissues, short internodes, a modified leaf lamina shape and a strong resistance to Spilocaea oleagina (Cast.) Hugh. In addition, they produce a mixture of normal drupes and some abnormally large ones, almost twice normal size. The variation in the nuclear DNA content of the mixoploid mutants is closely correlated with variation in their pollen size, crop capacity and the production of large fruit. Triploid genotypes with 69 chromosomes were isolated by germinating the seeds of these large fruits, collected from both the mixoploid mutants. Tetraploid plantlets, with 92 chromosomes, were obtained from cv. 'Frantoio' by selecting in vitro, during several proliferation phases, the shoots with obvate leaf shape which occurred among the shoots with normal lanceolate or intermediate leaf shape
Isolation and preliminary characteritation of ATPase activity from olive calli grown in media at different auxin/cytokinin ratio.
No full textATPase activity was studied in calli from olive (Olea europaea L.) petioles cultured in media modified in their auxin/cytokinin ratio in order to induce different morphogenetic responses. Addition of 0.54 μM α-naphthaleneacetic acid (NAA) or 14 μM zeatin (ZEA) did not induce any morphogenesis in calli and proton pump activity in vivo was very low, while calli produced roots at 27 or 11 μM NAA + 0.28 μM ZEA and possessed clearly detectable proton pump activity. ATPase activity associated with microsomes isolated by differential centrifugation from different callus cultures had the same pH optimum and similar sensitivity toward nitrate and azide. However, microsomes isolated from non-morphogenetic calli had higher specific ATPase activity which was very poorly (6 %) inhibited by vanadate. Also, the fractionation of these microsomes on a continuous sucrose gradient showed two peaks of ATPase activity, the more pronounced one co-purifying with the Golg i marker enzyme, Triton-stimulated UDPase activity, suggesting thus the presence of very high ATPase activity in Golgi secretory vesicles. On the contrary, ATPase activity of microsomes from calli producing roots was more sensitive to vanadate (30 - 40 % inhibition). Furthermore, the component of ATPase activity attributable to Golgi secretory vesicles was less abundant
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Micro-methods for genotypic screening of hazelnut (Corylus Avellana) seeds to accelerate breeding for seed metabolite improvement
No full textThe expression of the taste and aroma of the hazelnut seed is related to the content, amount, and relative proportion of metabolite components in the cotyledons. Therefore, for breeding purposes, it is desirable to detect those compounds at a single seed level and establish the possible association of the content of those compounds with the embryo genotype and with the alleles transmitted by the pollen, i.e. male parent. We used hazelnut full-sib (FS) seed progenies from controlled pollination for efficiency testing of a multi-micro-method procedure comprising: a generalized low reagent-cost and low amount of extracting-tissue protocol for DNA purification and SSR seed genotyping, nuclear magnetic resonance (NMR) detection of analyte spectra for phenotyping metabolite content, and in vitro culture for clonal propagation of the embryo genotype. NMR was extremely efficient to measure the amount of multiple primary and secondary cotyledonary metabolites; SSR-PCR produced neat and polymorphic DNA fragments for the tested primer set and in vitro culture gave each embryo a probability of 0.85 to germinate and to be cloned in 3-4 ramets through seedling micro-cutting propagation. These micro-methods and the results obtained by their application are now available to be integrated into breeding programs for hazelnut fruit metabolite improvement
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