Search results for "Citrus × sinensis"
showing 10 items of 39 documents
Simultaneous determination of four 5-hydroxy polymethoxyflavones by reversed-phase high performance liquid chromatography with electrochemical detect…
2009
Accumulating evidence has suggested the potential health-promoting effects of 5-hydroxy polymethoxyflavones (5-OH-PMFs) naturally existing in citrus genus. However, research efforts are hampered by the lack of reliable and sensitive methods for their determination in plant materials and biological samples. Using reversed-phase high performance liquid chromatography (HPLC) equipped with electrochemical (EC) detection, we have developed a fast and highly sensitive method for quantification of four 5-OH-PMFs, namely 5-hydroxy-6,7,8,3',4'-pentamethoxyflavone, 5-hydroxy-3,6,7,8,3',4'-hexamethoxyflavone, 5-hydroxy-6,7,4'-trimethoxyflavone, and 5-hydroxy-6,7,8,4'-tetramethoxyflavone. The method wa…
Shelter and remotely sensed night temperatures in orange groves
1991
In previous papers we have used a linear regression approach for determining nocturnal air temperature in orange groves from satellite thermal data. However, this procedure has a poor precision (≈ 2 °C) for applications such as frost forecasting. For this reason a theoretical method has been proposed, which is based on the following assumptions: (1) the air temperature (Ta) is the result of the convective heat exchange between ground and air, and between air and orange trees, and (2) the remotely-sensed temperature (T) can be expressed as a function of ground (Tg) and orange tree (Ts) temperatures. So the relationshipT = Ta + (ag − α) (Tg − Ts) has been derived, wherea = (1 +h2πR/h1L)−1 and…
Determination of the effective emissivity and temperature under vertical observation of a citrus orchard. Application to frost nowcasting
1988
Abstract In this work we use Becker's model for the determination of the effective temperature and emissivity under vertical observation of a citrus orchard. We apply this model to the particular case of a typically radiative night cooling (completely clear sky and calm wind) condition under which radiation frosts are normally produced which are damaging to the fruit and, consequently, to the Valencian economy. An attempt is made to establish a safety limit over which a frost cannot be produced. Ground and orange tree emissivity measurements were carried out by means of the box method. We were able to construct a hand-driven scanning system for the temperature measurement of the ground-oran…
In vitro anther culture of sweet orange (Citrus sinensis L. Osbeck) genotypes and of a C. clementina × C. sinensis 'Hamlin' hybrid
2014
Citrus, and particularly sweet oranges, are very recalcitrant to anther culture. In this paper it was evaluated for the first time the response of 27 genotypes of Citrus sinensis and of one hybrid C. clementina × C. sinensis, to in vitro anther culture. Ten genotypes of sweet oranges showed embryogenic callus induction, mostly blood sweet oranges genotypes, such as Tarocco, Moro and Sanguinelli. In vitro microspore developmental switches from the gamethophytic to the sporophytic pathway were shown by DAPI staining in microspores of these responsive genotypes, after 10 months in culture. However, microsatellite marker analyses showed that these calli were heterozygous. The flow-cytometric an…
Epicuticular wax content and morphology as related to ethylene and storage perfomance of 'Navelate' orange fruit
2010
8 pages, 6 figures, 1 table. -- Available online 15 September 2009.
Citrus cybrid leaf essential oil
2000
The essential oil from the leaves of a Citrus cybrid plant, obtained by somatic hybridization between ‘Valencia’ sweet orange (Citrus sinensis L. Osbeck), embryogenic parent, and ‘Femminello’ lemon (C. limon L. Burm f.), leaf parent, has been studied by steam distillation and GC–MS analysis and compared with the correspondent oils from the parent plants. Although the overall composition of the cybrid essential oil appears much closer to that of ‘Femminello’, the relatively higher percentage of β-caryophyllene, as well as the qualitative and quantitative modifications of the esteric fraction, are characteristic of the new hybrid. Since cybrid cells possess the nuclear genome of the mesophyll…
In vitro culture of albedo tissue from fruits of Citrus sinensis cv. Washington Navel: Effect of fruit age and orange juice
1994
SUMMARYCallus from citrus fruit explants has been used to study different aspects of fruit physiology. However, growth responses of callus derived from citrus fruit tissues are not always comparable with those of intact fruit; there are, for example, differences in nutritional requirements. Results with tissues cultivated in vitro seem to depend on a variety of environmental and internal factors. In the present work albedo tissue from fruits of Citrus sinensis cv. Washington Navel of different age has been used as a source of explants. The growth (fresh weight) of the calli was dependent on the age of the fruit from which the explants were taken, as well as on the addition of orange juice t…
EFFECT OF PLANT GROWTH REGULATORS AND ORANGE JUICE ON GROWTH OF CALLUS FROM FRUIT TISSUES OF WASHINGTON NAVEL ORANGE
1997
The effect of the plant growth regulators kinetin, gibberellic acid (GA3), and 2,4- dichlorophenoxyacetic acid (2,4-D), either alone or in combination with orange juice, on the in vitro growth of mesocarp and endocarp explants from 90–120 day-old Washington Navel Citrus sinensis orange fruits has been determined. Both fruit tissues formed callus. From endocarp 100% callus was formed in all cultures, even without growth regulators in the culture medium, while callus growth was lower from mesocarp. The addition of orange juice at a final concentration of 15% (v/v) to the basal medium without growth regulators increased the callus growth, specially that derived from endocarp. However, the high…
The quality of orange juice
2013
Mild processing technologies allow to obtain OJ available year-round, with characteristics closer to those of fresh orange, namely for its content in substances exhibiting free radical scavenging and antioxidant activities. These healthy components, mainly vitamin C, carotenoids and flavonoids, exhibit different absorption kinetics, bioavailability and antiradical mechanisms. Anyway, there is greater absorption of these nutrients when taken not as singly as supplements, but when consumed in minimally processed fruit, such as OJ, in which they naturally appear along with all the other biologically active phytonutrients that citrus fruits contain. Type of processing, packaging and storage con…
According to the CPLL proteome sheriffs, not all aperitifs are created equal!
2014
Combinatorial peptide ligand libraries (CPLLs) have been adopted for investigating the proteome of a popular aperitif in Northern Italy, called "Amaro Branzi", stated to be an infusion of a secret herbal mixture, of which some ingredients are declared on the label, namely Angelica officinalis, Gentiana lutea and orange peel, sweetened by a final addition of honey. In order to assess the genuineness of this commercial liqueur, we have prepared extracts of the three vegetable ingredients, assessed their proteomes, and compared them to the one found in the aperitif. The amaro's proteome was identified via prior capture with CPLLs at two different pH values (2.2 and 4.8). Via mass spectrometry …