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Effects of pre-harvest applications of different source of calcium on the cell wall fractions and stem bending disorder of Gerbera (Gerbera jamesonii L.) cultivar flowers
Get PDFGerbera flower belongs to the composite family and is one of the top five cut flowers in the world in terms of production and consumption, which has a great economic value in the international flowering industry. This study was designed to evaluate whether calcium pre-harvest application, provided through 0, 0.5, 1 and 1.5% of calcium chloride (CaCl2) and calcium nitrate (CaNO3), could extend the day of stem bending of gerbera cut flower. In the present study, we used two gerbera cultivars ‘Intense’ and ‘Rosaline’ as resistant and sensitive to stem bending, respectively. For evaluation of associated traits with stem bending, the produced flowers were kept in a vase solution containing 200 mg/L hydroxyquinoline with temperature conditions of 20°C. The results showed that day of stem bending of flowers extended 9.62 and 10.37 days by application of 1% CaCl2 for ‘Rosaline’ and ‘Intense’ respectively. All treatments were effective in the increasing relative water content of flower due to increase water uptake. The results also revealed that the calcium pretreatment delayed flowers senescence and increased antioxidant enzyme activity. Application of calcium resulted in an increase in membrane stability index in the cut flowers of both cultivars, providing evidence for delay of senescence in calcium-treated cut flowers. Also, results showed that calcium application significantly increased lignin, cellulose and hemicellulose content of both cultivars. The maximum and the minimum lignin and cellulose content were observed in resistant and sensitive cultivars, respectively. In general, pre-harvest application of calcium (especially 1% CaCl2) with increasing of antioxidant enzyme activity and stem lignification led to decreasing of stem bending disorder in both cultivars
Propagation of Rosa hybrida L. cv. Dolce Vita by stenting and stem cutting methods in response to different concentrations of IBA
Get PDFThis study was conducted to investigate the effect of different concentrations of Indole-3-butyric acid (IBA) in propagation of Rosa hybrida L. cultivar Dolce Vita by stenting (cutting and grafting) and stem cutting methods in greenhouse conditions. Different concentrations of IBA (0, 1500, 3000 and 4500 mg/L) were considered on Rosa hybrida L. cv. Dolce Vita grafted onto Rosa hybrida L. ‘Natal Briar’ rootstock. Then, the stentings and stem cuttings were cultured in a cocopeat + perlite (in 1:1 ratio) medium under mist system. The research was conducted as a completely randomized design with three replications. The results suggested that all IBA treatments significantly increase rooting percentage compared with the control plants, and the highest specifications of roots and shoots were observed in 1500 mg/L IBA in both methods of propagation. The results approved the superiority of stem cutting in rooting. However, the higher content of chlorophyll a, b and total were obtained in stenting method
Beneficial effects of foliar application of organic chelate fertilizers on French bean production under field conditions in a calcarous soil
Get PDFAminochelate are organic-based chelate fertilizers with higher efficiencyfor agricultural applications. In the present study, foliar application ofthree organic-based chelate fertilizers, a macro-micro mixture and soil applied NPK were evaluated on French bean growth characteristics under open field in a calcareous soil. The results showed that plant growth, pod yield (79%) and pod quality were improved by application of chelate fertilizers. Growth parameters as plant height, number of leaves and lateral shoots, shoot dry weight, pod number and pod length were significantly increased by foliar application of the chelate fertilizers. The concentrations of nitrogen, potassium and iron in pods and above all in leaves were increased by foliar application of chelate fertilizers compared to control and soil applied NPK. Pod pH and TSS were not influenced by treatments; however, foliar application of the chelate fertilizers resulted in higher titratable acidity (40%), vitamin C (112%) and protein (35%) content of pods. The results indicate that organic-based chelate fertilizers can be effective safer alternatives for simple chemical salts in calcareous soils
Combining ability and gene action of some tomato genotypes under low light condition
