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Improving the sensorial and nutritional quality of strawberry fruits
Full text linkNegli ultimi decenni, il consumatore è sempre più attento agli aspetti salutari della dieta, ponendo quindi particolare attenzione alla qualità generale del prodotto, dal punto di vista agronomico e commerciale fino alla qualità sensoriale e nutrizionale. Queste caratteristiche sono molto variabili tra specie differenti di fragola, ma anche all’interno di diverse cultivar appartenenti alla stessa specie. Lo scopo di questo studio triennale è stato quello di valutare e selezionare nuovi genotipi di fragola dall’elevata qualità e valore nutrizionale.
I frutti di 51 genotipi di fragola derivanti da incroci interspecifici di Fragaria virginiana glauca con Fragaria x ananassa (F1), back-crossings (BC1, BC2 e BC3), varietà e selezioni di Fragaria x ananassa (Fxa) e da selezioni di Fragaria x ananassa per uso industriale (Fxa(Ind)) sono stati analizzati per parametri produttivi, sensoriali, qualitativi e nutrizionali.
Nel programma di back-crossing sviluppato in questo studio, la scelta dei migliori genotipi come parentali per le varie generazioni di backcrossing (BC1, BC2 e BC3) ha permesso di ottenere nell’ultima generazione selezioni ricche di sostanze antiossidanti, ma anche con un buon recupero delle caratteristiche produttive e un miglioramento delle proprietà sensoriali rispetto alle precedenti generazioni di incrocio. A questo punto del processo di miglioramento genetico, è possibile affermare che i caratteri per l’elevata quantità di sostanze antiossidanti sono stati stabilizzati nel BC3, anche con un piccolo aumento rispetto alle popolazioni di Fragaria x ananassa e F1. La produzione in questo gruppo non è lontana dalle esigenze commerciali: con un ulteriore aumento del peso del frutto mediante reincrocio con un genitore (Fragaria x ananassa) dalle elevate performance produttive, alcuni genotipi di BC3 hanno il potenziale per diventare cultivar commerciali.In the last few decades, the most knowledgeable consumer on the diet and its nutritional principles pays particular attention to the overall quality assessment, comprising the agronomic/commercial quality, the organoleptic quality and the nutritional quality. All those characteristics are very variable among different species, but also among different varieties within the same species. The aim of this triennial study is to select new genotypes of strawberries with high quality and nutritional value.
Fruits of 51 strawberry selections from interspecific crossings of Fragaria virginiana glauca with Fragaria x ananassa (F1), back-crossings (BC1, BC2, BC3), varieties and advanced selections of Fragaria x ananassa (Fxa) and Fragaria x ananassa for industrial purpose (Ind) were analyzed for productive, sensorial, qualitative, and nutritional analyzes.
In the back-crossing program developed in this study, the choice of best parental genotypes for the various backcrossing generations (BC1, BC2 and BC3) allowed to obtain in the last generation, selections rich in antioxidant substances but also with a good recovery of productive characteristics, and ameliorating sensorial properties in respect to the previous crossing generations. At this point of the breeding process, it is possible to affirm that characters for the high amount of antioxidant substances were stabilized at BC3, even with a small increase in respect to both Fragaria x ananassa and F1 populations. The production in this group is not far from commercial requirements: with further increasing of the fruit weight by backcrossing with a parent (Fragaria x ananassa) with high productive characteristics, some genotypes of BC3 have the potential to become commercial cultivars
Evaluation of Vitamin C content in fruit and leaves of different strawberry genotypes
No full textVitamin C plays a critical role in the nutritional evaluation of strawberry fruit, considering that it is one of the main natural sources of this essential micronutrient. Most of the studies are done on fruit but still the variation of leaf Vitamin C content and the correlation with the fruit content is not well known. With the aim of studying this relationship, the Vitamin C content of leaf and fruit of four different strawberry cultivars (Fragaria × ananassa) were measured. The effect of daily changes was also studied by comparing leaf and fruit sampled in the morning and in the afternoon of the same picking days. The sampling was repeated in three days corresponding with the three main pickings of each cultivar. Vitamin C content was analyzed through HPLC-UV analysis. The results confirmed a variation in fruit and leaf Vitamin C content depending to the cultivars. The time of sampling in the day also influenced leaf and fruit content. The correlation studies evidenced almost an independent accumulation trend of this compound in the two plant organs. The results can be used for a better comprehension of the role of genotype and climatic conditions on the physiological pathway of production and accumulation of Vitamin C in strawberry leaves and fruits
Erratum: Corrigendum to âPhysico-chemical characteristics of thermally processed purée from different strawberry genotypesâ [J. Food Compos. Anal. (2015) 43C:106â118] (Journal of Food Composition and Analysis (****) ** (***â***))
No full textEffect of strawberry fruit phytochemical composition on color stability of thermal processed puree after long-term storage under ambient and refrigeration conditions
No full textThe key to obtain high quality processed products with improved appeal for the consumer and/or added value for new market sectors is to use raw materials with high sensorial and nutritional traits. Fruit puree is commonly treated by thermal pasteurization, although the major limitation of this treatment is the effect on the stability of the nutrients and those compounds related to aroma and colour. Flasks of processed fruit products were stored in dark at 4°C (fridge) and at 25°C (ambient). Fruit and puree sensorial (soluble solid content, pH, colorimetric index) and polyphenols nutritional parameters (total antioxidant capacity, phenol and anthocyanin contents) were analyzes before and immediately after processing (time 0) and after 30, 60, 120, 180 days of ambient and fridge storage. The data demonstrate that the genotypes with specific phytochemical compositions (high ACY and TPH content) showed greater stability for fruit colour and phenolic composition. Two cultivars ('Romina4 and 'Syria') and 2 new breeding selections (An1 and An7) showed higher stability even after 6 months of ambient storage, which represents the worst storage conditions for such a product. Puree of the same genotypes and of “Romina” showed the highest stability at fridge storage
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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