Get PDFLimitations in access to electricity in rural areas and substantial cost of supplemental lightning necessitate breeding as response to low light conditions. Seven inbred lines of tomato (Solanum lycopersicum L.) and their F1 hybrids, including reciprocals, developed through a 7×7 full diallel cross were evaluated under two different levels of light. Mean square for light (L) effect was significant for total yield, average fruit weight and days to first flower. Variation attributable to Genotypes and genotype × light (G×L) interaction had significant effect on all studied traits except days to ripening for which G×L interaction was not significant. Diallel analysis across two environments indicated that general (GCA), specific (SCA) and reciprocal combining ability (REC) were significant for all characters implying importance of additive and non-additive gene action along with cytoplasmic effects on genetic expression of yield, yield components and earliness. Ratio of SCA variance to SCA variance and estimates of narrow sense heritability (h2n.s) demonstrated higher weight of additive effects in inheritance of yield, fruit number and days to ripening, while indicating predominance of non-additive effects for fruit weight and early flowering. Interactions GCA×L and SCA×L were significant for almost all studied features. A particular genotype could not be recommended for all traits, but variation among genotypes in response to ambient light was promising for feasibility of plant breeding for non-optimal light intensity and duration
Comparative analysis of Volatile Compounds (potential aromatic ability) in the fruit of 15 olive Italian cultivars
Get PDFVirgin olive oils (VOOs) are characterized by peculiar flavors appreciated by the consumers all over the world. Their organoleptic characteristics depend on the aromatic properties of the fruits of the different cultivars, which will originate the final products. VOCs spectra of fifteen certified Italian olive cultivars of the University of Florence Germplasm collection, chosen as their different geographical origin, diffusion, and product purpose, were acquired using a Proton Transfer Reaction Time-of-Flight Mass Spectrometer (PTR-ToF-MS). The VOCs analyses highlighted a great variability among the fifteen cultivars, mostly due to compounds (C6 and C5) deriving from polyunsaturated fatty acids through the LOX pathway. The early identification in the olive fruit of these compounds which are considered among the major contributors to the positive VOOs attributes, would be useful to produce high quality olive oils, and get useful information to individuate the best parents for the genetic improvement.
Lo scarto visuale e il supplemento dell’immagine: le «scritture di luce» del campo di concentramento di Mauthausen
Get PDFThe aims of the present paper is to analyse the specific visual regime of some never-before-exhibited photographs displayed at the photographic exhibition organised for the 60th anniversary of the Liberation of Mauthausen camp in 2005. I will proceed accordingly to a three steps process. First of all, I will try to show how photographs can be considered as a form of writing, namely a “light writing”. I will then provide a general overview of the catalogue of the exhibition but through a decomposition and reassembly of the photographic images, trying to work for a decentralization of the gaze beyond the documentary value of these photographs. Finally, I will draw some conclusions, proposing further reflections on photography as “trace” and “supplement” of the visible.
The Icon as the Revelation of Eternity in Time
Get PDFThe essay proposes a notion of “icon” understood, according to the paradigm born of the Second Council of Nicaea (787 AD), as a visible image of the invisible qua invisible. In this light, the distinctive feature of the icon-image is its ability to manifest the paradoxical identity-difference relationship that links visible and invisible, and, consequently, representable and unrepresentable, immanence and transcendence, eternity and time. By offering itself as the privileged place for the presentation of an absence and of a “withdrawal” (the withdrawal of the invisible from the visible through the visible), the icon is distinguished in the first place by its apophatic and kenotic character. In this sense, the salient trait of the icon is its constitutive disquiet: it is founded on the “relational economy” of the image, which implies the need of an incessant articulation of the relation between visible and invisible. We can thus see in the icon the paradigm itself of “great art”: indeed, like the icon, great art is always primarily characterised by its disquiet, that is its ability to make transcendence appear in immanence, the Other of the visible appear in the visible
Istantanee. Note su «fotografia» e «tempo» a partire da La Jetée di Chris Marker
Get PDFLa Jetée (1962) is a Chris Marker movie composed by still images, photographs, with the exception of a very short sequence. The paper aims to account for the experience of temporality induced by photography, framing the structural analysis of the movie in a phenomenological horizon, in particular with regard to the Husserlian’s notion of “Living Present”.
A gloss in Semonides fr. 7.1?
Get PDFThis note deals with the much discussed opening statement of Semonides’ poem on the different types of female personality
Filodemo de Gádara, dos epigramas: traducción y comen¬tario (AP 5.131, 5.123 = 1, 14 Sider)
Get PDFIn this paper I offer a translation with a brief commentary on two epigrams of Philodemus (1 and 14 Sider). My aim is to contribute to a poetic reading of the epigrams that pays attention to the ‘whole’ and highlights the central ‘theme’ of each poem according to the artistic inten¬tions of the author